ENGINE REPAIR FINAL EXAM 2025/2026
QUESTIONS AND ANSWERS 100% PASS
Which one of the following is NOT a stroke of the four-stroke cycle?
A) intake
B) compression
C) ignition
D) exhaust - ANS C) ignition
What is compression ratio?
A) the diameter of the cylinder
B) cylinder arrangement
C) the ratio of the air to fuel mixture
D) none of these answers is correct - ANS D) none of these answers is correct
To complete a four-stroke cycle in one cylinder, the crankshaft must rotate _____ degrees.
A) 180
B) 360
C) 540
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,D) 720 - ANS D) 720
On a 4-cylinder engine that has a firing order of 1342, if number 1 cylinder is on the exhaust
stroke, what stroke is number 3 cylinder on?
A) intake
B) compression
C) power
D) exhaust - ANS C) power
The stroke of an engine is _____ that of a crankshaft throw.
A) half
B) twice
C) four times
D) equal to - ANS B) twice
The volume of the combustion chamber when the piston is at BDC divided by the volume of the
chamber when the piston is at TDC is called _____.
A) displacement
B) compression ratio
C) volumetric efficiency
D) mechanical efficiency - ANS B) compression ratio
Which of the following engine problems may be indicated by good results from a compression
test and a cylinder leakage test but poor results from a cylinder power balance test?
A) incorrect valve timing
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,B) collapsed lifter
C) burnt intake valve
D) worn piston rings - ANS B) collapsed lifter
The component connected to the crankshaft that serves to store some of the engine's power is
the _____.
A) flywheel
B) connecting rod
C) piston
D) main bearing - ANS A) flywheel
Which V-type engine valve train design may use four camshafts?
A) OHC
B) DOHC
C) OHV
D) DOHV - ANS B) DOHC
A four-stroke cycle engine requires at least _____ valves at the top of each cylinder.
A) one
B) two
C) three
D) four - ANS B) two
In what type of engine is the intake valve held open longer than normal during the compression
stroke?
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, A) Wankel
B) Atkinson cycle
C) two-stroke
D) diesel - ANS B) Atkinson cycle
Both valves are closed on the _____ strokes.
A) power and exhaust
B) intake and exhaust
C) intake and compression
D) compression and power - ANS D) compression and power
A wet compression test is performed on an engine after a dry compression test revealed low
compression on one cylinder. If the compression on the low cylinder rises, it indicates _____.
A) leaking valves
B) worn rings
C) worn camshaft lobe
D) all answers are correct - ANS B) worn rings
How many degrees of crankshaft rotation does it take to complete one complete engine cycle
in a 4-stroke engine?
A) 90
B) 180
C) 360
D) 720 - ANS D) 720
The reciprocating movement of the piston is converted into rotary motion by the _____.
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QUESTIONS AND ANSWERS 100% PASS
Which one of the following is NOT a stroke of the four-stroke cycle?
A) intake
B) compression
C) ignition
D) exhaust - ANS C) ignition
What is compression ratio?
A) the diameter of the cylinder
B) cylinder arrangement
C) the ratio of the air to fuel mixture
D) none of these answers is correct - ANS D) none of these answers is correct
To complete a four-stroke cycle in one cylinder, the crankshaft must rotate _____ degrees.
A) 180
B) 360
C) 540
pg. 1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED
,D) 720 - ANS D) 720
On a 4-cylinder engine that has a firing order of 1342, if number 1 cylinder is on the exhaust
stroke, what stroke is number 3 cylinder on?
A) intake
B) compression
C) power
D) exhaust - ANS C) power
The stroke of an engine is _____ that of a crankshaft throw.
A) half
B) twice
C) four times
D) equal to - ANS B) twice
The volume of the combustion chamber when the piston is at BDC divided by the volume of the
chamber when the piston is at TDC is called _____.
A) displacement
B) compression ratio
C) volumetric efficiency
D) mechanical efficiency - ANS B) compression ratio
Which of the following engine problems may be indicated by good results from a compression
test and a cylinder leakage test but poor results from a cylinder power balance test?
A) incorrect valve timing
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,B) collapsed lifter
C) burnt intake valve
D) worn piston rings - ANS B) collapsed lifter
The component connected to the crankshaft that serves to store some of the engine's power is
the _____.
A) flywheel
B) connecting rod
C) piston
D) main bearing - ANS A) flywheel
Which V-type engine valve train design may use four camshafts?
A) OHC
B) DOHC
C) OHV
D) DOHV - ANS B) DOHC
A four-stroke cycle engine requires at least _____ valves at the top of each cylinder.
A) one
B) two
C) three
D) four - ANS B) two
In what type of engine is the intake valve held open longer than normal during the compression
stroke?
pg. 3 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED
, A) Wankel
B) Atkinson cycle
C) two-stroke
D) diesel - ANS B) Atkinson cycle
Both valves are closed on the _____ strokes.
A) power and exhaust
B) intake and exhaust
C) intake and compression
D) compression and power - ANS D) compression and power
A wet compression test is performed on an engine after a dry compression test revealed low
compression on one cylinder. If the compression on the low cylinder rises, it indicates _____.
A) leaking valves
B) worn rings
C) worn camshaft lobe
D) all answers are correct - ANS B) worn rings
How many degrees of crankshaft rotation does it take to complete one complete engine cycle
in a 4-stroke engine?
A) 90
B) 180
C) 360
D) 720 - ANS D) 720
The reciprocating movement of the piston is converted into rotary motion by the _____.
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