IC Engine Questions and Answers – Knocking in S.I. Engine

This set of IC Engines Multiple Choice Questions & Answers (MCQs) focuses on “Knocking In S.I. Engine”.

1. In a spark ignition engine combustion which is initiated between the spark plug electrodes spreads across the combustible mixture.
a) True
b) False
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2. A definite flame front is one that separates the fresh mixture from the products of combustion travels from the spark plug to the other end of the combustion chamber.
a) True
b) False
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3. The process of autoignition has nothing to do towards engine knock.
a) True
b) False
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4. In SI engine, ignition lag is reduced if the initial temperature and pressure are _____________
a) decreased
b) increased
c) constant
d) none of the mentioned
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5. Auto ignition refers to the initiation of combustion without the necessity of a flame.
a) True
b) False
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6. What are the effects of knocking?
a) noise and roughness
b) mechanical damage
c) carbon deposits
d) all of the mentioned
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7. What are the effects of knocking?
a) increase in heat transfer
b) decrease in power output and efficiency
c) preignition
d) all of the mentioned
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8. Increase of pressure increases the self ignition temperature and the induction period.
a) True
b) False
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9. Low engine speeds will give low turbulence and low flame velocities and knock may occur at low speed.
a) True
b) False
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10. Use of low octane fuel can eliminate detonation.
a) True
b) False
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Sanfoundry Global Education & Learning Series – IC Engine.

To practice all areas of IC Engine, here is complete set of 1000+ Multiple Choice Questions and Answers.