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
View Answer

Answer: b
Explanation: None.

2. In CI engines, abnormal combustion is not a great problem as in SI Engines.
a) True
b) False
View Answer

Answer: a
Explanation: None.

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
View Answer

Answer: b
Explanation: None.
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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
View Answer

Answer:a
Explanation: None.

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
View Answer

Answer: a
Explanation: None.
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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
View Answer

Answer: a
Explanation: Yes, detonation leads to the damage of engine parts.

7. Detonation cannot be prevented by reducing peak cylinder pressure.
a) True
b) False
View Answer

Answer: b
Explanation: In fact, detonation is prevented by reducing peak cylinder pressure.
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8. Detonation can be prevented by increasing the manifold pressure by reducing the throttle opening.
a) True
b) False
View Answer

Answer: b
Explanation: In actual practice, detonation can be prevented by decreasing the manifold pressure by reducing the throttle opening.

9. Knock is less common in ____________ climates.
a) hot
b) cold
c) normal
d) none of the mentioned
View Answer

Answer: b
Explanation: Knock is less common in cold climates as compared to hot and moderate climates.
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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
View Answer

Answer: a
Explanation: None.

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.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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