IC Engine Questions and Answers – Dissociation

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This set of IC Engines Multiple Choice Questions & Answers (MCQs) focuses on “Dissociation”.

1. Dissociation is the disintegration of burnt gases at __________ temperatures.
a) low
b) high
c) constant
d) none of the mentioned
View Answer

Answer: b
Explanation: None.
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2. In lean mixtures no dissociation takes place at _____________ temperatures.
a) low
b) high
c) constant
d) none of the mentioned
View Answer

Answer: a
Explanation: None.

3. In rich mixtures dissociation is prevented by the available ____________
a) CO
b) CO2
c) O2
d) CO and O2
View Answer

Answer: d
Explanation: None.
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4. Power output is maximum at stoichiometric ratio where there is ____________
a) dissociation
b) no dissociation
c) rich mixture
d) none of the mentioned
View Answer

Answer: b
Explanation: None.

5. Maximum dissociation is for ____________
a) lean mixture
b) rich mixture
c) stoichiometric
d) none of the mentioned
View Answer

Answer: c
Explanation: Maximum dissociation is for stoichiometric mixtures while in lean mixtures, generally no dissociation takes place.
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6. With dissociation, peak temperature is obtained ____________
a) at the stoichiometric ratio
b) when the mixture is slightly lean
c) when the mixture is slightly rich
d) none of the mentioned
View Answer

Answer: c
Explanation: None.

7. With dissociation the exhaust gas pressure ____________
a) decreases
b) increases
c) no effect
d) increases upto certain air fuel ratio and then decreases
View Answer

Answer: a
Explanation: None.
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8. For a given compression ratio, as the mixture is made progressively rich from lean the mean effective pressure ____________
a) increases
b) decreases
c) initially increases then decreases
d) remains more or less same
View Answer

Answer: c
Explanation: None.

9. When the mixture is lean ____________
a) efficiency is less
b) power output is less
c) maximum temperature and pressure are higher
d) all of the mentioned
View Answer

Answer: b
Explanation: Power output is less when the mixture is lean.
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10. For a compressor process with variable specific heat the peak temperature and pressure are ____________
a) lower
b) higher
c) no effect
d) none of the mentioned
View Answer

Answer: a
Explanation: None.

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.

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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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