USPS 943 EXAM QUESTIONS AND VERIFIED ANSWERS
6. A PCV valve is controlled by which of the following?
A. valve lifter
B. throttle cable
C. engine vacuum
D. rocker arm
E. exhaust pressure - ---Answers----C. engine vacuum
7. What is wrong during a compression test, if a low
compression reading goes up after a small amount of oil is
squirted into a spark plug hole?
A. defective rocker arm
B. worn lifter
C. cracked cylinder head
D. worn piston rings
E. burnt intake valve - ---Answers----D. worn piston rings
8. A vacuum gauge connected to a well tuned engine should
show a steady reading between which of the following during
engine idle?
A) 23" - 27"
B) 4" - 8"
C) 14" - 22"
D) 32" - 38"
E) 28" - 32" - ---Answers----C) 14" - 22"
6. A PCV valve is controlled by which of the following?
A. valve lifter
B. throttle cable
C. engine vacuum
D. rocker arm
E. exhaust pressure - ---Answers----C. engine vacuum
7. What is wrong during a compression test, if a low
compression reading goes up after a small amount of oil is
squirted into a spark plug hole?
A. defective rocker arm
B. worn lifter
C. cracked cylinder head
D. worn piston rings
E. burnt intake valve - ---Answers----D. worn piston rings
8. A vacuum gauge connected to a well tuned engine should
show a steady reading between which of the following during
engine idle?
A) 23" - 27"
B) 4" - 8"
C) 14" - 22"
D) 32" - 38"
E) 28" - 32" - ---Answers----C) 14" - 22"
