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OTC - Diesel Engines I DET-101 > Week #1 - Introduction & Safety > Flashcards

Week #1 - Introduction & Safety Flashcards

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1
Q

Which of the following is true of an APCS?

a. The APCS helps the cooling system function with higher heat loads.
b. Coolant boil temperature is raised.
c. Cooling system pressure is raised by compressed air.
d. All of the above

A

a. The APCS helps the cooling system function with higher heat loads

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2
Q

Convert a torque value of 25 lb-ft. into Newton -meters.

A

33.9

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3
Q

Which of the following is usually the preferred OEM method of testing an oil cooler bundle?

a. Vacuum test
b. Die penetrant test
c. Pressure test using shop air and a bucket of water

A

a. Vacuum test

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4
Q

When an ECM controls fan cycles, the fan is driven at lower speeds than an equivalent on-off fan management system.

A

True

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5
Q

What are the U.S. inventors Eckert and Mauchly known for?

A

The first electronic digital computer

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6
Q

In a typical diesel-powered highway truck at operating temperature, which of the following should be true?

a. Coolant temperatures should be equal to lube oil temperatures.
b. Coolant temperatures run warmer than lube oil temperatures.
c. Coolant temperatures run cooler than lube oil temperatures.

A

d. Coolant temperatures run cooler than lube oil temperatures.

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7
Q

When interpreting a used engine oil analysis profile, which of the following conditions would be most likely to cause high silicon levels?

a. Plugged air cleaner
b. Oil cooler bundle disintegration
c. Air cleaner perforation
d. Turbocharger bearing failure

A

c. Air cleaner perforation

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8
Q

True or False: 15W-40 is the most commonly used truck engine oil.

A

True

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9
Q

An oil pressure sensor usually requires a V-Ref source from the engine ECM.

A

True

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10
Q

The tendency of an object in motion to stay in motion is known as what?

A

Inertia

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11
Q

When using a dial indicator to check the concentricity of a flywheel housing, during a single rotation of the flywheel the reading on the positive side of the zero on the dial peaks at 0.003 while the reading on the negative side peaks at 0.006. What is the TIR?

A

0.009”

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12
Q

To which of the following values would 1.5 mm be closest?

a. 1.50”
b. 0.250”
c. 0.125”
d. 0.0625”

A

d. 0.625”

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13
Q

If a radiator cap pressure valve fails to seal, which of the following would be the likely outcome?

a. Cavitated cylinder liners
b. Cooler operating temperatures
c. Coolant boil-off
d. Higher HC emissions

A

c. Coolant boil-off

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14
Q

Wet liner cavitation is cause by:

a. air in the radiator
b. vapor bubble collapse
c. aerated coolant
d. combustion gas

A

b. Vapor bubble collapse

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15
Q

Who patented the first high-pressure liquid fuel injection pump for a diesel engine?

A

Bosch

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16
Q

What is used to identify an SAE grade 8 bolt?

A

5 radial strokes on the capscrew head

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17
Q

A full flow oil filter has become completely plugged. What is the likely outcome if the engine is running?

a. The engine seizes
b. The oil pump hydraulically locks
c. A bypass valve diverts the oil around the filter
d. Engine lubrication ceases

A

c. A bypass valve diverts the oil around the filter

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18
Q

Which of the following API classifications indicates that the oil is formulated for diesel engines meeting MY 2010 emissions standards up to 2017?

a. CI-4
b. CJ-4
c. CC
d. GF

A

b. CJ-4

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19
Q

True or False: An oil cooler operates by having coolant pumped through the bundle tubes and oil circulated around the tubes.

A

True

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20
Q

When the thermostat routes the coolant through the bypass circuit, what is happening?

a. The coolant is cycled primarily through the engine.
b. The coolant is cycled primarily through auxiliary heat exchangers.
c. The coolant is cycled primarily through the radiator.

A

a. The coolant is cycled primarily through the engine.

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21
Q

Where does scavenging take place in a four stroke cycle diesel engine?

a. Valve overlap
b. BDC after the power stroke
c. 10 to 20 degrees ATDC on the power stroke
d. TDC after the compression stroke

A

a. Valve overlap

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22
Q

Which of the following properly describes the operating principle of a typical coolant pump on a highway diesel engine?

a. Centrifugal
b. Positive displacement
c. Gear type
d. Constant volume

A

a. Centrifugal

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23
Q

What grade of eye protection filter would be recommended when performing oxyacetylene cutting?

A

5

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24
Q 
Which of the following is required to produce peak torque in a diesel engine?
a,. Peak mechanical efficiency
b. Peak volumetric efficiency
c. Peak brake power
d. Peak cylinder pressure
A

d. Peak cylinder pressure

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25
Q

A 2007 Caterpillar ACERT C13 engine has an actual total cylinder swept volume of 12.5 liters. Convert this to cubic inches.

A

762 cubic inches

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26
Q

True or False: The safety device on an oxygen bottle is a rupture disc.

A

True

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27
Q

A Volvo six-cylinder engine has a bore of 144 mm and a stroke of 165 mm. Calculate the total displacement and express it in liters.

A

16.1 liters

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28
Q

The working load of a chain is normally what percentage of the rated tensile strength of the chain material?

a. 75%
b. 50%
c. 25%
d. 10%

A

c. 25%

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29
Q

Convert 250 lv-ft to Newton-meters and select the closest value from the following answers:

a. 500 N • m
b. 410 N • m
c. 340 N • m
d. 1;67 N • m

A

c. 340 N • m

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30
Q

A wrench with box and open ends at either end, both of the same nominal dimension, is known as what?

A

Combination wrench

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31
Q

Which law states that all energy forms are convertible?

A

The first law of thermodynamics

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32
Q

A six-cylinder engine has a bore of 4.875” and a stroke of 6.5”. Calculate the total displacement and express it in cubic inches.

A

728 cubic inches

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33
Q

Which of the following cooling media would transfer heat most efficiently?

a. EG
b. ELC
c. PG
d. Pure water

A

d. Pure water

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34
Q

Which type of fire extinguisher would effectively snub a runaway engine without itself causing any damage?

A

Carbon dioxide

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35
Q

Which of the following controls the drive efficiency of a thermatic, viscous drive fan hub?

a. Solenoid
b. Fanstat
c. Bimetal strip
d. Viscosity of the silicone drive medium

A

c. Bimetal strip

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36
Q

Which of the following strategies is a requirement of starting diesel engines in subzero (below -178C) temperatures?

a. Avoid shutting the engine off
b. Discharge a can of ether into the engine while cranking
c. Use of an auxiliary diesel coolant heater
d. All of the above

A

d. Use of an auxiliary diesel coolant heater

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37
Q

When comparing truck engine brake power measured at the flywheel to that measured at the drive wheels, which one of the following should be true about brake power?

a. Power at the wheels exceeds that at the flywheel by 10% to 25%.
b. Power at the flywheel exceeds that at the drive wheels by 20% to 25%
c. There is no difference if the transmission and drive carrier are functioning properly.
d. Power can only be measured at the drive wheels.

A

b. Power at the flywheel exceeds that at the drive wheels by 20% to 25%.

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38
Q

What is a carcinogen?

A

A cancer-causing agent

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39
Q

True or False: In most hydromechanical fuel systems, when mkaximumk engine rpm is increased, the engine brae power potential will also increase.

A

True

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40
Q

The cooling system hoses on an engine collapse when the unit is left parked overnight. Which of the following is the likely cause?

a. Improper coolant
b. A defective radiator cap
c. A defective thermostat
d. This is normal

A

b. A defective radiator cap

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41
Q

The reason the exhaust pipe of an engine run inside the shop must always be connected to the shop exhaust system is to protect:

a. Paintwork on the trucks
b. Paintwork within the building
c. The employees

A

c. The employees

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42
Q

Oil that has a milky, clouded appearance is probably contaminated with what?

A

Engine Coolant

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43
Q

True or False: After Plastigage checking a main bearing, using red Platigage, the measuring strip has not been deformed. Therefore, a strip of green-coded Plastigage must be used to perform the measurement.

A

False

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44
Q

When running an engine at rated speed and load, which would typically be the optimum location to peak the cylinder pressure?

A

15 degrees ATDC

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45
Q

In the event of an engine overheating, where is the coolant likely to boil first?

a. At the engine water jacket
b. At the thermostat housing
c. At the tope of the radiator tank
d. At the inlet to the coolant pump

A

d. At the inlet to the coolant pump

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46
Q

Which of the seven subcircuits of the engine deals with the camshaft, valvetrains, and mechanical actuation of injectors and fuel pumping apparatus?

A

Feedback assembly

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47
Q

Which of the following expresses 1 HP correctly?

a. 550 lb-ft. of work per second
b. 5,252 lb-ft. of work per minute
c. 33,000 lb-ft. of work per second

A

a. 550 lb-ft. of work per second

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48
Q

Which would be the warmest portion of a typical downflow-type radiator when the engine is at operating temperature?

a. The bottom tank
b. The top tank
c. The center of the core
d. The surge tank

A

b. The top tank

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49
Q

When investigating a low oil pressure complaint, which of the following should be performed first?

a. Test the oil for fuel contamination
b. Install a master gauge to verify the complaints
c. Check the crankcase oil level
d. Perform a rod and main bearing rollover

A

c. Check the crankcase oil level

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50
Q

What is the cutting fluid recommended for use when cutting threads in mild steel?

A

Lard

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51
Q

A Detroit Diesel DD16 is rated at 600 HP. Express this in kilowatts.

A

448 kW

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52
Q

Which Plastigage color code should be selected to measure a main bearing clearance that the manufacturer specifies must be between 0.0023 and 0.0038?

A

Red

53
Q

How many complete rotations must the thimble of a standard micrometer be turned to travel through a reading of zero to a reading of 1 inch?

A

40

54
Q

A Cummins ISX 11.9 liter engine, programmed to 330 HP, produces a peak torque value of 1,350 lb-ft. at 1,300 rpm. Convert the torque value to Newton-meters.

A

1,830 N • m

55
Q

A 2011 six-cylinder, Paccar MX 360 engine has a bore of 130 mm and stroke of 162 mm. Calculate the displacement of this engine.

A

12.9 liters

56
Q

Coolant silicate drop-out usually causes:

a. gooey sludge
b. scaling
d. high TDS readings

A

a. gooey sludge

57
Q

A Navistar MaxxForce 13 produces 355 kW of power at 1,800 rpm. Convert the kW to an HP value.

A

475 HP

58
Q

Which type of diesel engine coolant is regarded as potentially the most harmful to humans?

A

EG

59
Q

Who designed the first centrifugal governor?

A

Watt

60
Q

Engine oil service classifications are standardized by which of the following organizations?

a. EPA
b. ASTM
c. SAE
d. API

A

d. API

61
Q

True or False: The device used to signal oil pressure values to the ECM on most electronically managed engines uses a variable capacitance operating principle.

A

True

62
Q

Engines manufactures before 2017 may use API CK-4 engine oil.

A

True

63
Q

Water should never be added to premised ELC even if the water is distilled.

A

True

64
Q

What percentage of the potential heat energy of the fuel does the modern diesel engine convert to kinetic energy when the engine is operating close to optimum efficiency?

a. 80%
b. 60%
c. 40%
d. 20%

A

c. 40%

65
Q

True or False: Premixed ELC has an approved service life of up to 6 years.

A

True

66
Q

Where should the ground clamp be placed when preparing to perform electric arc welding on a chassis?

A

As close to the weld as possible

67
Q

How many complete rotations must the thimble of a metric micrometer be turned to travel through a reading of zero to a reading of 25 mm?

A

50

68
Q

Calculate the brake power of an engine producing 1,150 lb-ft. of torque at the flywheel when it is turning at 2,000 rpm.

A

438 BPH

69
Q

True or False: The operating temperature of an engine oil should be within 58F (28C) of that of the engine coolant operating temperature.

A

False

70
Q

Engine breathing in the two-stroke cycle is usually referred to as what?

A

Scavenging

71
Q

True or False: An engine equipped with EGR and DPF must use API CJ-4 or later engine oil.

A

True

72
Q

When a modern diesel engine is running at optimum efficiency, the percentage of rejected heat would typically be what?

A

60%

73
Q

A Cummins ISB engine has a displacement of 6,7 liters. Convert this to cubic inches.

A

409 cubic inches

74
Q

Materials that have either high acidity or alkalinity are described as what?

A

Corrosive

75
Q

What instrument do most OEMs recommend for checking the degree of antifreeze protection in heavy-duty diesel engine coolants?

a. Color-coded test coupon
b. Refractometer
c. Hyddrometer
d. Spectrographic analyzer

A

b. Refractometer

76
Q

15W-40 oil is not an appropriate all-season oil, because winter temperatures are often much lower than the SAE recommended ambient temperature window for this oil.

A

True

77
Q

Which of the following correctly identifies the source of most diesel engine oils?

a. Glycol
b. Asphalt tars
c. Vegetable-based oil
d. Crude petroleum

A

c. Crude petroleum

78
Q

Which of the following precision measuring instruments would be required to measure a valve guide bore?

a. Split ball gauge and micrometer
b. Dial indicator
c. Dial bore gauge
d. Inside micrometer

A

a. Split ball gauge and micrometer

79
Q

Which of the following is required to have a left-hand thread?

a. Acetylene cylinder fitting
b. Cutting nozzle fitting
c. Oxygen cylinder fitting

A

a. Acetylene cylinder fitting

80
Q

Convert 5508 Fahrenheit into Celsius.

A

288

81
Q

Materials that may emit toxic fumes or explode when brought into contact with other materials are described as what?

A

Reactive

82
Q

True or False: After Plastigage checking a main bearing, using red Platigage, the measuring strip has not been deformed. Therefore, the bearing clearance must be greater than 0.006”.

A

True

83
Q

The world’s first automobile was built by who?

A

Cugnot

84
Q

When the thimble of a metric micrometer is turned through one full revolution, the dimension between the anvil and the spindle has changed by how much?

A

0.5 mm

85
Q

When running an engine at idle speed, which would typically be the optimum location to peak the cylinder pressure?

A

15 degrees ATDC

86
Q

Use the PLANC formula to calculate the indicated power of a six-cylinder, fourstroke cycle engine run at 1,800 rpm using the following data:
Stroke: 6.0 inches
Bore: 5.5 inches
MEP: 220 psi

A

428 BHP

87
Q

When engine power is calculated rather than tested, it is known as what?

A

Indicated power

88
Q

When drilling into cast iron, the correct method calls for the procedure to be performed:

a. dry
b. preheated
c. with kerosene
d. with lard

A

a. dry

89
Q

A popular six-cylinder Navistar diesel engine has a bore of 120 mm and a stroke of 155 mm. What is the engine displacement?

A

10.5 liters

90
Q

Fiberglass fans with flexible-pitch blades are designed to drive air at greatest efficiency at:

a. high speeds
b. low speeds
c. all speeds

A

b. Low speeds

91
Q

If a 12” linear extension is used on a torque wrench with a 25” bar, the reading on the torque wrench scale required to produce an actual torque value of 250 lb-ft would be what?

A

167 lb-ft

92
Q

True or False: A diesel engine dash oil pressure gauge displays low and fluctuating oil pressure values when the vehicle is operated. This could be caused buy high engine oil level.

A

True

93
Q

Who built the world’s first useful steam engine?

A

Savery

94
Q

Who is known as the “father of the highway diesel engine?”

A

Cummins

95
Q

If 300 kPa is converted to pounds per square inch, the result would be closest to which of the following valves?

a. 300 psi
b. 45 psi
c. 30 psi
d. 15 psi

A

d. 15 psi

96
Q

Which of the following statements helps explain why an engine develops peak brake power at a higher rpm than peak torque?

a. More power strokes per second occur
b. Volumetric efficiency is better at high rpm
c. There is more time for combustion
d. Cylinder pressures are highest

A

a. More power strokes per second occur

97
Q

Which of the following would be the most serious condition when operating oxyacetylene cutting equipment?

a. Popping
b. Flashback
c. Backfire

A

b. Flashback

98
Q

A six-cylinder engine has a bore of 4.875” and a stroke of 6.5”. Calculate the total displacement and express it in liters.

A

11.9 liters

99
Q

Who invented the first engine?

A

Hero

100
Q

True or False: Engine oil temperatures are probably a more accurate means of assessing actual engine operating temperature than the coolant temperature reading.

A

True

101
Q

A bolt designed so that the shoulder has a small interference fit with the bore it is to be fitted to is called what?

A

Body bound bolt

102
Q

An auxiliary oil pump designed to feel oil to the lubrication circuit on a vehicle that operates at extreme working angles is known as what?

A

Gerotor pump

103
Q

The energy of motion is known as what?

A

Kinetic energy

104
Q

True or False: The location of oxygen bottles on the shop floor does not matter so long as the fire department is aware of where acetylene bottles are stored.

A

False

105
Q

Which of the following statements would usually correctly describe the relative temperatures of the coolant and lubricant when the engine is at operating temperature?

a. Engine oil temperatures are higher than coolant temperatures
b. Coolant and engine oil temperatures should be equal
c. Coolant temperatures are higher than engine oil temperatures

A

a. Engine oil temperatures are higher than coolant temperatures

106
Q

In which of the four strokes of the cycle is the cylinder pressure at its highest in a running diesel engine?

A

Power

107
Q

Which of the following conditions could result from a high crankcase oil level?

a. Friction bearing damage
b. Oil pressure gauge fluctuations
c. Lube oil aeration
d. All of the above

A

d. All of the above

108
Q

Which of the following accurately describes engine displacement?

a. Peak torque
b. Peak horsepower
c. Total piston swept volume
d. Mean effective pressure

A

c. Total piston swept volume

109
Q

Which of the following SAE multigrade oils would likely be recommended by most highway diesel engine OEMs for year-round use in North America?

a. 20W-50
b. 20W-20
c. 15W-40
d. 5W-30

A

d. 5W-30

110
Q

Which of the following properly describes the first heat engine?

a. Two-stroke cycle
b. Four-stroke cycle
c. Reaction turbine
d. Internal combustion

A

c. Reaction turbine

111
Q

A group of cyclists all weighing 175 lb (80 kg) and riding on bicycles of equal weight ride a 6.4-mile (10-kilometer) race and all finish it. Which of the cyclists has performed the most work?

a. The winner
b. The loser
c. All have performed equal work

A

c. All have performed equal work

112
Q

A six-cylinder engine has a bore of 5.69 inches and a stroke of 6.5 inches. Calculate the total displacement and express it in liters.

A

16.1 liters

113
Q

True or False: A leaking oil cooler core must always be replaced.

A

True

114
Q

Crossflow radiators are often used in aerodynamic low hood and grille designs.

A

True

115
Q

Which type of oil pump is most commonly used in current highway diesel engines?

a. Vane
b. Plunger
c. External gear
d. Centrifugal

A

c. External gear

116
Q

True or False: A diesel engine dash oil pressure gauge displays low and fluctuating oil pressure values when the vehicle is operated. This could be caused buy low engine oil level.

A

True

117
Q

True or False: When an EMC controls fan cycles, the fan is usually driven for longer periods than an equivalent on-off fan management system.

A

True

118
Q

Usable power at the flywheel of an engine is known as what?

A

Brake power

119
Q

In what year did Diesel patent his compression ignition engine?

A

1892

120
Q

The temperature rating of a thermatic viscous fan hub is a nominal 1558F (688C). At approximately what equivalent coolant temperature will this produce minimum slip drive as temperatures rise?

a. 2258F (1078C)
b. 1908F (888C)
c. 1558F (688C)
d. 1658F (748C)

A

d. 1658F (748C)

121
Q

Who invented the term horsepower?

A

Watt

122
Q

Which of the following is true of an engine described as having high torque rise when comparing it with its standard version with the same nominal rated power?

a. It will be more fuel efficient
b. It will provide a wider operating rpm range
c. It will produce higher brake power
d. It will have a higher maximum speed

A

b. It will provide a wider operating rpm range

123
Q

When the spindle contacts the anvil on a standard 0-1” micrometer, what should it read?

A

0 (zero)

124
Q

Which of the following statements best describes ‘viscosity’?

a. Resistance to flow
b. Resistance to temperature
c. Breakdown resistance
d. Lubricity

A

a. Resistance to flow

125
Q

At which point in the engine cycle does the crank throw leverage peak?

A

Just before 90 degrees ATDC

126
Q

A double pass radiator offers higher cooling efficiencies than a similarly sized single pass radiator.

A

True

127
Q

Convert 600 hp into kW and select the closest value from the following answers.

a. 650 kW
b. 550 kW
c. 450 kW
d. 350 kW

A

c. 450 kW

128
Q

Ideally, where should peak cylinder pressure occur during the power stroke?

A

10 to 20 degrees ATDC

OTC - Diesel Engines I DET-101 (6 decks)

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