2
C of Q 310T Engine Prep questions with verified solutions
|| || || || || || || || ||
1. Which of the following accurately describes engine displacement?!
|| || || || || || || ||
a. Total piston swept volume
|| || || ||
b. Mean effective pressure
|| || ||
c. Peak horsepower
|| ||
d. Peak torque - correct answer✔✔a. Total piston swept volume
|| || || || || || || || ||
2. Engine breathing in the two-stroke cycle is usually referred to as?!
|| || || || || || || || || || ||
a. Inertial
||
b. Scavenging
||
c. Exhaust displacement - correct answer✔✔b. Scavenging
|| || || || || ||
3. The tendency of an object in motion to want to stay in motion is known as?!
|| || || || || || || || || || || || || || || ||
a. Kinetic energy
|| ||
b. Dynamic friction
|| ||
c. Inertia
||
d. Mechanical force - correct answer✔✔c. Inertia
|| || || || || ||
4. When a modern diesel engine is running at optimum efficiency, the percentage of
|| || || || || || || || || || || || || ||
rejected heat ||
would typically be?!
|| ||
a. 20%
||
b. 40%
||
c. 60%
||
,2
d. 80% - correct answer✔✔c. 60%
|| || || || ||
5. What percentage of the potential heat energy of the fuel does the modern diesel engine
|| || || || || || || || || || || || || || || ||
convert to ||
kinetic energy when it is operating close to optimum efficiency?!
|| || || || || || || || ||
a. 20%
||
b. 40%
||
c. 60%
||
d. 80% - correct answer✔✔b. 40%
|| || || || ||
6. In which of the four strokes of the cycle is the cylinder pressure at its highest in a
|| || || || || || || || || || || || || || || || || || ||
running diesel ||
engine?!
a. Intake
||
b. Compression
||
c. Power
||
d. Exhaust - correct answer✔✔c. Power
|| || || || ||
7. Where does scavenging take place on a four-stroke cycle diesel engine?!
|| || || || || || || || || || ||
a. BDC after the power stroke
|| || || || ||
b. TDC after the compression stroke
|| || || || ||
c. Valve overlap
|| ||
d. 10 to 20 degrees ATDC on the power stroke - correct answer✔✔c. Valve overlap
|| || || || || || || || || || || || || ||
8. Ideally, where should peak cylinder pressure occur during the power stroke?!
|| || || || || || || || || || ||
a. TDC
||
,2
b. 10 to 20 degrees ATDC
|| || || || ||
c. 90 degrees ATDC
|| || ||
d. At gas blowdown - correct answer✔✔b. 10 to 20 degrees ATDC
|| || || || || || || || || || ||
9. Which of the seven subcircuits of the engine deals with the camshaft, valvetrains, and
|| || || || || || || || || || || || || || ||
mechanical
actuation of injectors and fuel pumping apparatus?!
|| || || || || ||
a. Powertrain
||
b. Feedback assembly
|| ||
c. Lubrication circuit
|| ||
d. Engine housing circuit - correct answer✔✔b. Feedback assembly
|| || || || || || || ||
10. When running an engine at idle speed, which would typically be the optimum location
|| || || || || || || || || || || || || || ||
to peak the
|| ||
cylinder pressure?! ||
a. 20 degrees BTDC
|| || ||
b. 10 degrees BTDC
|| || ||
c. TDC
||
d. 15 degrees ATDC - correct answer✔✔d. 15 degrees ATDC
|| || || || || || || || ||
11. When running an engine at rated speed and load, which would typically be the
|| || || || || || || || || || || || || || ||
optimum location to || ||
peak the cylinder pressure?!
|| || ||
a. 30 degrees BTDC
|| || ||
b. 15 degrees BTDC
|| || ||
c. TDC
||
d. 15 degrees ATDC - correct answer✔✔b. 15 degrees BTDC
|| || || || || || || || ||
, 2
12. At which point in the engine cycle does the crank throw leverage peak?!
|| || || || || || || || || || || || ||
a. TDC
||
b. Around 15 degrees ATDC
|| || || ||
c. Just before 90 degrees ATDC
|| || || || ||
d. BTDC - correct answer✔✔c. Just before 90 degrees ATDC
|| || || || || || || || ||
13. Which law states that all energy forms are convertible?!
|| || || || || || || || || ||
a. The first law of thermodynamics
|| || || || ||
b. The second law of thermodynamics
|| || || || ||
c. Boyle's law
|| ||
d. Charles's law - correct answer✔✔a. The first law of thermodynamics
|| || || || || || || || || ||
14. The energy of motion is known as?!
|| || || || || || ||
a. Inertia
||
b. Kinetic
||
c. Thermal
||
d. Potential - correct answer✔✔b. Kinetic
|| || || || ||
15. Which of the following is required to produce peak torque in a diesel engine?!
|| || || || || || || || || || || || || ||
a. Peak brake power
|| || ||
b. Peak cylinder pressure
|| || ||
c. Peak volumetric efficiency
|| || ||
d. Peak mechanical efficiency - correct answer✔✔b. Peak cylinder pressure
|| || || || || || || || ||
C of Q 310T Engine Prep questions with verified solutions
|| || || || || || || || ||
1. Which of the following accurately describes engine displacement?!
|| || || || || || || ||
a. Total piston swept volume
|| || || ||
b. Mean effective pressure
|| || ||
c. Peak horsepower
|| ||
d. Peak torque - correct answer✔✔a. Total piston swept volume
|| || || || || || || || ||
2. Engine breathing in the two-stroke cycle is usually referred to as?!
|| || || || || || || || || || ||
a. Inertial
||
b. Scavenging
||
c. Exhaust displacement - correct answer✔✔b. Scavenging
|| || || || || ||
3. The tendency of an object in motion to want to stay in motion is known as?!
|| || || || || || || || || || || || || || || ||
a. Kinetic energy
|| ||
b. Dynamic friction
|| ||
c. Inertia
||
d. Mechanical force - correct answer✔✔c. Inertia
|| || || || || ||
4. When a modern diesel engine is running at optimum efficiency, the percentage of
|| || || || || || || || || || || || || ||
rejected heat ||
would typically be?!
|| ||
a. 20%
||
b. 40%
||
c. 60%
||
,2
d. 80% - correct answer✔✔c. 60%
|| || || || ||
5. What percentage of the potential heat energy of the fuel does the modern diesel engine
|| || || || || || || || || || || || || || || ||
convert to ||
kinetic energy when it is operating close to optimum efficiency?!
|| || || || || || || || ||
a. 20%
||
b. 40%
||
c. 60%
||
d. 80% - correct answer✔✔b. 40%
|| || || || ||
6. In which of the four strokes of the cycle is the cylinder pressure at its highest in a
|| || || || || || || || || || || || || || || || || || ||
running diesel ||
engine?!
a. Intake
||
b. Compression
||
c. Power
||
d. Exhaust - correct answer✔✔c. Power
|| || || || ||
7. Where does scavenging take place on a four-stroke cycle diesel engine?!
|| || || || || || || || || || ||
a. BDC after the power stroke
|| || || || ||
b. TDC after the compression stroke
|| || || || ||
c. Valve overlap
|| ||
d. 10 to 20 degrees ATDC on the power stroke - correct answer✔✔c. Valve overlap
|| || || || || || || || || || || || || ||
8. Ideally, where should peak cylinder pressure occur during the power stroke?!
|| || || || || || || || || || ||
a. TDC
||
,2
b. 10 to 20 degrees ATDC
|| || || || ||
c. 90 degrees ATDC
|| || ||
d. At gas blowdown - correct answer✔✔b. 10 to 20 degrees ATDC
|| || || || || || || || || || ||
9. Which of the seven subcircuits of the engine deals with the camshaft, valvetrains, and
|| || || || || || || || || || || || || || ||
mechanical
actuation of injectors and fuel pumping apparatus?!
|| || || || || ||
a. Powertrain
||
b. Feedback assembly
|| ||
c. Lubrication circuit
|| ||
d. Engine housing circuit - correct answer✔✔b. Feedback assembly
|| || || || || || || ||
10. When running an engine at idle speed, which would typically be the optimum location
|| || || || || || || || || || || || || || ||
to peak the
|| ||
cylinder pressure?! ||
a. 20 degrees BTDC
|| || ||
b. 10 degrees BTDC
|| || ||
c. TDC
||
d. 15 degrees ATDC - correct answer✔✔d. 15 degrees ATDC
|| || || || || || || || ||
11. When running an engine at rated speed and load, which would typically be the
|| || || || || || || || || || || || || || ||
optimum location to || ||
peak the cylinder pressure?!
|| || ||
a. 30 degrees BTDC
|| || ||
b. 15 degrees BTDC
|| || ||
c. TDC
||
d. 15 degrees ATDC - correct answer✔✔b. 15 degrees BTDC
|| || || || || || || || ||
, 2
12. At which point in the engine cycle does the crank throw leverage peak?!
|| || || || || || || || || || || || ||
a. TDC
||
b. Around 15 degrees ATDC
|| || || ||
c. Just before 90 degrees ATDC
|| || || || ||
d. BTDC - correct answer✔✔c. Just before 90 degrees ATDC
|| || || || || || || || ||
13. Which law states that all energy forms are convertible?!
|| || || || || || || || || ||
a. The first law of thermodynamics
|| || || || ||
b. The second law of thermodynamics
|| || || || ||
c. Boyle's law
|| ||
d. Charles's law - correct answer✔✔a. The first law of thermodynamics
|| || || || || || || || || ||
14. The energy of motion is known as?!
|| || || || || || ||
a. Inertia
||
b. Kinetic
||
c. Thermal
||
d. Potential - correct answer✔✔b. Kinetic
|| || || || ||
15. Which of the following is required to produce peak torque in a diesel engine?!
|| || || || || || || || || || || || || ||
a. Peak brake power
|| || ||
b. Peak cylinder pressure
|| || ||
c. Peak volumetric efficiency
|| || ||
d. Peak mechanical efficiency - correct answer✔✔b. Peak cylinder pressure
|| || || || || || || || ||
