C of Q 310T Engine Prep Exam Question & Answers 2025.docx

C of Q 310T Engine Prep Exam Question
& Answers 2025
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 ANSWERS ✔✔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 ANSWERS ✔✔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 ANSWERS ✔✔c. Inertia


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

,C of Q 310T Engine Prep Exam Question
& Answers 2025
a. 20%
b. 40%
c. 60%
d. 80% - CORRECT ANSWERS ✔✔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 ANSWERS ✔✔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 ANSWERS ✔✔c. Power

,C of Q 310T Engine Prep Exam Question
& Answers 2025
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 ANSWERS
✔✔c. Valve overlap


8. Ideally, where should peak cylinder pressure occur during the power
stroke?!
a. TDC
b. 10 to 20 degrees ATDC
c. 90 degrees ATDC
d. At gas blowdown - CORRECT ANSWERS ✔✔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

, C of Q 310T Engine Prep Exam Question
& Answers 2025
d. Engine housing circuit - CORRECT ANSWERS ✔✔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 ANSWERS ✔✔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 ANSWERS ✔✔b. 15 degrees BTDC


12. At which point in the engine cycle does the crank throw leverage
peak?!
a. TDC