Engine Mechanical - Ss

15 Questions | Total Attempts: 543

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Engine Mechanical - Ss - Quiz


Questions and Answers
  • 1. 
    The process of mechanical testing will first help you identify the location of a mechanical problem and then identify the cause of the fault. 
    • A. 

      True

    • B. 

      False

  • 2. 
    What unit of measure is used when testing engine compression and cylinder leakage?
    • A. 

      Pounds per square inch (psi)

    • B. 

      Kilopascals (kPa)

    • C. 

      Both A and B

    • D. 

      Pound feet

  • 3. 
    Which of the following methods may be used to manually perform a cylinder power balance test?
    • A. 

      Unplug the ignition from each cylinder.

    • B. 

      Unplug the fuel injectors.

    • C. 

      Both A and B

    • D. 

      None of the above

  • 4. 
    When testing intake manifold vacuum, the gauge needle oscillates back and forth rapidly, which generally indicates:
    • A. 

      A partially restricted exhaust

    • B. 

      A mechanical condition such as a burned or bent valve.

    • C. 

      Late ignition or valve timing.

    • D. 

      None of the above

  • 5. 
    How even should the cranking compression be between the lowest and highest cylinder readings on an engine without mechanical problems?
    • A. 

      Within 5%

    • B. 

      Within 3%

    • C. 

      Within 14%

    • D. 

      Within 10%

  • 6. 
    Which of the following malfunctions would be revealed during a running compression test?
    • A. 

      A burned exhaust valve

    • B. 

      A badly worn camshaft lobe

    • C. 

      Both A and B

    • D. 

      None of the above

  • 7. 
    When checking cranking compression, which of the following malfunctions is either confirmed or ruled out by performing a wet test on a cylinder with low compression?
    • A. 

      A small hole in the top of the piston

    • B. 

      A burned exhaust valve

    • C. 

      A leaking cylinder head gasket

    • D. 

      None of the above

  • 8. 
    When performing a cylinder leakage test, a small amount of air leakage can be heard from the exhaust tail pipe. This indicates:
    • A. 

      Worn valve guides.

    • B. 

      A bad exhaust valve

    • C. 

      A bent intake valve.

    • D. 

      A leaking cylinder head gasket.

  • 9. 
    When testing cranking compression, Tech A says that all engines may be disabled to avoid starting by placing a shop rag in the engine intake. Tech B says that an engine may be disabled by removing the fuel pump relay (if equipped). Who is correct?
    • A. 

      Tech A

    • B. 

      Tech B

    • C. 

      Both Techs A and B

    • D. 

      Neither Tech A nor B

  • 10. 
    Which of the following can be measured by a running compression test, but NOT by a cranking compression test?
    • A. 

      The sealing capability of the valves

    • B. 

      The sealing capability of the rings and pistons

    • C. 

      Bad piston rings

    • D. 

      None of the above

  • 11. 
    When performing a cranking compression test, Tech A says the final reading should be reached on the second compression pulse. Tech B says the first compression pulse should read at least half as much as the final reading. Who is correct?
    • A. 

      Tech A

    • B. 

      Tech B

    • C. 

      Both Techs A and B

    • D. 

      Neither Tech A nor B

  • 12. 
    Techs A and B are discussing how to obtain the most accurate results when testing cranking compression on a gasoline engine. Tech A says the battery must be at least half charged. Tech B says at least three compression pulses should be made on each cylinder while watching the gauge. Who is correct?
    • A. 

      Tech A

    • B. 

      Tech B

    • C. 

      Both Techs A and B

    • D. 

      Neither Tech A nor B

  • 13. 
    When leak-down testing a cylinder with high leakage, air escaping from the spark plug hole of an adjacent cylinder would indicate a possible?
    • A. 

      Hole in the piston

    • B. 

      Intake valve

    • C. 

      Exhaust valve

    • D. 

      Head gasket

  • 14. 
    In order to leak check a cylinder, the piston must be on the intake stroke.
    • A. 

      True

    • B. 

      False

  • 15. 
    When diagnosing an engine misfire, what test is used to determine the misfiring cylinder?
    • A. 

      Engine vacuum test

    • B. 

      Power balance test

    • C. 

      Cranking compression test

    • D. 

      Cylinder leak-down test

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