IC Engine Questions and Answers – Abnormal Combustion

This set of IC Engine Problems focuses on “Abnormal Combustion”.

1. In ____________ combustion, the flame initiated by the spark travels across the combustion chamber in a fairly uniform manner.
a) abnormal
b) normal
c) knocking
d) none of the mentioned
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2. In CI engines, abnormal combustion is not a great problem as in SI Engines.
a) True
b) False
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3. ____________ knock occurs when the delay period is excessively long so that there is a large amount of fuel in the cylinder for the simultaneous explosion phase.
a) Petrol
b) Diesel
c) Kerosene
d) None of the mentioned
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4. The rate of pressure rise per degree of crank angle is then so great that an audible knocking sound occurs.
a) True
b) False
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5. Knock is a function of the fuel chosen and may be avoided by choosing a fuel with characteristics that do not give too long a delay period.
a) True
b) False
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6. If detonation is allowed to persist under extreme conditions or over many engine cycles, engine parts can be damaged or destroyed.
a) True
b) False
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7. Detonation cannot be prevented by reducing peak cylinder pressure.
a) True
b) False
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8. Detonation can be prevented by increasing the manifold pressure by reducing the throttle opening.
a) True
b) False
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9. Knock is less common in ____________ climates.
a) hot
b) cold
c) normal
d) none of the mentioned
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10. Diesel knock is the sound produced by the very rapid rate of pressure rise during the early part of the uncontrolled second phase of combustion.
a) True
b) False
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Sanfoundry Global Education & Learning Series – IC Engine.

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