2.of.3 - CDL Prep - App Air Brakes

Question 1

Question:
1. During normal driving, spring brakes are usually held back by?

• Air pressure.
• Spring pressure.
• Bolts of clamps.

Answer 1

Air pressure.

Question 2

Question:
2. Under normal conditions, in order to engage the parking brakes, the driver should?

• Apply brakes by pulling the parking brake control knob out.
• Be sure air brakes systems is fully pressurized.
• Turn off the engine.

Answer 2

Apply brakes by pulling the parking brake control knob out.

Question 3

Question:
3. With air brake vehicles, the parking brake should be used?

• Whenever you leave the vehicle unattended.
• Only during pre-trip inspections.
• As little as possible.

Answer 3

Whenever you leave the vehicle unattended.

Question 4

Question:
4. Excessive use of the service brakes results in overheating, which can lead to?

• Increase contact between the brake drums and linings.
• Expansion of the brake drums.
• Proper adjustment of S-Cam.

Answer 4

Expansion of the brake drums

Question 5

Question:
5. A straight truck or bus air brake system should not leak at the rate of more than ____ psi per minute with the engine off and the brakes released?

• 1.
• 2.
• 3.

Answer 5

2

Question 6

Question:
6. The brake pedal in an air brake system?

• Controls the air pressure applied to the brakes.
• Is connected to slack adjusters by a series of rods and linkages.
• Controls the speed of the air compressor.

Answer 6

Controls the air pressure applied to the brakes?

Question 7

Question:
7. If your truck or bus has dual parking control valves, you can use pressure from a separate tank to?

• Release the spring emergency/parking brakes to move a short distance.
• Stay parked twice as long without using up service air pressure.
• Balance the service brake system when you are parked.

Answer 7

Release the spring emergency/parking brakes to move a short distance.

Question 8

Question:
8. What happens when your brake drums very hot?

• They start to smoke.
• They contract.
• They expand.

Answer 8

They expand.

Question 9

Question:
9. The safety valve reduces pressure at ____ psi?

• 50.
• 100.
• 150.

Answer 9

150.

Question 10

Question:
10. Total stopping distance for air brakes is longer than that for hydraulic brakes due to ______ distance?

• Brake lag.
• Effective braking.
• Reaction.

Answer 10

Brake lag.

Question 11

Question:
11. The supply pressure gauge shows how much pressures?

• Is in the air tanks.
• Is going to the brake chamber.
• You have used in this trip.

Answer 11

Is in the air tanks.

Question 12

Question:
12. The most important thing to do when a low air pressure warning comes on is?

• Up-shift
• Downshift.
• Stop and safely park as soon as possible.

Answer 12

Stop and safely park as soon as possible.

Question 13

Question:
13. When brake are applied, the brake shoes will press against the?

• Brake drum or disc.
• S-Cam.
• Slack adjuster.

Answer 13

Brake drum or disc.

Question 14

Question:
14. The stop light switch?

• Turns on the brake lights when you put on the air brakes.
• Tells you when the air brake system is low on air pressure.
• Tells you when you need yo use your emergency brakes.

Answer 14

Turns on the brake lights when you put on the air brakes.

Question 15

Question:
The proper use of the brakes when going down a long steep grade after selecting a proper gear ____ below the posted speed and release your brake?

• 10 mph.
• 15 mph.
• 5 mph.

Answer 15

5 mph

Question 16

Question:
16. Why should you drain water from compressed air tanks?

• Water low boiling point reduces braking power.
• To keep from fowling the air compressor oil.
• Water can freeze in cold weather and cause brake failure.

Answer 16

Water can freeze in cold weather and cause brake failure.

Question 17

Question:
17. Your truck or bus has a dual air brake system. If a low air pressure warning comes on for only one system, what should you do?

• Reduce your speed and drive to the nearest garage for repairs.
• Reduce your speed and test the remaining system while under way.
• Stop right away and safely park. Continue only after the system is fixed.

Answer 17

Stop right away and safely park. Continue only after the system is fixed.

Question 18

Question:
18. A slack adjusted if it is more than about ________ when you pull hard on it?

• 1/4 inch.
• 1 inch.
• 1/2 inch.

Answer 18

1 inch.

Question 19

Question:
19. The use of brakes on a long and steep downgrade under normal conditions is only a supplement to?

• The use of the front brake limiting valve.
• The braking effect of the engine.
• Use of spring brakes.

Answer 19

The braking effect of the engine.

Question 20

Question:
20. If your vehicle has alcohol evaporator, it is there to?

• Boost tank pressure, the same way that turbocharges boost engine.
• Reduce the risk of icing in air brake valves in cold weather.
• Eliminate need for daily tank draining.

Answer 20

Reduce the risk of icing in air brake valves in cold weather.

Question 21

Question:
21. An air brake system is fully charged at what psi?

• 125.
• 100.
• 75.

Answer 21

125.

Question 22

Question:
22. What can legally hold a parking or emergency brake in position for a truck, truck tractor, or bus?

• Fluid pressure.
• Air pressure.
• Spring pressure.

Answer 22

Spring pressure

Question 23

The braking power of the springs brakes?

• Can only be tested by highly trained brake service people.
• Is not affected by the condition of the service brakes.
• Depends on the brakes being in adjustment.

Answer 23

Depends on the brakes being in adjustment.

Question 24

Question:
24. Air brakes takes more time than hydraulic braking because.

• Air brakes take more time to flow through the lines than hydraulic fluid.
• Air brakes require heavies return springs.
• Air brakes use different brake drums.

Answer 24

Air brakes take more time to flow through the lines than hydraulic fluid.

Question 25

Question: 25. The S-cam? - Pulls the brake shoes away from the drum and allow the wheels to roll freely. - Controls the air flow to each of the brake chambers. - Forces the brake shoes against the inside of the brake drum.

Answer 25

Forces the brake shoes against the inside of the brake drum.

Question 26

Question: 26. The driver must be able to see a low air pressure warning which comes on before pressure in the service air tanks falls below _____ psi? - 80. - 40. - 60.

Answer 26

60.

Question 27

Question: 27. The air brake lag distance at 55 mph on dry pavement adds about _____ feet? - 32. - 12. - 52.

Answer 27

32.

Question 28

Question: 28. Repeatedly partially increasing and pressing the brake pedal may result in? - A buildup of brake air pressure. - No change of brake air pressure. - A loss of brake air pressure.

Answer 28

A loss of brake air pressure.

Question 29

Question: 29. If the spring brakes are on, when should you push the brake pedal? - Only on a slippery road. - Never. - Only when driving downhill.

Answer 29

Never.

Question 30

Question: 30. Excessive heat caused by using your brakes too often can also cause? - Brake to fade or fail. - Brake linings to split up. - Modulate control valve to wear out.

Answer 30

Brake to fade or fail.

Question 31

Question: 31. If you must make an emergency stop, you should brake so you? - Use the hand brake first. - Can steer and keep your vehicle in a straight. - Can steer hard while braking hard.

Answer 31

Can steer and keep your vehicle in a straight.

Question 32

Question: 32. If your vehicle has an alcohol evaporator, every day during cold weather you should? - Check the oil for alcohol content. - Check an fill the alcohol level. - Change the alcohol from a bottle.

Answer 32

Check an fill the alcohol level.

Question 33

Question: 33. Parking or emergency brake of trucks and buses can be legally held on by _____ pressure? - Fluid. - Air. - Spring.

Answer 33

Spring.

Question 34

Question: 34. In ideal condition, a truck or bus with air brakes going at 55 mph would require the stopping distance of how many feet? - From 100 to 300 feet. - Less than 100 feet. - More than 300 feet.

Answer 34

More than 300 feet.

Question 35

Question: 35. All air brake-equipped vehicles have: - A backup hydraulic system. - An air usage gauge. - A supply pressure gauge.

Answer 35

A supply pressure gauge.

Question 36

Question: 36. The application pressure gauge shows how much air pressure you? - Are applying to the brakes. - Have in a modulating control valve. - Have in the air tanks.

Answer 36

Are applying to the brakes.

Question 37

Question: 37. The air compressor stop pumping air at what psi? - 150. - 100. - 125.

Answer 37

125.

Question 38

Question: 38. The most common type of foundation brake found on heavy vehicles is the? - Disc - Wedge drum. - S-cam drum.

Answer 38

S-cam drum.

Question 39

Question: 39. The air loss rate for a straight truck or bus with the engine off and the brakes on should not be more than? - 1 psi in 30 seconds. - 3 psi in one minute. - 2 psi in 45 seconds.

Answer 39

3 psi in one minute.

Question 40

Question: 40. It is accepted that too much heat caused by using your brakes too often can also cause? - Brake linings to split up. - Brake to fade of fail. - Modulated control valve to wear out.

Answer 40

Brake to fade of fail.

Question 41

Question: 41. The parking or emergency brake on a heavy vehicle can only be held in position by something that cannot leak away like? - Hydraulic pressure. - Spring pressure. - Air pressure.

Answer 41

Spring pressure.

Question 42

Question: 42. The driver must be able to see a low air pressure warning which comes on before pressure in the service air tanks falls below ______ psi? - 60. - 50. - 80.

Answer 42

60.

Question 43

Question: 43. Some air brake systems have an alcohol evaporator. What may happen if you don't keep the proper level of alcohol? - Ice may from in the air brake valves and cause brake failure. - The S-cam may not take back when you release the brake pedal. - Ice may form on the brake drums and wear them out.

Answer 43

Ice may from in the air brake valves and cause brake failure.

Question 44

Question: 44. If you do not have automatic thank drains, how often should you drain the oil and water from the bottom of compressed air storage thanks? - At the end of each day of driving. - After every four hours of service. - Once a week.

Answer 44

At the end of each day of driving.

Question 45

Question: 45. The air compressor governor controls? - Air pressure applied to the brakes. - When air is pumped into the air tanks. - The speed of the air compressor.

Answer 45

When air is pumped into the air tanks.

Question 46

Question: 46. It is not safe to drive a vehicle that has brake drums with cracks that are longer than _____ of the width of the friction area? - 1/8. - 1/2. - 1/4.

Answer 46

1/2.

Question 47

Question: 47. The _____ shows how much pressure is in the air thanks? - Oil gauge. - Air usage gauge. - Supply pressure gauge.

Answer 47

Supply pressure gauge.

Question 48

Question: 48. If air pressure is not built up within the correct amount of time, then? - You should be ready to use your parking brakes to stop. - Air pressure may drop to a low point while driving, requiring an emergency stop. - The alcohol container may be low.

Answer 48

Air pressure may drop to a low point while driving, requiring an emergency stop.

Question 49

Question: 49. During normal driving, spring brakes are usually held back by? - Bolts or clamps. - Spring pressure. - Air pressure.

Answer 49

Air pressure.

Question 50

Question: 50. The spring brakes used on the chambers in a straight truck will bring you to stop when air pressure drops below _____ psi? - 60. - 20. - 100.

Answer 50

20.

Question 51

Question: 51. If the air compressor should develop a leak, what keep the air in the tanks? - The one-way check valve. - The tractor protection valve. - The emergency relay valve.

Answer 51

The one-way check valve.

Question 52

Question: 52. The ________ shows how much pressure is in the air tanks? - Oil Gauge. - Air usage Gauge. - Supply pressure gauge.

Answer 52

Supply pressure gauge.

Question 53

Question: 53. If your vehicle has an alcohol evaporator, it is there to? - Eliminate the need for daily tank draining. - Boost thank pressure, the same way that turbocharges boost engine. - Reduce the risk of icing in air brake valves in cold weather.

Answer 53

Reduce the risk of icing in air brake valves in cold weather.

Question 54

Question: 54. If your truck has a properly functioning dual air brake system and minimum-size air tanks, the air pressure should build up from 85 to 100 psi within how many seconds? - 45. - 60. - 30.

Answer 54

45.

Question 55

Question: 55. The springs brakes used on the chambers in a straight truck will bring you to stop when air pressure drops below _____ psi? - 100. - 60. - 20.

Answer 55

20.

Question 56

Question: 56. The stop light switch? - Tells you when the air brake system is low on air pressure. - Tells you when you need to use your emergency brakes. - Turns on the brake lights when you put on the air brakes.

Answer 56

Turns on the brake lights when you put on the air brakes.

Question 57

Question: 57. The air compressor stops pumping air at what psi? - 125. - 100. - 150.

Answer 57

125

Question 58

Question: 58. Repeatedly partially increasing and pressing the brake pedal may result in? - A loss of brake air pressure. - No change of brake air pressure. - A buildup of brake air pressure.

Answer 58

A loss of brake air pressure.

Question 59

Question: 59. To check the free play of manual slack adjusters of S-cam brakes, you should park on? - Level ground, chock the wheels and release the parking brakes. - Level ground and drain off air pressure before checking the adjustment. - Level ground and apply the parking brakes, then apply service brakes.

Answer 59

Level ground, chock the wheels and release the parking brakes.

Question 60

Question: 60. The safety valve is set automatically? - 100. - 50. - 150.

Answer 60

150.

Question 61

Question: 61. Your truck or bus has a dual air brake system. If a low air pressure warning comes on for only one system, what should you do? - Reduce you speed and drive to the nearest garage for repairs. - Reduce your speed and test the remaining system while under way. - Stop right away and safely park. Continue only after the system is fixed.

Answer 61

Stop right away and safely park. Continue only after the system is fixed.

Question 62

Question: 62. The supply pressure gauge shows how much pressure? - Is going to the brake chamber. - You have used in this trip. - Is in the air tanks.

Answer 62

Is in the air tanks.

Question 63

Question: 63. Your truck has dual air system, and one of the system loses its pressure. What will happen? - The manual slack adjusters of the S-cam brakes will not be set properly. - Brake drums will not be fully pressurized. - Either the front or back brake will not be fully operational.

Answer 63

Either the front or back brake will not be fully operational.

Question 64

Question: 64. What air brake vehicles, the parking brakes should be used? - Any time when vehicle is parked. - To hold your speed when going downhill. - As little as possible.

Answer 64

Any time when vehicle is parked.

Question 65

Question: 65. The most common type of foundation brake found on heavy vehicles is the? - S-cam drum. - Disc. - Wedge drum.

Answer 65

S-cam drum.

Question 66

Question: 66. If your truck has a dual air brake system, and one of the system is low on pressure? - Either the front or rear brakes will not be fully functional. - The manual slack adjusters on S-cam brakes are not set properly. - The brakes drums will not be fully operational.

Answer 66

Either the front or rear brakes will not be fully functional.

Question 67

Question: 67. The braking power of the springs brakes? - Can only be tested by highly trained brake service people. - Depends on the brakes being in adjustment. - Is not affected by the condition of the service brakes.

Answer 67

Depends on the brakes being in adjustment.

Question 68

Question: 68. The air loss rate for a straight truck or bus with the engine off and the brakes on should not be more than? - 3 psi in one minute. - 2 psi in 45 seconds. - 1 psi in 30 seconds.

Answer 68

3 psi in one minute.

Question 69

Question: 69. With air brake vehicles, the parking brake should be used? - Only during pre-trip inspection. - Whenever you leave the vehicle unattended. - As little as possible.

Answer 69

Whenever you leave the vehicle unattended.

Question 70

Question: 70. If air pressure is not built up within the correct amount of time, then? - Air pressure may drop to a low point while driving, requiring an emergency stop. - The alcohol container may be low. - You should be ready to use your parking brakes to stop.

Answer 70

Air pressure may drop to a low point while driving, requiring an emergency stop.

Question 71

Question: 71. The proper use of the brakes when going down a long steep grade after selecting a proper gear is to brake until your speed is about _________ below the posted speed and release your brake? - 10 mph. - 5 mph. - 15 mph.

Answer 71

5 mph.

Question 72

Question: 72. It is not safe to drive a vehicle that has brake drums with cracks that are longer than ______ of the width of the friction area? - 1/2. - 1/4. - 1/8.

Answer 72

1/2.

Question 73

Question: 73. Your truck or bus has a dual air brake system. If a low-pressure warning comes on for only on system, what should you do? - Bring your vehicle to a complete stop right away and safely park. Continue only after the system is fixed. - Reduce your speed and drive to the nearest garage for repairs. - Reduce your speed and test the remaining system while under way.

Answer 73

Bring your vehicle to a complete stop right away and safely park. Continue only after the system is fixed.

Question 74

Question: 74. Some air brake systems have an alcohol evaporator. What may happen if you don't keep the proper level of alcohol? - The S-cam may not take back when you release the brake pedal. - Ice may form on the brake drums and wear them out. - Ice may form in the air brake valves and cause brake failure.

Answer 74

Ice may form in the air brake valves and cause brake failure.

Question 75

Question: 75. The safety valve reduces pressure at _____ psi? - 50. - 100. - 150.

Answer 75

150.

Question 76

Question: 76. The application pressure gauge shows how much air pressure you? - Are applying to the brakes. - Have in the air tanks. - Have in a modulating control valve.

Answer 76

Are applying to the brakes.

Question 77

Question: 77. If the air compressor should develop a leak, what keeps the air in the tanks? - The one-way check valve. - The tractor protection valve. - The emergency relay valve.

Answer 77

The one-way check valve.

Question 78

Question: 78. When brakes are applied, the brake shoes will press against the? - S-cam. - Slack adjuster. - Brake drum or disc.

Answer 78

Brake drum or disc.

Question 79

Question: 79. If you must make an emergency stop, you should brake so you? - Use the full power of the brakes to lock them. - Use the hand brake before the brake pedal. - Can keep your vehicle in straight line.

Answer 79

Can keep your vehicle in straight line.

Question 80

Question: 80. What happens when your brake drums get very hot? - They expand. - They start to smoke. - They contract.

Answer 80

They expand.

Question 81

Question: 81. Modern air brakes combine three different system. They are the service, the parking, and the _________ brakes? - Drum. - Emergency. - Foot.

Answer 81

Emergency.

Question 82

Question: 82. What can legally hold a parking or emergency brake in position for a truck, truck tractor, or bus? - Fluid pressure. - Air pressure. - Spring pressure.

Answer 82

Spring pressure.

Question 83

Question: 83. Air brakes takes more time than hydraulic braking because? - Air brakes require heavier return springs. - Air brakes take more time to flow through the lines than hydraulic fluid. - Air brakes use different brake drums.

Answer 83

Air brakes take more time to flow through the lines than hydraulic fluid.

Question 84

Question: 84. Why should drain water from compressed air tanks? - Water low boiling point reduces braking power. - Water can freeze in cold weather and cause brake failure. - To keep from fowling the air compressor oil.

Answer 84

Water can freeze in cold weather and cause brake failure.

Question 85

Question: 85. The most important thing to do when a low air pressure warning comes on is? - Downshift. - Stop and safely park as soon as possible. - Up-shift.

Answer 85

Stop and safely park as soon as possible.

Question 86

Question: 86. The parking or emergency brake on a heavy vehicle can only be held in position by something that cannot leak away like? - Hydraulic pressure. - Spring pressure. - Air pressure.

Answer 86

Spring pressure.

Question 87

Question: 87. IF you do not have automatic tank drains, how often should you drain the oil and water from the bottom of compressed air storage tanks? - At the end of each day of driving. - After every four hours of service. - Once a week.

Answer 87

At the end of each day of driving.

Question 88

Question: 88. If your truck or bus has dual parking control valves, you can use pressure from a separate tank to? - Balance the service brake system when you are parked. - Stay parked twice as long without using up service air pressure. - Release the spring emergency/parking brakes to move a short distance.

Answer 88

Release the spring emergency/parking brakes to move a short distance.

Question 89

Question: 89. How should you check that your service brakes are working properly? - Park on slight grade, drain off air pressure, set parking brake and check to the movement. - Park on level ground, wait until normal pressure is reached, release the parking brake and move forward slowly at about 5 mph. Then apply the brakes firmly. - Park on level ground, chock the wheels, engage the parking brakes when you have the correct amount of air pressure to do so and shut the engine off.

Answer 89

Park on level ground, wait until normal pressure is reached, release the parking brake and move forward slowly at about 5 mph. Then apply the brakes firmly.

Question 90

Question: 90. Which of these is NOT a proper time to apply the parking brakes? - If the brakes are very hot (e.g. Just after coming down a steep grade). - If you will be stopping for only one hour. - If you are going to test the parking brake to make sure that it holds the vehicle.

Answer 90

If the brakes are very hot (e.g. Just after coming down a steep grade).

Question 91

Question: 91. A slack adjuster's free play needs to be adjusted if it is more than about _________ when you pull hard on it? - 1/4 inch. - 1/2 inch. - 1 inch.

Answer 91

1 inch.

Question 92

Question: 92. Parking or emergency brakes of trucks and buses can be legally held on by ______ pressure? - Spring. - Air. - Fluid.

Answer 92

Spring.

Question 93

Question: 93. When is it OK to leave your truck unattended without applying the parking brakes and choking the wheels? - If you are conducting a pre-trip inspection. - If you are only away for a few minutes. - Never.

Answer 93

Never.

Question 94

Question: 94. Excessive heat caused by using your brakes too often can also cause? - Brake to fade or fail. - Modulated control valve to wear out. - Brake linings to split up.

Answer 94

Brake to fade or fail.

Question 95

Question: 95. The air compressor governor controls? - Air pressure applied to the brakes. - The speed of the air compressor. - When air is pumped into the air tanks.

Answer 95

When air is pumped into the air tanks.

Question 96

Question: 96. The use of brakes on a long and steep downgrade under normal conditions is only a supplement to? - Use of spring brakes. - The braking effect of the engine. - The use of the front brakes limiting valve.

Answer 96

The braking effect of the engine.

Question 97

Question: 97. Your brakes are fading when? - Less pressure is needed on the brake pedal for each stop. - You have to push harder on a brake pedal to control your speed on a downgrade. - The brake pedal feels spongy when you apply pressure.

Answer 97

You have to push harder on a brake pedal to control your speed on a downgrade.

Question 98

Question: 98. Why drain water from compressed air tanks? - Water cools the compressor too much. - Water can freeze in cold weather and cause brake failure. - Water low boiling point reduces braking power.

Answer 98

Water can freeze in cold weather and cause brake failure.

Question 99

Question: 99. An air brake system is fully charged at what psi? - 100. - 125. - 75.

Answer 99

125.

Question 100

Question: 100. The driver must be able to see a low pressure warning which comes on a before pressure in the service air tanks falls below ______ psi? - 80. - 60. - 40.

Answer 100

60.

Question 101

Question: 102. All air brake-equipped vehicles have? - A backup hydraulic system. - A supply pressure gauge. - An air usage gauge.

Answer 101

A supply pressure gauge.

Question 102

Question: 102. Under normal conditions, in order to engage the parking brakes, the driver should? - Apply brakes by pulling the parking brake control knob out. - Turn off the engine. - Be sure air brakes system is fully pressurized.

Answer 102

Apply brakes by pulling the parking brake control knob out.

Question 103

Question: 103. The driver musty be able to see a low air pressure warning which comes on before pressure in the service air tanks falls below _____ psi? - 60. - 80. - 50.

Answer 103

60.

Question 104

Question: 104. What is a "Wig Wag"? - A spring mount fir hair pieces. - A mechanical arm that signals low air pressure. - Part of the stop light system.

Answer 104

A mechanical arm that signals low air pressure.

Question 105

Question: 105. The spring brakes used on the chambers in a straight truck will bring you to a stop when air pressure drops below _______ psi? - 60. - 20. - 100.

Answer 105

20.

Question 106

Question: 106. If your vehicle has an alcohol evaporator, it is there to? - Boost tank pressure, the same way that turbocharges boost engine. - Reduced the risk of icing in air brake valves in cold weather. - Eliminate the need for daily tank draining.

Answer 106

Reduced the risk of icing in air brake valves in cold weather.

Question 107

Question: To test air service brake, you should? - Brake firmly while slowly moving forward. - Stop the vehicle, brake in a low gear, depress the service brakes, and then gently pull against the brakes. - Brake slowly while slowly moving backward.

Answer 107

Brake firmly while slowly moving forward.

Question 108

Question: 108. Stab braking? - Use light steady pressure on the brake pedal. - Press hard on brake pedal and apply the hand valve as you stop. - Apply your brakes all the way. Release the brakes when wheels lock up. As soon as the wheels start rolling, apply the brakes fully again.

Answer 108

Apply your brakes all the way. Release the brakes when wheels lock up. As soon as the wheels start rolling, apply the brakes fully again.

Question 109

Question: 109. The brakes pedal in an air brake system? - Controls the speed of the air compressor. - Is connected to slack adjusters by a series of rods and linkages. - Controls the air pressure applied to the brakes.

Answer 109

Controls the air pressure applied to the brakes.

Question 110

Question: 110. The S-cam? - Forces the brake shoes against the inside of the brake drum. - Pulls the brake shoes away from the drum and allow the wheels to roll freely. - Controls the air flow to each of the brake chambers.

Answer 110

Forces the brake shoes against the inside of the brake drum.

Question 111

Question: The air brake lad distance at 55 mph on dry pavement adds about _______ feet. - 52. - 32. - 12.

Answer 111

32.

Question 112

Question: 112. How should you check the your service brakes are working properly? - Park on level ground, wait until normal air pressure is reached, release the parking brake and move forward slowly at about 5 mph. Then apply the brakes firmly. - Park on level ground, chock the wheels, engage the parking brakes when you have the correct amount of air pressure to do so and shut the engine off. - Park on slight grade, drain off air pressure, set parking brake and check to the movement.

Answer 112

Park on level ground, wait until normal air pressure is reached, release the parking brake and move forward slowly at about 5 mph. Then apply the brakes firmly.

Question 113

Question: 113. What keeps an engine cool in hot weather while driving? - Air conditioner use. - High speed driving in order to put more air to the radiator. - Enough engine oil level.

Answer 113

Enough engine oil level.

Question 114

Question: 114. Which of these statements about vehicle fire is true? - If your engine is on fire, you should open the hood as soon as you can. - A burning tire should be cooled with water. - If cargo in a van or box trailer catches on fire, you should open the cargo door as soon as possible.

Answer 114

A burning tire should be cooled with water.

Question 115

Question: 115. What should you do before driving in the mountains? - Unhook your steering axle brake. - Know escape ramp locations on your way. - Carry the tire chains in your vehicle.

Answer 115

Know escape ramp locations on your way.

Question 116

Question: 116. The BAC (Blood Alcohol Concentration) for commercial drivers to be considered intoxicated when driving a commercial vehicle is? - 0.10. - 0.01. - 0.04.

Answer 116

0.04.

Question 117

Question: Which of these is true about radiator shutters and the winter front during winter driving? - The engine may overheat if winter-front left open. - The winter front should be closed tightly. - Ice should be removed from the radiator shutter.

Answer 117

Ice should be removed from the radiator shutter.

Question 118

Question: 118. Which of these is true about the use of drugs while driving? - Prescription or non-prescription drugs allowed if a doctor says they will not affect the driving ability. - Us of amphetamine is allowed if you are using this drug to stay alert.

Answer 118

Prescription or non-prescription drugs allowed if a doctor says they will not affect the driving ability.

Question 119

Question: 119. Which of these is true about notifying the authorities after an accident? - You should notify authorities about an accident before doing anything else. - If you have a cellular phone or CD radio you should notify the authorities before exiting the vehicle. - An exact location is not necessary just identify the road and the vehicle involved.

Answer 119

If you have a cellular phone or CD radio you should notify the authorities before exiting the vehicle.

Question 120

Question: 120. A key principle to remember about loading cargo is to keep the load? - To the rear. - To the front. - Balanced in the cargo area.

Answer 120

Balanced in the cargo area.

Question 121

Question: 121. You are driving a vehicle that could be driven safely 55 mph on an open road. But traffic is heavy, and other vehicles drive at the speed of 35 mph, though the speed limits is 55 mph. The safest speed for your vehicle is more likely to be? - 35 mph. - 55 mph. - 45 mph.

Answer 121

35 mph.

Question 122

Question: 122. Which of these lights cannot be checked at the same time? - Turn signals, brake lights, and four way flasher. - Headlights, brake lights, and clearance lights. - Turn signals, tail lights, and clearance lights.

Answer 122

Turn signals, brake lights, and four way flasher.

Question 123

Question: 123. If a straight vehicle ( not a trailer or articulation ) goes into a front-wheel skid, it will? - Go straight ahead but will turn if you turn the steering wheel. - Go straight ahead even if the steering wheels is turned. - Slid sideways and spin out.

Answer 123

Go straight ahead even if the steering wheels is turned.

Question 124

Question: 124. What is true about bad weather and driving conditions? - When the temperature drops, the bridges freeze before the road. - The road is more slippery when the rain continues than when rain begins. - Driving condition became more dangerous when temperature arises above freezing.

Answer 124

When the temperature drops, the bridges freeze before the road.

Question 125

Question: 125. Which of these statements about alcohol is NOT true? - BAC is determined by how fast you drink; how much you drink and how much you eat. - Alcohol goes directly from the stomach to the blood stream. - A drinker can control how fast his or her body absorbs alcohol.

Answer 125

A drinker can control how fast his or her body absorbs alcohol.

Question 126

Question: 126. Which of these would NOT help if the windshield is covered with ice? - Windshield scraper. - Dust brush. - Windshield defroster.

Answer 126

Dust brush.

Question 127

Question: 127. What should you do if you are unsure whether you have enough overhead clearance? - Estimate the height of topped overhead object if it is not posted. - Slow down slightly and try to drive under object. - Find another route that will not require driving under the object.

Answer 127

Find another route that will not require driving under the object.

Question 128

Question: 128. If you need to leave the road in a traffic emergency, you should? - Avoid braking until your speed has dropped to about 20 mph. - Try to get all wheels off the pavement. - Avoid shoulder because most will not support a large vehicle.

Answer 128

Avoid braking until your speed has dropped to about 20 mph.

Question 129

Question: 129. When driving at night, you should use your high beams when oncoming traffic is not within ________ feet? - 300. - 400. - 500.

Answer 129

500.

Question 130

Question: 130. If you do not have a CB-radio, what procedure should you follow on an accident scene? - Protect the area. - Notify the authorities. - Care for the injured person.

Answer 130

Protect the area.

Question 131

Question: 131. Heavy vehicles often move slower than others. Which of these is NOT a good rule to follow while driving a heavy vehicle? - Stay on the right side of the road. - Signal other drivers when it is safe to pass you. - Use four-way flasher if it is legal in your state.

Answer 131

Signal other drivers when it is safe to pass you.

Question 132

Question: 132. Which of the following systems should receive extra attention during winter weather inspection? - Exhaust. - Suspension. - Steering,

Answer 132

Exhaust.

Question 133

Question: 133. What is the term for a commercial vehicle habit of swinging wide on turns? - Off-Tracking. - Wide rounding. - Side Winding.

Answer 133

Off-Tracking.

Question 134

Question: 134. Brake drums (or discs) must not have cracks longer than ______ the width of the friction area? - 1/3. - 1/2. - 1/10.

Answer 134

1/2.

Question 135

Question: 135. Sometimes you need to leave a road to avoid a hazard or emergency. When you do, you should keep in mind that? - Most shoulder are not strong enough to support a heavy vehicle. - It is less dangerous to drive onto the shoulder than to cause a collision. - You might be unable to re-enter the road because of the gavel used on shoulders.

Answer 135

It is less dangerous to drive onto the shoulder than to cause a collision.

Question 136

Question: 136. Which of the statements about backing a heavy vehicle is NOT true? - You should back and turn toward the drivers side whenever it is possible. - You should use a helper and communicate with him with hand signals. - Because you cannot see, you should back slowly until you slightly bump into the dock.

Answer 136

Because you cannot see, you should back slowly until you slightly bump into the dock.

Question 137

Question: 137. You must stop on a hill or curve on a two-lane, two-way road. How far should you place reflective triangles? - As far back as necessary so other can see you. - Within 200 feet behind you, - Within 500 feet behind you.

Answer 137

Within 500 feet behind you.

Question 138

Question: 138. During the vehicle inspection, checking of _______ will NOT prevent a fire? - Cargo ventilation. - Electrical system isolation. - Battery fluid level.

Answer 138

Battery fluid level.

Question 139

Question: 139. Which of these statements about engine overheating is true? - You should never shut off an overheated engine until it cools. - Antifreeze is not needed when the weather is warm. - You should never remove the radiator cap on a pressurized system until the system is cooled.

Answer 139

You should never remove the radiator cap on a pressurized system until the system is cooled.

Question 140

Question: 140. The tread depth on front steering wheel tires should be? - Not less than 4/32 inch. - More than 6/32 inch. - Not less than 2/32 inch,

Answer 140

Not less than 4/32 inch.

Question 141

Question: 141. Which of these is NOT something you should do if your headlight are not working properly? - Adjust headlights. - Clean your headlights. - Leave on your high beams.

Answer 141

Leave on your high beams.

Question 142

Question: 142. Your are inspecting hydraulic brakes. You should pump the brake pedal three times, then apply firm pressure to the pedal for five seconds. If the brakes are working properly, the pedal should? - Depress slightly. - Not Move. - Sink to the floor.

Answer 142

Not Move.

Question 143

Question: 143. If you are not sure what to use to put out a hazardous material fire, you should? - Use dirt, - Wait for fire fighters. - Use water.

Answer 143

Wait for fire fighters.

Question 144

Question: 144. Your vehicle has hydraulic brakes. While traveling on a level road, you press the brake pedal and find that it goes to the floor. Which of these statements is true? - The parking brake will not work either because it is part if the same hydraulic system. - Pumping the brake pedal may bring the pressure up so you can stop the vehicle. - Shifting into neutral will help to slow the vehicle.

Answer 144

Pumping the brake pedal may bring the pressure up so you can stop the vehicle.

Question 145

Question: 145. After starting the engine? - The engine temperature gauge will take 3-5 minutes to rise to normal. - The coolant temperature gauge should begin a gradual rise to normal. - The oil pressure gauge should take 3-5 minutes to rise to normal.

Answer 145

The coolant temperature gauge should begin a gradual rise to normal.

Question 146

Question: 146. You are driving a 40-foot vehicle at 35 mph. The road is dry, and visibility is good. What is the least amount of space you should keep in front of your vehicle to be safe? - 5 seconds. - 3 seconds. - 4 seconds.

Answer 146

4 seconds.

Question 147

Question: 147. You are checking your brakes and suspension system for a pre-trip inspection. Which of these statements is true? - Brake shoes should not have oil, grease, or brake fluid on them. - Just one missing leaf in a leaf spring is not dangerous. - Spring hangers that are cracked but still tight are not dangerous.

Answer 147

Brake shoes should not have oil, grease, or brake fluid on them.

Question 148

Question: 148. When driving through the work zone, you should? - Watch for sharp pavement drop off. - Reduce your speed only if workers are close the roadway. - Turn on your parking lights.

Answer 148

Watch for sharp pavement drop off.

Question 149

Question: 149. Hydroplaning? - Is more likely if tire pressure is low. - Cannot occur when driving through a puddle. - Only occurs when there is a lot of water.

Answer 149

Is more likely if tire pressure is low.

Question 150

Question: 150. You are traveling down a long, steep hill. Your brakes get so hot that they have failed. What should you do? - Downshift and pump the brake pedal. - Look for an escape ramp or escape route. - BOTH

Answer 150

Look for an escape ramp or escape route.

Question 151

Question: 151. You may hang up on a railroad track if? - You try to shift gear when crossing. - The tracks have a sleep approach. - If you cross the double tracks too slowly.

Answer 151

The tracks have a sleep approach.

Question 152

Question: 152. If you are being tailgated, you should? - Flash your brake lights. - Increase your following distance. - Signal the tailgater when it is safe to pass you.

Answer 152

Increase your following distance.

Question 153

Question: 154. You are driving on a two-lane road. An oncoming driver drifts into your lane and is headed straight for you. Which of these is most often the best action to take? - Hard braking. - Steer onto the left shoulder. - Steer to the right.

Answer 153

Steer to the right.

Question 154

Question: 155. The best drivers are those who watch and prepare for hazards. This is called _______ driving? - Objective. - Offensive. - Defensive.

Answer 154

Defensive.

Question 155

Question: 155. Which of these is NOT a danger when an automatic transmission is forced into a low gear at a high speed? - Damage to the transmission. - A loss of steering control. - A loss of engine braking effect.

Answer 155

A loss of steering control.

Question 156

Question: 156. Which of these is the most important thing to remember about emergency braking? - Disconnecting the steering axle brakes will keep your vehicle in a straight-line during emergency braking. - If the wheels are skidding, you cannot control your vehicle. - Never do it without downshifting first.

Answer 156

If the wheels are skidding, you cannot control your vehicle.

Question 157

Question: 157. What should you do when you see a hazard in the roadway ahead of you? - Stop quickly and pull to the side of the road. - Steer around it and get back in your lane. - Use your four-way flashers or brake lights to warn others.

Answer 157

Use your four-way flashers or brake lights to warn others.

Question 158

Question: 158. Extra care is needed to keep your Vehicle centered in your lane because commercial vehicles? - Tend to sway from time to time. - Require a lot of room to change lane. - Are often wider than other vehicles.

Answer 158

Are often wider than other vehicles.

Question 159

Question: 159. How does the weight of the vehicle affect stopping distance? - Fully loaded trucks take longer to stop, or the buses loaded with passengers take less distance than empty ones. - If brakes work weight will have no effect on stopping distance. - Empty trucks take longer to stop than if loaded but this is not the normal case for buses.

Answer 159

Empty trucks take longer to stop than if loaded but this is not the normal case for buses.

Question 160

Question: 160. A Hazard? - Cannot turn into emergency. - Does not need to be seen. - Is any road condition or other road user that is possible danger.

Answer 160

Is any road condition or other road user that is possible danger.

Question 161

Question: 161. Which of the statements about driving in areas with strong wind is true? - The lighter your vehicle, the less trouble you will have with the wind. - Winds are especially a problem when coming out of tunnels. - You should drive alongside other vehicles to help brake up the wind,

Answer 161

Winds are especially a problem when coming out of tunnels.

Question 162

Question: 162. Which of these is a good thing to do when driving at night? - Look directly at the oncoming headlights only briefly. - Keep your speed slow enough that you can stop within the range of your headlights. - Keep your instrument lights bright.

Answer 162

Keep your speed slow enough that you can stop within the range of your headlights.

Question 163

Question: 163. Which of these is true about tires and how weather? - A small amount of air could be let out, but air pressure remains stable. - You should inspect your tires every two hour or every 100 miles when driving in very hot weather. - If a tire is too hot to touch, you should drive on it to cool it off.

Answer 163

You should inspect your tires every two hour or every 100 miles when driving in very hot weather.

Question 164

Question: 164. What is the proper way to hold a steering wheel? - With both hands close together, near the top of the wheel. - With both hands, on opposite sides of the wheel. - With both hands close together near the bottom of the wheel.

Answer 164

With both hands, on opposite sides of the wheel.

Question 165

Question: 165. The bridge formula? - Permits the same maximum axle weight for any axle. - Permits less maximum axle weight for axles that are closer together. - Permits less maximum axle weight for the axles that are far apart.

Answer 165

Permits less maximum axle weight for axles that are closer together.

Question 166

Question: 166. Controlled braking is? - Squeezing the brakes firmly without locking them up. - Slamming on the brakes hard and making wheels lock up. - Pressing brakes until wheel lock-up occurs, releasing and then reapplying.

Answer 166

Squeezing the brakes firmly without locking them up.

Question 167

Question: 167. You must stop on a hill or curve on a two-lane, two-way road. How far should you place reflective triangles? - Within 200 feet behind you. - As far back as necessary so others can see you. - Within 500 feet behind you.

Answer 167

Within 500 feet behind you.

Question 168

Question: 168. If you are not sure what to use to put out a hazardous material fire, you should? - Use Dirt. - Use water - Wait for fire fighters.

Answer 168

Wait for fire fighters.

Question 169

Question: 169. You are checking your tires for a pre-trip inspection. Which of these statement is true? - 2/32-inch trad depth is safe for front tires. - Redial and bias-ply tires can be used together on the same vehicle. - Tires of mismatched sizes should not be used together in the same vehicle.

Answer 169

Tires of mismatched sizes should not be used together in the same vehicle.

Question 170

Question: 170. Which of these statement about the hazardous vehicle fire is true? - Poor cargo ventilation may cause cargo to catch on fire. - Under inflated tires cannot cause a vehicle fire. - Carrying a fully charged fire extinguisher may prevent a fire.

Answer 170

Poor cargo ventilation may cause cargo to catch on fire.

Question 171

Question: 171. What should you do when your vehicle hydroplanes? - Accelerate slightly. - Start stab braking. - Release accelerator.

Answer 171

Release accelerator.

Question 172

Question: 172. What is the term for a commercial vehicle habit of swinging wide on turns? - Side Winding. - Wide rounding. - Off-Tracking.

Answer 172

Off-Tracking.

Question 173

Question: 173. Which of these statements about acceleration is true? - When traction is poor, more power should be applied to the accelerator. - Rough acceleration can cause mechanical damage. - You should feel a jerking motion if you accelerate your vehicle properly.

Answer 173

Rough acceleration can cause mechanical damage.

Question 174

Question: 174. If your brakes fail on a downgrade you must first? - Look outside your vehicle for another means of slowing you. - Find an escape ramp in order to exit the roadway. - Hit some object in order to stop your vehicle.

Answer 174

Look outside your vehicle for another means of slowing you.

Question 175

Question: 175. Which of these is correct about emergency or evasive action? - You can stop more quickly than you can turn to miss obstacles. - Stopping is always the safest thing to do in a traffic emergency. - In order to turn quickly you must have a firm grip on the steering wheel.

Answer 175

In order to turn quickly you must have a firm grip on the steering wheel.

Question 176

Question: 176. Can state inspectors inspect your truck or bus? - Yes and they can put you out of service if unsafe. - No. - Yes, but cannot put you out of service.

Answer 176

Yes and they can put you out of service if unsafe.

Question 177

Question: 178. According to the drivers manual, why should you limit the use of your horn? - It can startle other drivers. - The horn is not a good way to let others know you are there. - You should always keep firm grip on the steering wheel with both hands.

Answer 177

It can startle other drivers.

Question 178

Question: 178. You will be placed out of service for 24 hours if your blood alcohol concentration (BAC) is at least? - 0.02 - 0.04 - Any detectable amount.

Answer 178

Any detectable amount.

Question 179

Question: 179. Your vehicle will be pout out of service if _______ or more leaves in any leaf spring are missing? - 1/3. - 1/4. - 1/2.

Answer 179

1/4.

Question 180

Question: 180. Which of these is true about hauling hazardous materials? - Containers should be marked with four-inch diamond-shaped hazard labels. - Cylinders with compressed gasses should be transported under covers if there is no label on them. - Such a load should be marked with a four-inch circle, red colored labels on the containers.

Answer 180

Containers should be marked with four-inch diamond-shaped hazard labels.

Question 181

Question: 181. The distance that you should look ahead of your vehicle while driving is about ________ at low speeds? - 2 blocks. - 1 block. - 1/2 block.

Answer 181

1 block.

Question 182

Question: 182. If you have to make a vehicle inspection report, you must sign it? - Only when defects are noted that are certified to not need repair. - When any defects are noted whether they are certified to be repaired or not. - Only when defect are noted that are certified to be repaired.

Answer 182

When any defects are noted whether they are certified to be repaired or not.

Question 183

Question: 183. What does emergency braking mean? - Responding to a hazarding by slowing the vehicle. - Using the vehicle emergency brakes. - Pushing down the brake pedal as hard as you can.

Answer 183

Responding to a hazarding by slowing the vehicle.

Question 184

Question: 184. What keep an engine cool in hot weather while driving? - Enough engine oil level. - Air conditioner use. - High speed driving in order to put more air to the radiator.

Answer 184

Enough engine oil level.

Question 185

Question: 185. Which of these is not required knowledge for drivers seeking a hazardous material endorsement? - Which products can be loaded together. - Basic chemistry. - When to use the placards.

Answer 185

Basic chemistry.

Question 186

Question: 186. Retarders? - Can cause the driver wheels to skid when they have poor traction. - Work when you apply the brake pedal. - Cause extra brake wear.

Answer 186

Can cause the driver wheels to skid when they have poor traction.

Question 187

Question: 187. You are driving a 40-foot vehicle at 55 mph. The road is dry, and visibility is good. What is the lease amount of space that you need to have in front of your vehicle? - 6 seconds. - 5 seconds. - 4 seconds

Answer 187

5 seconds.

Question 188

Question: 188. When you are driving in an area with few streetlights. If you cannot see well with your headlights, which of the actions may help? - Turn your interior lights on and adjust your instruments lights. - Find another route that is better lit even if it is out of your way. - Use your high beams when legal and keep your interior lights off.

Answer 188

Use your high beams when legal and keep your interior lights off.

Question 189

Question: 189. To avoid an accident, you moved to the shoulder. The shoulder is clear; you should? - Ride on shoulder to the next exit and then re-enter the road. - Stay on shoulder until your vehicle has come to a stop. - Using mirrors and turn signals, turn sharply to get back to the road.

Answer 189

Stay on shoulder until your vehicle has come to a stop.

Question 190

Question: 190. Which of these is true about proper use of a steering wheel? - If you have reached a cruising speed on a highway you can drive with one hand. - Only with attempt of difficult turn use both hands on the wheel. - If you do not hold a wheel with both hands it could pull away from you.

Answer 190

If you do not hold a wheel with both hands it could pull away from you.

Question 191

Question: 191. A Hazard? - Does not need to be seen. - Cannot turn into emergency. - Is any road condition or other road user that is possible danger.

Answer 191

Is any road condition or other road user that is possible danger.

Question 192

Question: 192. When you are starting to move up a hill from a stop? - Keep the trailer brake hand valve applied until you reach 20 mph. - Release the parking brakes as you apply engine power. - Engage the clutch and accelerate quickly.

Answer 192

Release the parking brakes as you apply engine power.

Question 193

Question: 193. The driver's manual suggests several things to do when you pass a vehicle. Which of these is NOT one of them? - Lightly tap your horn. - At night, turn on your high beams before you start to pass and leave them on until you have completely passed the vehicle. - Assume that another driver does not see you.

Answer 193

At night, turn on your high beams before you start to pass and leave them on until you have completely passed the vehicle.

Question 194

Question: 194. What three distance build up the total stopping distance of your truck or bus? - Respond distance, observation distance, and braking distance. - Perception distance, reaction distance, and braking distance. - Attention distance, reaction distance, and slowing distance.

Answer 194

Perception distance, reaction distance, and braking distance.

Question 195

Question: 195. How do you correct a drive-wheel acceleration skid? - Downshift. - Stop accelerating. - Apply more power to the wheels.

Answer 195

Stop accelerating.

Question 196

Question: 196. You are driving a heavy vehicle. You must exit a highway using an off-ramp that curves downhill. You should? - Slow to the posted speed limit for the off-ramp. - Slow down to a safe speed before the turn. - Slow down to 15 mph below the posted speed limit.

Answer 196

Slow down to a safe speed before the turn.

Question 197

Question: 197. The distance that you should look ahead of your vehicle while driving amounts to about ______ miles at normal highway speed? - 1/4. - 1/2. - 1/8.

Answer 197

1/4.

Question 198

Question: 198. Hydroplaning? - Only occurs when there is a lost of water. - Cannot occur when driving through a puddle. - Is more likely if tire pressure is low.

Answer 198

Is more likely if tire pressure is low.

Question 199

Question: 199. What happens to tar on the road pavement during hot weather? - Nothing. - It bleeds making the road surface slippery. - It becomes staining making tires stick to the road.

Answer 199

It bleeds making the road surface slippery.

Question 200

Question: 200. The purpose of the retarders is to? - Help slow the vehicle while driving and reduce brake wear. - Apply extra braking power to the non-drive axles. - Help prevents skids.

Answer 200

Help slow the vehicle while driving and reduce brake wear.

Question 201

Question: 201. Freeway exits can be dangerous for commercial vehicles. At what speed should you enter the exit? - Whatever speed you feel comfortable with. - At the posted speed. - Below the posted speed limit.

Answer 201

Below the posted speed limit.

Question 202

Question: 202. Backing of the commercial vehicle is? - Not dangerous if you have a helper. - Not dangerous if you don't have to turn. - Always dangerous.

Answer 202

Always dangerous.

Question 203

Question: 203. The center of gravity of a load? - Is only a problem if the vehicle is overloaded. - Should be kept as nigh as possible. - Can make a vehicle more likely to tip over on curves if it is high.

Answer 203

Can make a vehicle more likely to tip over on curves if it is high.

Question 204

Question: 204. How far should a driver look ahead of the vehicle while driving? - 12-15 seconds. - 5-8 seconds. - 18-21 seconds.

Answer 204

12-15 seconds.

Question 205

Question: 205. When should you test parking brakes? - While the vehicle is parked. - While moving at a very low speed. - When backing.

Answer 205

While the vehicle is parked.

Question 206

Question: 206. If you are stopped at a roadside rest area and found to have a BAC (Blood Alcohol Concentration) of 0.02, you will? - Be placed out of service for 72 hours. - Be in deep trouble with your dispatcher. - Be placed out of service for 24 hours.

Answer 206

Be placed out of service for 24 hours.

Question 207

Question: 207. What negatively affects the braking power of s spring brake? - The brake are not being adjusted properly. - Nothing affects the power of spring brakes negatively. - The air compressor governor.

Answer 207

The brake are not being adjusted properly.

Question 208

Question: 208. Pressing and releasing the brake pedal unnecessarily _______? - Is good in-cab exercise. - Is not a concern at all. - Can cause air pressure to get to low and the brakes to stop working.

Answer 208

Can cause air pressure to get to low and the brakes to stop working.

Question 209

Question: 209. Brake linings should NOT be _____? - All of these. - Soaked with oil or grease. - Thin.

Answer 209

All of these.

Question 210

Question: 210. An air brake system is fully charged at what psi? - 75. - 125. - 100.

Answer 210

125.

Question 211

Question: 211. When driving an older vehicle that has a manual front brake limiting valve, drivers should _____? - Not even drive that vehicle. - Keep the control in "normal" position. - Use it only in slippery weather. - Drive less than 55 mph.

Answer 211

Keep the control in "normal" position.

Question 212

Question: 212. If the air compressor should develop a leak, what keeps the air in the tanks? - The emergency relay valve. - The one-way check valve. - The tractor protection valve.

Answer 212

The one-way check valve.

Question 213

Question: 213. Why should air tanks be drained completely? - To expel surplus air. - Air tanks should not be drained completely. - None of the listed answers. - Because compressed air typically consists of water and some oil, which can be bad for the air brake system.

Answer 213

Because compressed air typically consists of water and some oil, which can be bad for the air brake system.

Question 214

Question: 214. Pushing the brake pedal down harder _______? - Applies more air pressure. - Reduces the air pressure. - Does nothing.

Answer 214

Applies more air pressure.

Question 215

Question: 215. Spring brakes will come on automatically, but the parking brake can also be applied _______? - Only while stopped. - With an in-cab control. - By getting out and adjusting the brakes.

Answer 215

With an in-cab control.

Question 216

Question: 216. Air tanks need to be drained? - To keep sludge from clogging the brake system. - At the end of each day of driving. - All of the listed answers.

Answer 216

All of the listed answers.

Question 217

Question: 217. Automatic adjuster should? - Not have to be manually adjusted. - Only be adjusted manually during installation of the slack adjusters. - Not have to be adjusted manually except when you are performing maintenance on the brakes and during installation of the slack adjusters.

Answer 217

Not have to be adjusted manually except when you are performing maintenance on the brakes and during installation of the slack adjusters.

Question 218

Question: 218. Vehicles with air brakes have pressure gauges connected to the _______? - Alcohol evaporator. - None of the listed answers. - Air tanks.

Answer 218

Air tanks.

Question 219

Question: 219. A mechanical device that drop a low air warning into a drivers view is called a _______? - Zim zam. - Jig jag. - Wig wag.

Answer 219

Wig wag.

Question 220

Question: 220. When it it OK to leave your unattended without applying the parking brakes and chocking the wheels? - If you are only away for a few minutes. - If you are conducting a pre-trip inspection. - Never.

Answer 220

Never.

Question 221

Question: 221. If your truck has a properly functioning dual air brakes system and minimum size air tanks, the air pressure should build up from 85 to 100 psi within how many seconds? - 60. - 30. - 45.

Answer 221

45.

Question 222

Question: 222. What does ABS stand for? - Antilock braking system. - Airlock brake source. - Anti brake source.

Answer 222

Antilock braking system.

Question 223

Question: 223. Brake drums (or discs) must not have cracks longer then ____________ the width of the friction area. - 1/2. - 1/10. - 1/3.

Answer 223

1/2.

Question 224

Question: 224. How should the air leaks rate be tested? - Pumping the brake pedal when the air pressure has dropped below 60 psi. - Turning off the engine, release the parking brake and timing the air pressure drop. - None of these.

Answer 224

Turning off the engine, release the parking brake and timing the air pressure drop.

Question 225

Question: 225. In tractors and straight trucks, spring brakes will come on fully when the air pressure drops to what range? - 45-55 psi. - 60-75 psi. - 50-55 psi. - 20-45 psi.

Answer 225

20-45 psi.

Question 226

Question: 226. The spring brakes used on the chambers in a straight truck will bring you to a stop when air pressure drops below ______ psi? - 20. - 100. - 60.

Answer 226

20.

Question 227

Question: 227. To test the parking brake, stop the vehicle, put the parking brake on, and ______? - Have another truck push from behind. - Pull against it in low gear and high RPM's. - Gently pull against it in a low gear.

Answer 227

Gently pull against it in a low gear.

Question 228

Question: 228. If your vehicle has an alcohol evaporator, it is there to ____________? - Boost tank pressure, the same way that turbocharges boost engine. - Reduce the risk of icing in air brake valves in cold weather. - Eliminate the need for daily tank draining.

Answer 228

Reduce the risk of icing in air brake valves in cold weather.

Question 229

Question: 229. While applying the brakes, what tells the driver how much air pressure is being used? - Front brake limiting valve. - Supply pressure gauge. - Application pressure gauge.

Answer 229

Application pressure gauge.

Question 230

Question: 230. Air governor cut-out should be at around? - 100 psi. - 125 psi. - 40 psi.

Answer 230

125 psi.

Question 231

Question: 231. The air compressor is connected to the engine through? - None of the listed answers. - A very short tube. - Gears.

Answer 231

Gears.

Question 232

Question: 232. The parking brake should not be used when wet in freezing temperatures, or _____? - First thing in the morning. - On flat ground. - If the brakes are very hot.

Answer 232

if the brakes are very hot.

Question 233

Question: 233. The safety valve is set automatically when pressure is __________? - 150 psi. - 100 psi. - 50 psi.

Answer 233

150 psi.

Question 234

Question: 234. When checking the air pressure buildup, pressure should build? - To 125 psi. - To 85 psi. - From 85 to 100 psi.

Answer 234

From 85 to 100 psi.

Question 235

Question: 235. The driver must be able to see a low air pressure warning which comes on before pressure in the service air tanks fall below __________ psi? - 40. - 80. - 60.

Answer 235

60.

Question 236

Question: 236. Why does a heavily loaded vehicle need a longer distance to stop? - None of the listed answers. - Because the spring brakes work on all axles. - Because the spring brakes do not work on all axles.

Answer 236

Because the spring brakes do not work on all axles.

Question 237

Question: 237. On a long or steep downgrade, the foot brakes should be used ______? - Sparingly and intermittently. - As the only method of controlling speed. - None of these answers.

Answer 237

Sparingly and intermittently.

Question 238

Question: 238. To prevent too much pressure from building up in the system, what installed? - Air tank drain. - Supply pressure gauge. - Safety valve.

Answer 238

Safety Valve.

Question 239

Question: 239. If air pressure is not built up within the correct amount of time, then ________? - You should be ready to use your parking brakes to stop. - Air pressure may drop to a low point while driving, requiring an emergency stop.

Answer 239

Air pressure may drop to a low point while driving, requiring an emergency stop.

Question 240

Question: 240. What happens when your brake drums get very hot? - They contract. - They start to smoke. - They expand.

Answer 240

They expand.

Question 241

Question: 241. A low pressure warning signal could be ____________? - A buzzer. - A wig wag mechanical arm. - All of the listed answers.

Answer 241

All of the listed answers.

Question 242

Question: 242. After the initial pressure drop, air leakage for signal vehicles should be less than _____________? - 2 psi in 1 minute. - 1 psi in 2 minutes. - 4 psi in 1 minute.

Answer 242

2 psi in 1 minute.

Question 243

Question: 243. In a controlled braking emergency, ___________? - Apply the brakes as hard as you can without locking the wheels. - Release and reapply the brakes if the wheels lock or if large steering adjustments need to be made. - All of these thing are part of controlled braking.

Answer 243

All of these thing are part of controlled braking.

Question 244

Question: 244. When parking a vehicle with a modulating control valve, ____________? - Move the lever as far as it will go and hold the lever in place with the locking device. - Move the lever a few inches only. - Hold the lever in place with the locking device.

Answer 244

Move the lever as far as it will go and hold the lever in place with the locking device.

Question 245

Question: 246. On newer vehicles, the parking brake control knob is typically yellow, but on older vehicles, the parking brake might be in what color? - Brown. - Blue. - Purple.

Answer 245

Blue.

Question 246

Question: 245. Manual air tank drains require _________? - No special attention. - A certified mechanic to drain. - The driver to drain the tanks themselves.

Answer 246

The driver to drain the tanks themselves.

Question 247

Question: To test air service brakes, you should ________? - Brake slowly while slowly moving backward. - Stop the vehicles, brake in a low gear, depress the services brakes, and then gently pull against the brakes. - Brake firmly while slowly moving forward.

Answer 247

Brake firmly while slowly moving forward.

Question 248

Question: 248. Air brakes consist of ___________? - Service brake system. - Emergency brake system. - All of the listed answers.

Answer 248

All of the listed answers.

Question 249

Question: 249. What is proper braking technique for drivers traveling down a hill or any other downgrade? - None of the listed answers. - Apply the brakes just hard enough so that you can register the vehicle slowing down, then release the brakes when you are five mph approximately below your safe speed, repeating this step until you reach the end of the downgrade. - Depress the brakes hard so the vehicle stop as quickly as possible.

Answer 249

Apply the brakes just hard enough so that you can register the vehicle slowing down, then release the brakes when you are five mph approximately below your safe speed, repeating this step until you reach the end of the downgrade.

Question 250

Question: 250. When using a vehicle with air brakes, the parking brake needs to be used _________? - To maintain your speed down a steep hill. - Whenever the vehicle is parked. - Only during the cold weather.

Answer 250

Whenever the vehicle is parked.

Question 251

Question: 251. Average stopping distance under normal conditions at 55 mph is ___________________? - 100 feet. - 450 yards. - 32 feet.

Answer 251

450 yards.

Question 252

Question: 252. The trailer air supply knob is usually ___________? - Red and round. - Yellow and diamond-shaped. - Red and octogonal.

Answer 252

Red and octogonal.

Question 253

Question: 253. What does the air compressor governor control? - When the air compressor pumps air into the air storage tanks. - When the air tanks expels air. - How the brakes will be applied.

Answer 253

When the air compressor pumps air into the air storage tanks.

Question 254

Question: 254. If air supply drops when driving, the tractor protection valve __________? - Stop working. - Closes automatically. - Opens up. - Nothing.

Answer 254

Closes automatically.

Question 255

Question: 255. The type of brakes that clamp the rotor between the brake shoes is ___________? - Foundation brakes. - S-cam brakes. - Disc brakes.

Answer 255

Disc brakes.

Question 256

Question: 256. After the initial pressure drop, air leakage for single vehicle should be less than ____________________? - 1 psi in 2 minutes. - 3 psi in 1 minute. - 2 psi in 1 minute.

Answer 256

2 psi in 1 minute.

Question 257

Question: 257. Where is the modulating control valve located on some vehicles? - None of the listed answers. - Bolted to the air compressor. - On the dashboard.

Answer 257

On the dashboard.

Question 258

Question: 258. How does the antilock brake system benefit the driver? - The computer sense any impending wheel lockups and helps you avoid them. - Helps the driver maintain control. - All of the listed answers.

Answer 258

All of the listed answers.

Question 259

Question: 259. How far should manual slack adjusters move before they need to be adjusted? - About an inch. - 3 inches. - 2 inches.

Answer 259

About an inch.

Question 260

Question: 260. When the safety valve release air, this indicates ___________? - That more air is needed. - That something is wrong. - That the air was not clean.

Answer 260

That something is wrong.

Question 261

Question: 261. Total stopping distance with air brakes is: Perception distance + braking distance + brake lag distance + _______? - Sigh distance. - Air temperature. - Reaction distance.

Answer 261

Reaction distance.

Question 262

Question: 262. The use of brakes on a long and steep downgrade under normal conditions is only a supplement to __________? - The use of the front brakes limiting valve. - Use of spring brakes. - The braking effect of the engine.

Answer 262

The braking effect of the engine.

Question 263

Question: 263. What must the air pressure be, at minimum, in both parts of a dual air brake system? - 100 psi. - 120 psi. - 60 psi.

Answer 263

100 psi.

Question 264

Question: 264. What is the purpose of an antilock braking system (ABS)? - A computerized system that keeps your wheel from locking up during hard brake applications. - A system that controls how much alcohol is put into the air system. - A gauge that demonstrates how much air pressure you are applying to the brakes.

Answer 264

A computerized system that keeps your wheel from locking up during hard brake applications.

Question 265

Question: 265. A warning to driver behind you that the air brakes have been applied is the _____________? - Low air warning pressure. - Brake siren. - Stop light switch.

Answer 265

Stop light switch.

Question 266

Question: 266. Which brakes system uses part of the service and parking brake systems to stop the vehicle in the event of a brake system failure? - Emergency brake system. - Parking brakes. - Service Brake.

Answer 266

Emergency brake system.

Question 267

Question: 267. Normally during anti-lock braking, the driver ____________? - Will swerve side-to-side. - Will keep his foot on the pedal and keep applying pressure. - Should stand on the brake pedal with both feet.

Answer 267

Will keep his foot on the pedal and keep applying pressure.

Question 268

Question: 268. The emergency spring brake release knob is ____________? - Red and octogonal. - Round and yellow. - Round and blue.

Answer 268

Round and blue.

Question 269

Question: 269. An air compressor can be cooled by _______ ? Select all that apply. - Engine cooling system. - Air. - Water. - Oil

Answer 269

- Engine cooling system. - Air.

Question 270

Question: 270. When you need to depress the brakes harder and harder just to maintain the same speed, this means _______________ ? - The engine is overheating. - Your brakes are fading. - The air pressure is too high.

Answer 270

Your brakes are fading.

Question 271

Question: 271. On large buses, low pressure warning devices usually signal at ___________? - 80-85 psi. - 100-110 psi. - 95-100 psi.

Answer 271

80-85 psi.

Question 272

Question: 272. You should avoid using the parking brake when ___________? - You are parking. - You are parking an a very steep hill. - The brake are wet freezing temperatures.

Answer 272

The brake are wet freezing temperatures.

Question 273

Question: 273. The belt of a belt-driven air compressor should be ____________? - Checked regularly. - In good condition. - Tight. - All of the listed answers.

Answer 273

All of the listed answers.

Question 274

Question: 274. To stop the vehicle, the brake shoes and linings are pushed against? - The slack adjuster. - The brake chamber. - The brake drum.

Answer 274

The brake drum.

Question 275

Question. 275. When your brakes main air pressure is lost,_______________________? - The air brakes will stop working. - There is not enough ware and oil in the air storage tank. - The springs brakes will come on.

Answer 275

The springs brakes will come on.

Question 276

Question: 276. Under normal braking conditions, the vehicle __________________? - Should shake a little when you apply brakes. - Should be brought to a smooth, safe stop. - Should pull to the right.

Answer 276

Should be brought to a smooth, safe stop.

Question 277

Question: 277. All of the following apply if the low air pressure warning signal does not work EXCEPT____________? - Stopping distance could increase. - Finish your trip, and have it fixed when you get to it. - It could cause sudden emergency braking.

Answer 277

Finish your trip, and have it fixed when you get to it.

Question 278

Question: 278. What color are the malfunction lamps typically on vehicles equipped with ABS? - Green. - White. - Yellow.

Answer 278

Yellow.

Question 279

Question: 279. The brake pedal in an air brake system? - Determines the speed of the air compressor. - Doesn't do anything. - Controls the air pressure applied to put on the brakes.

Answer 279

Controls the air pressure applied to put on the brakes.

Question 280

Question: 280. If your truck or bus has dual parking control valves, you can use pressure from a separate thank to _____________? - Release the spring emergency/parking to move a short distance. - Stay parked twice as long without using up service air pressure - Balance the service brake system when you are parked.

Answer 280

Release the spring emergency/parking to move a short distance.

Question 281

Question: 281. At 55 mph pm dry pavement, the air brake leg distance is how many feet? - 10 feet. - 32 feet. - 50 feet.

Answer 281

32 feet.

Question 282

Question: 282. If your brakes are wet, what should you do to dry them quicker? - Park in the sun. - Apply the brakes lightly while driving in a low gear. - Speed up to 30 mph and apply the brakes very hard.

Answer 282

Apply the brakes lightly while driving in a low gear.

Question 283

Question: 283. All of the following are factors in total stopping distance, EXECPT____________? - Perception distance. - Brake lag distance. - Horizon distance.

Answer 283

Horizon distance.

Question 284

Question: 284. When should the spring brakes activate? - Between 20-40 psi. - 120 psi. - 80 psi.

Answer 284

Between 20-40 psi.

Question 285

Question: 285. Total stopping distance for air brakes is longer than that for hydraulic brakes due to _____________ distance? - Effective braking. - Reaction. - Brake leg.

Answer 285

Brake leg.

Question 286

Question: 286. Which braking system applies and releases the parking brakes when you use the parking brake control? - Parking bake system. - Emergency brake system. - The parking and the service brake system.

Answer 286

Parking bake system.

Question 287

Question: 287. When inspecting air brakes,______________? - Mechanical parts must be in place, not missing or broken. - Cracks longer then one-half the width of the friction area are not allowed on drums or discs. - All of these should be checked for.

Answer 287

All of these should be checked for.

Question 288

Question: 288. To test the vehicles service brakes, move the vehicle _______? - Slowly forward, at about 5 mph. - Forward at 30 mph. - Slowly backwards, then quickly forwards.

Answer 288

Slowly forward, at about 5 mph.

Question 289

Question: 289. How often should alcohol containers be checked during cold weather? - Every week. - Every Month. - Every day.

Answer 289

Every day.

Question 290

Question: 290. To make sure that the spring brakes come on automatically , do all of the following EXCEPT____________? - Pump the brake pedal. - Turn the engine on. - Achieve sufficient air pressures.

Answer 290

Turn the engine on.

Question 291

Question: 291. To check the air compressor governor's "cut in" and "cut out" pressures, you need to _____________? - All of the listed answers. - Monitor the air pressure gauge. - Step on and off the brake to reduce the pressure inside the tank.

Answer 291

All of the listed answers.

Question 292

Question: When stab braking, if you re-apply the brakes before the wheels start rolling, __________? - The vehicle air pressure will increase. - The vehicle wont straighten out. - The brakes will brake.

Answer 292

The vehicle wont straighten out.

Question 293

Question: 293. Stop light switches are necessary because ___________? - They make your cart look nice. - They warn other drivers when a vehicle is braking or coming to a stop. - Stop light switch are not necessary.

Answer 293

They warn other drivers when a vehicle is braking or coming to a stop.

Question 294

Question: 294. The most common type of foundation brakes are _____________? - Disc brake. - S-cam drum brakes. - Wedge brakes.

Answer 294

S-cam drum brakes.

Question 295

Question: 295. Vehicles without automatic air tank drains need to be checked manually to remove ________________? - Alcohol. - Air. - Water and oil.

Answer 295

Water and oil.

Question 296

Question: 296. In a dual air brake system, the first system supplying the rear brakes is commonly know as the "primary" system, and the other is called the _______? - Trailer brake system. - Secondary system. - Other system.

Answer 296

Secondary system.

Question 297

Question: 297. Another name for the brake pedal is the "foot valve", or _________? - Thought-put valve. - Control valve. - Treadle valve.

Answer 297

Treadle valve.

Question 298

Question: 298. The most common problem found in roadside inspection is __________? - Out-of-adjustment brakes. - Dirty cab. - Logbook violation.

Answer 298

Out-of-adjustment brakes.

Question 299

Question: 299. Controlled braking is only possible? - While enough air remains in the air tanks. - If performed by a bad driver. - If the air storage tank has oil in it.

Answer 299

While enough air remains in the air tanks.

Question 300

Question: 300. The S-cam ____________? - Controls the air flow to each of the brake chambers. - Forces the brake shoes against the inside of the brake drum. - Pulls the brake shoes away from the drum and allow the wheels to roll freely.

Answer 300

Forces the brake shoes against the inside of the brake drum.

Question 301

Question: 301. Automatic air tanks ____________? - Automatically expel water and oil. - May be equipped with manual draining. - All of the listed answers.

Answer 301

All of the listed answers.

Question 302

Question: 302. Why should you often check the brake adjustment? - Brakes can get out of adjustment quickly, especially when they are hot. - You shouldn't check the brake adjustment without a professional. - You should only check your brake adjustment during the cold weather and mainly to reduce the rise of ice.

Answer 302

Brakes can get out of adjustment quickly, especially when they are hot.

Question 303

Question: 303. In a dual air brake system, one system will typically control the rear brakes, and the other___________? - Controls the front brakes. - Supplies the trailer brakes alone. - Controls the spring brakes.

Answer 303

Controls the front brakes.

Question 304

Question: 304. If the air compressor has its own oil supply, what should you do before driving? - You don't need to do anything if it has its own oil supply. - Check the oil level. - Empty the air storage tank.

Answer 304

Check the oil level.

Question 305

Question: 305. A device that limits the amount of air provided to the front brakes is a ___________? - Modulating control valve. - Dual parking control valve. - Front brake limiting valve.

Answer 305

Front brake limiting valve.

Question 306

Question: 306. In case of emergency when driving a vehicle equipped with dual parking control valves, you should _____________? - Plan your movements very carefully. - Coast as far as possible. - Stay wherever you are.

Answer 306

Plan your movements very carefully.

Question 307

Question: 307. When the mechanical arm of a wig wag drop into view, that means the pressure in your system has dropped below what psi? - 75 psi. - 100 psi. - 60 psi.

Answer 307

60 psi.

Question 308

Question: 308. How are brakes designed? - To overheat excessively. - To work inefficiently without great driving skill. - Brake shoes or pads rub against the brake drum or discs.

Answer 308

Brake shoes or pads rub against the brake drum or discs.

Question 309

Question: 309. When testing air leakage rates for single vehicles, initial loss rate should be less than _________? - 1 psi in 2 minutes. - 4 psi in one minute. - 2 psi in 1 minutes.

Answer 309

2 psi in 1 minutes.

Question 310

Question: 310. After the initial pressure drop, air leakage for combination vehicles should be less than __________? - 2 psi in 1 minute. - 1 psi in 2 minutes. - 4 psi in 1 minutes.

Answer 310

4 psi in 1 minutes.

Question 311

Question: 311. Which of the following helps the stop light switch work? - By air pressure. - By heat. - With oil and water.

Answer 311

By air pressure.

Question 312

Question: 312. The braking power of the spring brake? - Depends on the adjustment of the service brakes. - Cannot be tested. - Increases over time and use.

Answer 312

Depends on the adjustment of the service brakes.

Question 313

Question: 331. In case of emergency stops, drivers should____________? - Press the brake pedal as hard as they can. - Use stab or controlled braking methods. - Find an incline to help stop the vehicle.

Answer 313

Use stab or controlled braking methods.

Question 314

Question: 314. To stop the vehicle, air brakes system, use ________? - Compressed air. - Engine compression. - Hydraulic fluid.

Answer 314

Compressed air.

Question 315

Question: 315. When increase application pressure to maintain the same speed becomes necessary, you should ___________? - Use a lower gear. - Notify the police. - Slow down and use a lower gear.

Answer 315

Slow down and use a lower gear.

Question 316

Question: 316. What is used to put alcohol into the system and reduce ice risk? - Safety valve. - Air governor. - Alcohol evaporator.

Answer 316

Alcohol evaporator.

Question 317

Question: 317. If you are driving down a steep downgrade and have reached your safe speed of 40 mph, you would apply the service brake until your speed drooped to _____________ mph? - 30. - 35. - 25.

Answer 317

35.

Question 318

Question: 318. Some vehicles are equipped with a control allowing you to apply the spring brakes gradually, called a _______________? - Safety valve. - Modulating control valve. - Dual parking control valve.

Answer 318

Modulating control valve.

Question 319

Question: When you release the brakes and reduce the air pressure, what makes up for that air loss? - Front brake limiting valve. - The brake pedal. - Air compressor.

Answer 319

Air compressor.

Question 320

Question: 320. In case of air pressure loss, a mechanical means of preventing the vehicle from moving is called __________? - Foundation brakes. - Primary brakes. - Spring brakes.

Answer 320

Spring brakes.

Question 321

Question: 321. When inspecting the air brake system, what particular item in the engine compartment should the driver pay specific attention to? - The air compressor drive belt. - The air filter. - The oil filter.

Answer 321

The air compressor drive belt

Question 322

Question: 322. In order to make contact with the brake drum, the brake pads and linings are pushed outward by the _____________? - Push-rod. - S-cam. - Brake pedal.

Answer 322

S-cam.

Question 323

Question: 323. What is the purpose of an air storage tank? - To cool down the air brakes. - To control how much air is compressed. - Air storage tanks are used to hold compressed air.

Answer 323

Air storage tanks are used to hold compressed air.

Question 324

Question: 324. In most newer vehicles, the parking brake control will be _________? - Inaccessible to the driver. - Yellow and diamond-shaped. - Red and round.

Answer 324

Yellow and diamond-shaped.

Question 325

Question: 325. The warning light and buzzer will come on when the air pressure in either system drops below what psi? - 70 psi. - 95 psi. - 60 psi.

Answer 325

60 psi.

Question 326

Question: 326. The level at which the air compressor stops pumping air is _________? - Pump-out. - Cut-out. - Cut-in.

Answer 326

Cut-out.

Question 327

Question: 327. Under normal conditions, in order to engage the parking brakes, the driver should ___________? - Turn off engine. - Apply brakes by pulling the parking brake control knob out. - Be sure air brakes system is fully pressurized.

Answer 327

Apply brakes by pulling the parking brake control knob out.

Question 328

Question: 328. The main factor in causing brake fade is _____________? - Heat. - Speed. - Moisture.

Answer 328

Heat.

Question 329

Question: 329. A dual air brake system? - Has one set of air tanks. - Doesn't have a warning alarm. - Has two separate air brake system, which use a single set of brake controls.

Answer 329

Has two separate air brake system, which use a single set of brake controls.

Question 330

Question: 330. Repeatedly partially increasing and pressing the brake pedal may result in __________? - A buildup of brake air pressure. - A loss of brake air pressure. - No change of brake air pressure.

Answer 330

A loss of brake air pressure.

Question 331

Question: 331. The manual adjustment of automatic slack adjusters is __________? - Dangerous. - Recommended. - Up to the driver.

Answer 331

Dangerous.

Question 332

Question: 332. Besides heat, another cause of brake fade is _________? - Steep uphill inclines. - Incompetent mechanics. - Out-of-adjustment brakes.

Answer 332

Out-of-adjustment brakes.

Question 333

Question: 333. Excessive use of the service brakes results in overheating. which can lead to _________? - Expansion of the brake drums. - Proper adjustment of S-cam. - Increase contact between the brake drums and linings.

Answer 333

Expansion of the brake drums.

Question 334

Question: 334. Brake drums or discs _________? - Should be kept well-greased. - Cannot have any cracks at all. - Cannot have cracks longer than half the the width of the friction area.

Answer 334

Cannot have cracks longer than half the the width of the friction area.

Question 335

Question: 335. Water and oil ___________? - Can damage the brakes. - Need to be drained from the air tank at the end of each day of driving. - All of the listed answers.

Answer 335

All of the listed answers.

Question 336

Question: 336. Stab braking should only be used _____? - When traveling downhill. - On vehicles without anti-lock systems. - On panic situation.

Answer 336

On vehicles without anti-lock systems.

Question 337

Question: 337. What type of brakes pushes a wedge between the ends of two brake shoes to stop the vehicle? - Disc brakes. - Wedge brakes. - S-cam brakes.

Answer 337

Wedge brakes.

Question 338

Question: 338. What is the most common type of foundation brake? - Wedge brake. - Disc brakes. - S-cam brakes.

Answer 338

S-cam brakes.

Question 339

Question: 339. Why should you often check the brake adjustment? - Brakes can get out of adjustment quickly, especially when they are hot. - You shouldn't check the brake adjustment without a professional. - You should only check your brake adjustment during the cold weather and mainly to reduce the risk of ice.

Answer 339

Brakes can get out of adjustment quickly, especially when they are hot.