Auto 10 - Otto Engine Operation

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Quizzes Created: 4 | Total Attempts: 562
| Attempts: 91
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  • 1/10 Questions

    Maximum fuel economy, low emissions levels and best driveability requires what?

    • A mechanically sound engine
    • A good ignition system
    • Proper fuel system operation
    • All of the above
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About This Quiz

Explore the fundamentals of Otto engine operation in the 'Auto 10' quiz. Assess your knowledge on engine classifications, timing belts, variable valve timing, engine block materials, and signs of engine issues. Essential for automotive enthusiasts and engineering students.

Auto 10 - Otto Engine Operation - Quiz

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  • 2. 

    Two drawbacks of aluminum engine blocks are….?

    • They can warp when over heated & are expensive

    • They are heavy and expensive

    • They are heavy and can warp when over heated

    • They are expensive and have to be painted

    Correct Answer
    A. They can warp when over heated & are expensive
    Explanation
    Aluminum is more prone to warping if it gets too hot (compared to cast iron) and it is more expensive, too. But it is much lighter, which offsets those drawbacks.

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  • 3. 

    Blue exhaust smoke is a sign of what?

    • Coolant burning in combustion chamber

    • Oil burning in combustion chamber

    • ATF burning in the combustion chamber

    • Brake fluid burning in the combustion chamber

    Correct Answer
    A. Oil burning in combustion chamber
    Explanation
    Something would be VERY, VERY wrong with an engine that gets brake fluid or ATF into it's combustion chambers. Coolant typically makes a white steamy smoke, and oil makes a grey-blue oily smoke.....

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  • 4. 

    How often do timing belts need to be replaced?

    • Every year (or every 50 000 Km)

    • Every two years, unless engine has freewheeling valves

    • At a specified interval (usually 100 000 Km)

    • Never; they are durable but noisy

    Correct Answer
    A. At a specified interval (usually 100 000 Km)
    Explanation
    Timing belts are durable, but bad things can happen if they fail, so changing them every few (5) years is recommended.

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  • 5. 

    What are the two main features used in classifying automotive gasoline engines?

    • Fuel type and number of cylinders

    • Number and arrangement of cylinders

    • Fuel type and valve arrangement

    • Valve and cylinder arrangement

    Correct Answer
    A. Number and arrangement of cylinders
    Explanation
    As is V8, or Slant-6.....

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  • 6. 

    The two main causes of low compression are….

    • Cylinder/compression ring wear & faulty exhaust resonator

    • Valve problems & vacuum system leakage

    • Valve problems & cylinder/compression ring wear

    • Engine timing off & vacuum system leakage

    Correct Answer
    A. Valve problems & cylinder/compression ring wear
    Explanation
    Low compression means gasses can't be compressed in the cylinder. Valve and compression rings are made to keep gasses in the cylinder.

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  • 7. 

    What are the first things to investigate regarding an engine oil leak?

    • Valve covers & head gasket

    • Front & rear crankshaft seals

    • Oil pan gasket & head gasket

    • PCV valve & system

    Correct Answer
    A. Valve covers & head gasket
    Explanation
    When looking for an il leak, it is best to start at the top of the engine, hence valve covers and head gasket.....

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  • 8. 

    Why is variable valve timing beneficial to engine performance?

    • It helps the engine reach operating temperatures quicker

    • It can double the number of power strokes per cycle

    • It restricts breathing at higher engine speeds

    • It enhances breathing over greater RPM range

    Correct Answer
    A. It enhances breathing over greater RPM range
    Explanation
    Engines require large amounts of air to function, as they run faster, adjusting the valves to allow more air in at higher engine speeds just makes sense.

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  • 9. 

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

    • 50% of the highest cylinder

    • 65% of the highest cylinder

    • 85% of the highest cylinder

    • 75% of the highest cylinder

    Correct Answer
    A. 75% of the highest cylinder
    Explanation
    much less than 75% is a sign that cylinders are wearing unevenly.....

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  • 10. 

    Deep metallic knocking can be a sign of what engine problems?

    • Low oil pressure

    • Worn valve lifters

    • Broken timing belt (or chain)

    • All of the above

    Correct Answer
    A. Low oil pressure
    Explanation
    Valve lifters make more of a ticking sound, and broken timing belt will make no sound. Low oil pressure means oil isn't getting up into the engine to protect metal on metal friction.

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Quiz Review Timeline (Updated): Jun 20, 2023 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Jun 20, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • May 31, 2011
    Quiz Created by
    Ginmonk
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