test questions and answers
a1 automotive engine repair
11. One revolution
on a standard micrometer equals what distance?
d. Correct, each revolution of the spindle on a standard micrometer
equals .025”(twenty five thousandths of an inch)
All of the following are symptoms of worn rings except:
a. Excessive oil consumption
b. Low compression
c. Coolant in the oil
d. Reduced fuel economy
a. Incorrect, worn rings causes higher oil
b. Incorrect, worn rings causes loss of compression
c. Correct, coolant should never be in the cylinder or combustion
d. Incorrect, loss of power will reduce fuel economy
After an engine overhaul, the engine runs rough and lacks power.
What is the most likely cause?
a. Camshaft out of time
b. Crankshaft out of balance
c. Valves not seated in yet
d. Clogged fuel injectors
a. Correct, incorrect cam timing will cause rough
running and a lack of power and is the most likely cause after an
b. Incorrect, although an out of balance crankshaft will cause
vibration, it would not cause a lack of power
c. Incorrect, if the valves were properly lapped in, no seating
period should be required
d. Incorrect, clogged fuel injectors can cause this symptom but is
not likely immediately following an engine overhaul
The harmonic balancer serves what function?
a. Keeps the engine in balance
b. Keeps the induction system in balance
c. Reduces vibrations through the crankshaft during power strokes
d. Reduces the imbalance between the crankshaft and camshaft
a. Incorrect, the harmonic balancer does not
balance the engine
b. Incorrect, has nothing to do with the induction system
c. Correct, each power stroke from each cylinder causes sudden
strong vibrations through the crankshaft and the harmonic balancer
helps reduce these vibrations
d. Incorrect, there is no imbalance between the cam and crank
Technician A says a clogged EGR port will cause detonation.
Technician B says a clogged EGR port will not affect engine
performance. Who is correct?
a. Technician A Only
b. Technician B Only
c. Both Technician A and B
d. Neither Technician A or B
b. Correct, a clogged EGR port will only prevent exhaust gases from
entering the intake which will not affect engine performance
c. Incorrect, Technician A is wrong
d. Incorrect, Technician B is right
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