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What is another name for the power stroke in the engine cycle?


A) Compression stroke
B) Scavenging stroke
C) Gas blowdown
D) Expansion stroke

E) C) and D)
F) A) and D)

Correct Answer

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What is a typical compression pressure achieved in a current highway truck diesel engine?


A) 150 PSI
B) 350 PSI
C) 600 PSI
D) 1200 PSI

E) A) and D)
F) B) and D)

Correct Answer

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C

Technician A says that diesel fuel is composed of roughly 85% carbon. Technician B says that diesel fuels commonly contain around 15% hydrogen. Who is correct?


A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

E) A) and B)
F) None of the above

Correct Answer

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Which of the following terms is used to describe the overall breathing efficiency of an engine?


A) scavenging
B) thermal efficiency
C) volumetric efficiency
D) combustion efficiency

E) A) and B)
F) A) and C)

Correct Answer

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What term is used to describe the tendency of an object in motion, to want to stay in motion?


A) static friction
B) dynamic friction
C) kinetic energy
D) inertia

E) All of the above
F) A) and B)

Correct Answer

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How many times does any one piston change direction during one complete diesel cycle?


A) two times
B) four times
C) six times
D) eight times

E) A) and C)
F) A) and B)

Correct Answer

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B

Which of the following is another way of saying kinetic energy?


A) inertia
B) energy of motion
C) heat energy
D) thermal efficiency

E) B) and C)
F) All of the above

Correct Answer

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What is the term used to describe the relationship between the work performed by a piston during the compression stroke, and the work received by it during the power stroke?


A) brake horsepower (BHP)
B) torque gain
C) mean effective pressure (MEP)
D) constant volume cycle

E) A) and B)
F) A) and C)

Correct Answer

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Convert the specified displacement of a MaxxForce DT engine with a displacement of 466 cubic inches into liters:


A) 7.6 liters
B) 8.2 liters
C) 8.9 liters
D) 9.4 liters

E) None of the above
F) A) and C)

Correct Answer

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The four strokes of the diesel cycle take place over:


A) 90 degrees rotation
B) 180 degrees rotation
C) 360 degrees rotation
D) 720 degrees rotation

E) All of the above
F) A) and B)

Correct Answer

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What would be the highest thermal efficiency achievable in a current truck diesel engine?


A) 10%
B) 25%
C) 40%
D) 60%

E) A) and D)
F) A) and B)

Correct Answer

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If an engine is described as naturally aspirated, which of the following should be true?


A) Constant geometry turbocharger is used
B) Variable geometry turbocharge is used
C) Roots blower is used
D) There is no manifold boost

E) B) and C)
F) A) and B)

Correct Answer

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When exactly does the gas blowdown phase occur?


A) when exhaust valve first opens
B) at BDC during the exhaust stroke
C) close to TDC on the exhaust stroke
D) during cylinder scavenging

E) B) and C)
F) A) and D)

Correct Answer

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Technician A says that turbochargers are used to aspirate the cylinders on most commercial diesel engines. Technician B says that turbochargers can help expel end gas during valve overlap. Who is correct?


A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

E) A) and C)
F) None of the above

Correct Answer

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Which of the following is true of the term clearance volume?


A) Cylinder volume with piston at TDC
B) Cylinder volume with piston at BDC
C) Cylinder volume with piston removed
D) Volume of a pre-combustion chamber

E) None of the above
F) A) and B)

Correct Answer

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If a diesel engine has a thermal efficiency of 35%, what percentage of the heat energy of the fuel is discharged as rejected heat?


A) 35%
B) 65%
C) Half of 35%
D) Half of 65%

E) C) and D)
F) A) and B)

Correct Answer

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Technician A says that the greater the temperature difference between the cylinder temperature on the compression stroke and the firepoint of the fuel, the longer the ignition lag. Technician B says that a typical diesel fuel formulated for on highway use has a firepoint of about 250 degrees Celsius (482 degrees Fahrenheit) . Who is correct?


A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

E) All of the above
F) A) and B)

Correct Answer

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A Cummins X-15 has a total engine displacement of 15 liters. Convert this into cubic inches:


A) 893 cubic inches
B) 915 cubic inches
C) 943 cubic inches
D) 997 cubic inches

E) C) and D)
F) None of the above

Correct Answer

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What do you do to convert liters into cubic inches?


A) multiply by 61
B) divide by 61
C) multiply by 5/8
D) multiply by 10

E) A) and B)
F) A) and C)

Correct Answer

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Technician A says that valve overlap takes place as the piston completes its compression stroke. Technician B says that cylinder scavenging takes place at valve overlap. Who is correct?


A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

E) C) and D)
F) A) and D)

Correct Answer

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B

Showing 1 - 20 of 35

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