Auto 10 - Otto Engine Operation
(64).webp "Auto 10 - Otto Engine Operation - Quiz")
Wherein your knowledge of internal combustion engines is queried.
- 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
Correct Answer
B. Number and arrangement of cylindersExplanation
As is V8, or Slant-6.....Rate this question:
-
- 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
Correct Answer
C. 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.Rate this question:
-
- 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
Correct Answer
D. It enhances breathing over greater RPM rangeExplanation
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.Rate this question:
-
- 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
Correct Answer
A. They can warp when over heated & are expensiveExplanation
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.Rate this question:
-
- 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
Correct Answer
B. Oil burning in combustion chamberExplanation
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.....Rate this question:
-
- 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
Correct Answer
A. Low oil pressureExplanation
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.Rate this question:
-
- 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
Correct Answer
C. Valve problems & cylinder/compression ring wearExplanation
Low compression means gasses can't be compressed in the cylinder. Valve and compression rings are made to keep gasses in the cylinder.Rate this question:
-
- 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
Correct Answer
A. Valve covers & head gasketExplanation
When looking for an il leak, it is best to start at the top of the engine, hence valve covers and head gasket.....Rate this question:
-
- 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
Correct Answer
D. All of the aboveExplanation
All the right conditions are the best way to have good things happen......Rate this question:
-
- 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
Correct Answer
D. 75% of the highest cylinderExplanation
much less than 75% is a sign that cylinders are wearing unevenly.....Rate this question:
-
Back to top