Heavy Duty Technician – Red Seal Style Practice Exam 1 (Multiple Choice, Questions 1–87)
with Answer Key.
Heavy Duty Technician – Red Seal Practice Exam 1
Multiple Choice (Questions 1–87)
(Drawings Skipped Version)
Section A: Engine Fundamentals (1–25)
1. The main purpose of compression in a diesel engine is to:
A. Cool the air
B. Ignite fuel automatically
C. Reduce engine noise
D. Increase exhaust flow
2. Diesel engines rely on ignition by:
A. Spark plug
B. Heat of compression
C. Carburetor
D. Battery spark
3. Engine displacement refers to:
A. Fuel capacity
B. Total cylinder volume
C. Oil capacity
D. Exhaust size
4. Blow-by occurs when:
A. Fuel leaks
B. Gases escape past piston rings
C. Oil pressure increases
D. Air filter is blocked
5. The camshaft controls:
A. Fuel pressure
B. Valve timing
C. Battery charging
D. Coolant flow
,6. Top Dead Center (TDC) is:
A. Lowest piston position
B. Highest piston position
C. Valve opening point
D. Fuel injection point
7. Horsepower measures:
A. Engine weight
B. Work rate over time
C. Fuel quality
D. Oil viscosity
8. Torque is:
A. Rotational force
B. Electrical power
C. Fuel pressure
D. Air volume
9. Turbochargers increase:
A. Fuel consumption only
B. Air intake pressure
C. Engine noise
D. Oil flow
10. Intercoolers are used to:
A. Heat air
B. Cool compressed air
C. Increase fuel flow
D. Reduce oil pressure
11. Glow plugs assist in:
A. Cooling engine
B. Cold starting
C. Fuel injection
D. Exhaust cleaning
12. Valve overlap is when:
A. Both valves are closed
B. Both valves are open briefly
C. Fuel stops flowing
D. Oil leaks occur
, 13. Incomplete combustion causes:
A. Clean exhaust
B. Smoke and carbon buildup
C. Higher voltage
D. Lower compression
14. Fuel atomization improves:
A. Oil flow
B. Combustion efficiency
C. Battery life
D. Cooling rate
15. Engine timing controls:
A. Valve and injection events
B. Wheel speed
C. Oil level
D. Battery charge
16. A four-stroke engine completes cycle in:
A. 1 stroke
B. 2 strokes
C. 3 strokes
D. 4 strokes
17. Engine load refers to:
A. Weight of engine
B. Work demand on engine
C. Oil pressure
D. Fuel tank size
18. Combustion occurs in the:
A. Crankcase
B. Cylinder
C. Oil pan
D. Radiator
19. Piston rings primarily:
A. Increase fuel flow
B. Seal compression and control oil
C. Start engine
D. Charge battery
with Answer Key.
Heavy Duty Technician – Red Seal Practice Exam 1
Multiple Choice (Questions 1–87)
(Drawings Skipped Version)
Section A: Engine Fundamentals (1–25)
1. The main purpose of compression in a diesel engine is to:
A. Cool the air
B. Ignite fuel automatically
C. Reduce engine noise
D. Increase exhaust flow
2. Diesel engines rely on ignition by:
A. Spark plug
B. Heat of compression
C. Carburetor
D. Battery spark
3. Engine displacement refers to:
A. Fuel capacity
B. Total cylinder volume
C. Oil capacity
D. Exhaust size
4. Blow-by occurs when:
A. Fuel leaks
B. Gases escape past piston rings
C. Oil pressure increases
D. Air filter is blocked
5. The camshaft controls:
A. Fuel pressure
B. Valve timing
C. Battery charging
D. Coolant flow
,6. Top Dead Center (TDC) is:
A. Lowest piston position
B. Highest piston position
C. Valve opening point
D. Fuel injection point
7. Horsepower measures:
A. Engine weight
B. Work rate over time
C. Fuel quality
D. Oil viscosity
8. Torque is:
A. Rotational force
B. Electrical power
C. Fuel pressure
D. Air volume
9. Turbochargers increase:
A. Fuel consumption only
B. Air intake pressure
C. Engine noise
D. Oil flow
10. Intercoolers are used to:
A. Heat air
B. Cool compressed air
C. Increase fuel flow
D. Reduce oil pressure
11. Glow plugs assist in:
A. Cooling engine
B. Cold starting
C. Fuel injection
D. Exhaust cleaning
12. Valve overlap is when:
A. Both valves are closed
B. Both valves are open briefly
C. Fuel stops flowing
D. Oil leaks occur
, 13. Incomplete combustion causes:
A. Clean exhaust
B. Smoke and carbon buildup
C. Higher voltage
D. Lower compression
14. Fuel atomization improves:
A. Oil flow
B. Combustion efficiency
C. Battery life
D. Cooling rate
15. Engine timing controls:
A. Valve and injection events
B. Wheel speed
C. Oil level
D. Battery charge
16. A four-stroke engine completes cycle in:
A. 1 stroke
B. 2 strokes
C. 3 strokes
D. 4 strokes
17. Engine load refers to:
A. Weight of engine
B. Work demand on engine
C. Oil pressure
D. Fuel tank size
18. Combustion occurs in the:
A. Crankcase
B. Cylinder
C. Oil pan
D. Radiator
19. Piston rings primarily:
A. Increase fuel flow
B. Seal compression and control oil
C. Start engine
D. Charge battery
