ENGINE REPAIR FINAL EXAM QUESTIONS AND ANSWERS
Which one of the following is NOT a stroke of the four-stroke cycle?
A) intake
B) compression
C) ignition
D) exhaust - CORRECT ANSWER✅✅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 - CORRECT ANSWER✅✅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
D) 720 - CORRECT ANSWER✅✅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 - CORRECT ANSWER✅✅C) power
,The stroke of an engine is _____ that of a crankshaft throw.
A) half
B) twice
C) four times
D) equal to - CORRECT ANSWER✅✅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 - CORRECT ANSWER✅✅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
B) collapsed lifter
C) burnt intake valve
D) worn piston rings - CORRECT ANSWER✅✅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 - CORRECT ANSWER✅✅A) flywheel
Which V-type engine valve train design may use four camshafts?
A) OHC
B) DOHC
C) OHV
D) DOHV - CORRECT ANSWER✅✅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 - CORRECT ANSWER✅✅B) two
In what type of engine is the intake valve held open longer than normal during the compression stroke?
A) Wankel
B) Atkinson cycle
C) two-stroke
D) diesel - CORRECT ANSWER✅✅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 - CORRECT ANSWER✅✅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 - CORRECT ANSWER✅✅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 - CORRECT ANSWER✅✅D) 720
The reciprocating movement of the piston is converted into rotary motion by the _____.
A) crankshaft and connecting rod
B) intermediate shaft
C) flywheel
D) camshaft - CORRECT ANSWER✅✅A) crankshaft and connecting rod
What component of the engine determines the stroke?
A) cylinder block
B) pistons
Which one of the following is NOT a stroke of the four-stroke cycle?
A) intake
B) compression
C) ignition
D) exhaust - CORRECT ANSWER✅✅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 - CORRECT ANSWER✅✅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
D) 720 - CORRECT ANSWER✅✅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 - CORRECT ANSWER✅✅C) power
,The stroke of an engine is _____ that of a crankshaft throw.
A) half
B) twice
C) four times
D) equal to - CORRECT ANSWER✅✅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 - CORRECT ANSWER✅✅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
B) collapsed lifter
C) burnt intake valve
D) worn piston rings - CORRECT ANSWER✅✅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 - CORRECT ANSWER✅✅A) flywheel
Which V-type engine valve train design may use four camshafts?
A) OHC
B) DOHC
C) OHV
D) DOHV - CORRECT ANSWER✅✅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 - CORRECT ANSWER✅✅B) two
In what type of engine is the intake valve held open longer than normal during the compression stroke?
A) Wankel
B) Atkinson cycle
C) two-stroke
D) diesel - CORRECT ANSWER✅✅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 - CORRECT ANSWER✅✅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 - CORRECT ANSWER✅✅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 - CORRECT ANSWER✅✅D) 720
The reciprocating movement of the piston is converted into rotary motion by the _____.
A) crankshaft and connecting rod
B) intermediate shaft
C) flywheel
D) camshaft - CORRECT ANSWER✅✅A) crankshaft and connecting rod
What component of the engine determines the stroke?
A) cylinder block
B) pistons
