Auto 10 - Otto Engine Operation

10 Questions | Total Attempts: 42

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Auto 10 - Otto Engine Operation - Quiz

Wherein your knowledge of internal combustion engines is queried.


Questions and Answers
  • 1. 
    What are the two main features used in classifying automotive gasoline engines?
    • A. 

      Fuel type and number of cylinders

    • B. 

      Number and arrangement of cylinders

    • C. 

      Fuel type and valve arrangement

    • D. 

      Valve and cylinder arrangement

  • 2. 
    How often do timing belts need to be replaced?
    • A. 

      Every year (or every 50 000 Km)

    • B. 

      Every two years, unless engine has freewheeling valves

    • C. 

      At a specified interval (usually 100 000 Km)

    • D. 

      Never; they are durable but noisy

  • 3. 
    Why is variable valve timing beneficial to engine performance?
    • A. 

      It helps the engine reach operating temperatures quicker

    • B. 

      It can double the number of power strokes per cycle

    • C. 

      It restricts breathing at higher engine speeds

    • D. 

      It enhances breathing over greater RPM range

  • 4. 
    Two drawbacks of aluminum engine blocks are….?
    • A. 

      They can warp when over heated & are expensive

    • B. 

      They are heavy and expensive

    • C. 

      They are heavy and can warp when over heated

    • D. 

      They are expensive and have to be painted

  • 5. 
    Blue exhaust smoke is a sign of what?
    • A. 

      Coolant burning in combustion chamber

    • B. 

      Oil burning in combustion chamber

    • C. 

      ATF burning in the combustion chamber

    • D. 

      Brake fluid burning in the combustion chamber

  • 6. 
    Deep metallic knocking can be a sign of what engine problems?
    • A. 

      Low oil pressure

    • B. 

      Worn valve lifters

    • C. 

      Broken timing belt (or chain)

    • D. 

      All of the above

  • 7. 
    The two main causes of low compression are….
    • A. 

      Cylinder/compression ring wear & faulty exhaust resonator

    • B. 

      Valve problems & vacuum system leakage

    • C. 

      Valve problems & cylinder/compression ring wear

    • D. 

      Engine timing off & vacuum system leakage

  • 8. 
    What are the first things to investigate regarding an engine oil leak?
    • A. 

      Valve covers & head gasket

    • B. 

      Front & rear crankshaft seals

    • C. 

      Oil pan gasket & head gasket

    • D. 

      PCV valve & system

  • 9. 
    Maximum fuel economy, low emissions levels and best driveability requires what?
    • A. 

      A mechanically sound engine

    • B. 

      A good ignition system

    • C. 

      Proper fuel system operation

    • D. 

      All of the above

  • 10. 
    When compression testing an engine, the lowest cylinder should be no less than….
    • A. 

      50% of the highest cylinder

    • B. 

      65% of the highest cylinder

    • C. 

      85% of the highest cylinder

    • D. 

      75% of the highest cylinder

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