Week #1 - Introduction & Safety Flashcards
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
2
Q
Convert a torque value of 25 lb-ft. into Newton -meters.
A
33.9
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
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
5
Q
What are the U.S. inventors Eckert and Mauchly known for?
A
The first electronic digital computer
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.
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
8
Q
True or False: 15W-40 is the most commonly used truck engine oil.
A
True
9
Q
An oil pressure sensor usually requires a V-Ref source from the engine ECM.
A
True
10
Q
The tendency of an object in motion to stay in motion is known as what?
A
Inertia
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”
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”
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
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
15
Q
Who patented the first high-pressure liquid fuel injection pump for a diesel engine?
A
Bosch
16
Q
What is used to identify an SAE grade 8 bolt?
A
5 radial strokes on the capscrew head
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
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
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
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.
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
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
23
Q
What grade of eye protection filter would be recommended when performing oxyacetylene cutting?
A
5
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
25
A 2007 Caterpillar ACERT C13 engine has an actual total cylinder swept volume of 12.5 liters. Convert this to cubic inches.
762 cubic inches
26
True or False: The safety device on an oxygen bottle is a rupture disc.
True
27
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.
16.1 liters
28
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%
c. 25%
29
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
c. 340 N • m
30
A wrench with box and open ends at either end, both of the same nominal dimension, is known as what?
Combination wrench
31
Which law states that all energy forms are convertible?
The first law of thermodynamics
32
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.
728 cubic inches
33
Which of the following cooling media would transfer heat most efficiently?
a. EG
b. ELC
c. PG
d. Pure water
d. Pure water
34
Which type of fire extinguisher would effectively snub a runaway engine without itself causing any damage?
Carbon dioxide
35
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
c. Bimetal strip
36
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
d. Use of an auxiliary diesel coolant heater
37
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.
b. Power at the flywheel exceeds that at the drive wheels by 20% to 25%.
38
What is a carcinogen?
A cancer-causing agent
39
True or False: In most hydromechanical fuel systems, when mkaximumk engine rpm is increased, the engine brae power potential will also increase.
True
40
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
b. A defective radiator cap
41
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
c. The employees
42
Oil that has a milky, clouded appearance is probably contaminated with what?
Engine Coolant
43
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.
False
44
When running an engine at rated speed and load, which would typically be the optimum location to peak the cylinder pressure?
15 degrees ATDC
45
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
d. At the inlet to the coolant pump
46
Which of the seven subcircuits of the engine deals with the camshaft, valvetrains, and mechanical actuation of injectors and fuel pumping apparatus?
Feedback assembly
47
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. 550 lb-ft. of work per second
48
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
b. The top tank
49
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
c. Check the crankcase oil level
50
What is the cutting fluid recommended for use when cutting threads in mild steel?
Lard
51
A Detroit Diesel DD16 is rated at 600 HP. Express this in kilowatts.
448 kW
52
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?
Red
53
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?
40
54
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.
1,830 N • m
55
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.
12.9 liters
56
Coolant silicate drop-out usually causes:
a. gooey sludge
b. scaling
d. high TDS readings
a. gooey sludge
57
A Navistar MaxxForce 13 produces 355 kW of power at 1,800 rpm. Convert the kW to an HP value.
475 HP
58
Which type of diesel engine coolant is regarded as potentially the most harmful to humans?
EG
59
Who designed the first centrifugal governor?
Watt
60
Engine oil service classifications are standardized by which of the following organizations?
a. EPA
b. ASTM
c. SAE
d. API
d. API
61
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.
True
62
Engines manufactures before 2017 may use API CK-4 engine oil.
True
63
Water should never be added to premised ELC even if the water is distilled.
True
64
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%
c. 40%
65
True or False: Premixed ELC has an approved service life of up to 6 years.
True
66
Where should the ground clamp be placed when preparing to perform electric arc welding on a chassis?
As close to the weld as possible
67
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?
50
68
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.
438 BPH
69
True or False: The operating temperature of an engine oil should be within 58F (28C) of that of the engine coolant operating temperature.
False
70
Engine breathing in the two-stroke cycle is usually referred to as what?
Scavenging
71
True or False: An engine equipped with EGR and DPF must use API CJ-4 or later engine oil.
True
72
When a modern diesel engine is running at optimum efficiency, the percentage of rejected heat would typically be what?
60%
73
A Cummins ISB engine has a displacement of 6,7 liters. Convert this to cubic inches.
409 cubic inches
74
Materials that have either high acidity or alkalinity are described as what?
Corrosive
75
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
b. Refractometer
76
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.
True
77
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
c. Crude petroleum
78
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. Split ball gauge and micrometer
79
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. Acetylene cylinder fitting
80
Convert 5508 Fahrenheit into Celsius.
288
81
Materials that may emit toxic fumes or explode when brought into contact with other materials are described as what?
Reactive
82
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".
True
83
The world's first automobile was built by who?
Cugnot
84
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?
0.5 mm
85
When running an engine at idle speed, which would typically be the optimum location to peak the cylinder pressure?
15 degrees ATDC
86
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
428 BHP
87
When engine power is calculated rather than tested, it is known as what?
Indicated power
88
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. dry
89
A popular six-cylinder Navistar diesel engine has a bore of 120 mm and a stroke of 155 mm. What is the engine displacement?
10.5 liters
90
Fiberglass fans with flexible-pitch blades are designed to drive air at greatest efficiency at:
a. high speeds
b. low speeds
c. all speeds
b. Low speeds
91
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?
167 lb-ft
92
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.
True
93
Who built the world's first useful steam engine?
Savery
94
Who is known as the "father of the highway diesel engine?"
Cummins
95
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
d. 15 psi
96
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. More power strokes per second occur
97
Which of the following would be the most serious condition when operating oxyacetylene cutting equipment?
a. Popping
b. Flashback
c. Backfire
b. Flashback
98
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.
11.9 liters
99
Who invented the first engine?
Hero
100
True or False: Engine oil temperatures are probably a more accurate means of assessing actual engine operating temperature than the coolant temperature reading.
True
101
A bolt designed so that the shoulder has a small interference fit with the bore it is to be fitted to is called what?
Body bound bolt
102
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?
Gerotor pump
103
The energy of motion is known as what?
Kinetic energy
104
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.
False
105
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. Engine oil temperatures are higher than coolant temperatures
106
In which of the four strokes of the cycle is the cylinder pressure at its highest in a running diesel engine?
Power
107
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
d. All of the above
108
Which of the following accurately describes engine displacement?
a. Peak torque
b. Peak horsepower
c. Total piston swept volume
d. Mean effective pressure
c. Total piston swept volume
109
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
d. 5W-30
110
Which of the following properly describes the first heat engine?
a. Two-stroke cycle
b. Four-stroke cycle
c. Reaction turbine
d. Internal combustion
c. Reaction turbine
111
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
c. All have performed equal work
112
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.
16.1 liters
113
True or False: A leaking oil cooler core must always be replaced.
True
114
Crossflow radiators are often used in aerodynamic low hood and grille designs.
True
115
Which type of oil pump is most commonly used in current highway diesel engines?
a. Vane
b. Plunger
c. External gear
d. Centrifugal
c. External gear
116
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.
True
117
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.
True
118
Usable power at the flywheel of an engine is known as what?
Brake power
119
In what year did Diesel patent his compression ignition engine?
1892
120
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)
d. 1658F (748C)
121
Who invented the term horsepower?
Watt
122
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
b. It will provide a wider operating rpm range
123
When the spindle contacts the anvil on a standard 0-1" micrometer, what should it read?
0 (zero)
124
Which of the following statements best describes 'viscosity'?
a. Resistance to flow
b. Resistance to temperature
c. Breakdown resistance
d. Lubricity
a. Resistance to flow
125
At which point in the engine cycle does the crank throw leverage peak?
Just before 90 degrees ATDC
126
A double pass radiator offers higher cooling efficiencies than a similarly sized single pass radiator.
True
127
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
c. 450 kW
128
Ideally, where should peak cylinder pressure occur during the power stroke?
10 to 20 degrees ATDC
