Quiz 1 - Engine Design And Testing

20 Questions | Total Attempts: 813

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Quiz 1 - Engine Design And Testing - Quiz

Review questions on engine design


Questions and Answers
  • 1. 
    The_____stroke has the piston moving up and down and squeezing the air/fuel mixture in the cylinder.
    • A. 

      Intake

    • B. 

      Compression

    • C. 

      Power

    • D. 

      Exhaust

  • 2. 
    The_____stroke has the piston moving down after the air /fuel mixture explodes in the cylinder.
    • A. 

      Intake

    • B. 

      Compression

    • C. 

      Power

    • D. 

      Exhaust

  • 3. 
    The_____stroke has the piston moving down and an air / fuel mixture entering the cylinder.
    • A. 

      Intake

    • B. 

      Compression

    • C. 

      Power

    • D. 

      Exhaust

  • 4. 
    The_____stroke has the piston moving up and forcing the burnt air / fuel mixture out of the cylinder.
    • A. 

      Intake

    • B. 

      Compression

    • C. 

      Power

    • D. 

      Exhaust

  • 5. 
    Manifold vacuum is formed on the piston's_____stroke.
    • A. 

      Intake

    • B. 

      Compression

    • C. 

      Power

    • D. 

      Exhaust

  • 6. 
    Which one of the following is not a stroke of the four-stroke cycle?
    • A. 

      Intake

    • B. 

      Compression

    • C. 

      Ignition

    • D. 

      Exhaust

  • 7. 
    A four-stroke cycle engine requires at least___valves at the top of each cylinder.
    • A. 

      One

    • B. 

      Two

    • C. 

      Three

    • D. 

      Four

  • 8. 
    Technician A says an engine's firing order is always the same as the cylinder numbering on the crankshaft. Technician B says an engine's firing order is the order in which the cylinders' spark plugs fire. Who is correct?
    • A. 

      A only

    • B. 

      B only

    • C. 

      Both A and B

    • D. 

      Neither A nor B

  • 9. 
    Which of the following conditions is generally not revealed by vacuum readings?
    • A. 

      Restricted exhaust system

    • B. 

      Uneven compression

    • C. 

      Weak ignition spark

    • D. 

      Vacuum leak

  • 10. 
    Vacuum readings of_____and a steady reading are considered acceptable for most engines running at idle speed.
    • A. 

      2 to 5 inches

    • B. 

      At least 100 psi

    • C. 

      15 to 22 inches

    • D. 

      No more than 20%

  • 11. 
    When testing for an exhaust restriction, Technician A runs the engine for a minute at about 2000 rpm with a vacuum gauge installed. Technician B says that a steady reading for the full minute of the test run by Technician A indicates an exhaust restriction. Who is correct?
    • A. 

      A only

    • B. 

      B only

    • C. 

      Both A and B

    • D. 

      Neither A nor B

  • 12. 
    Compression readings of_____ and all cylinders within 25% are considered acceptable for most engines.
    • A. 

      2 to 5 inches

    • B. 

      At least 100 psi

    • C. 

      15 to 22 inches

    • D. 

      No more than 20%

  • 13. 
    When wet compression test readings are considerably higher than dry compression test readings, what situation is most likely indicated?
    • A. 

      The engine has leaking valves

    • B. 

      The engine test results are normal

    • C. 

      The engine has worn piston rings

    • D. 

      The engine has a worn camshaft

  • 14. 
    Cylinder leakage readings of_____ with the only leakage past the piston rings are considered acceptable for most engines.
    • A. 

      2 to 5 inches

    • B. 

      At least 100 psi

    • C. 

      15 to 22 inches

    • D. 

      No more than 20%

  • 15. 
    When conducting a cylinder leakage test, Technician A says 15 percent leakage around the rings mean the cylinder in question is defective. Technician B says 15 percent leakage past the intake valve is considered acceptable. Who is correct?
    • A. 

      A only

    • B. 

      B only

    • C. 

      Both A and B

    • D. 

      Neither A nor B

  • 16. 
    Which of the following engine problems may be indicated by good results from a cylinder leakage test but poor results from a running vacuum test at idle and poor results from a compression test.
    • A. 

      Intake valve not opening

    • B. 

      Leaking head gasket

    • C. 

      Leaking intake valve

    • D. 

      Worn piston rings

  • 17. 
    What is a 'universal' first step in most engine testing?
    • A. 

      Disable the ignition system

    • B. 

      Hold the throttle wide open

    • C. 

      Charge the battery

    • D. 

      Warm up the engine if possible

  • 18. 
    What is considered the best way to determine if there is a head gasket leaking between a combustion chamber and the cooling system?
    • A. 

      Vacuum test

    • B. 

      Compression test

    • C. 

      Cylinder leakage test

    • D. 

      Test the cooling system for combustion gasses (chemical or exhaust analyzer)

  • 19. 
    Which test can give you the best idea of which cylinder has a problem and in most cases what specific problem exists in that cylinder?
    • A. 

      Vacuum test

    • B. 

      Compression test

    • C. 

      Cylinder leakage test

    • D. 

      Lubricating system gas analysis

  • 20. 
    Which of the following can under certain conditions sound like an internal engine ticking noise?
    • A. 

      Normal fuel injector noise

    • B. 

      Minor exhaust leaks near the engine

    • C. 

      Certain emission control devices cycling on and off

    • D. 

      All of the above

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