IC Engine Questions and Answers – Surface Ignition Alcohol C.I. Engine

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This set of IC Engines Multiple Choice Questions & Answers (MCQs) focuses on “Surface Ignition Alcohol C.I. Engine”.

1. Which of the following statement is not correct with respect to alcohols as alternate fuel in IC engines?
a) anti-knock characteristics of alcohol is poor
b) alcohol contains about half the heat energy of gasoline/litre
c) alcohol does not vaporize as easily as gasoline
d) alcohols are corrosive in nature
View Answer

Answer: a
Explanation: Anti-knock characteristics of alcohol is good.
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2. What is the mixture of Gasohol?
a) 90% ethanol + 10% gasoline
b) 10% ethanol + 90% gasoline
c) 40% ethanol + 60% gasoline
d) 50% ethanol + 50% gasoline
View Answer

Answer: b
Explanation: 10% ethanol + 90% gasoline makes gashol.

3. Stoichiometric air-fuel ratio of alcohol when compared to gasoline is?
a) higher
b) lower
c) equal
d) none of the mentioned
View Answer

Answer: b
Explanation: None.
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4. Small amount of gasoline is added to alcohol to ___________
a) reduce the emission
b) to increase the power output
c) to increase the efficiency
d) to improve cold weather starting
View Answer

Answer: d
Explanation: None.

5. Methanol by itself is not a good CI engine fuel because ___________
a) its octane number is high
b) its cetane number is low
c) all of the mentioned
d) none of the mentioned
View Answer

Answer: c
Explanation: None.
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6. Anti-knock characteristics of alcohol when compared to gasoline is?
a) higher
b) lower
c) equal
d) none of the mentioned
View Answer

Answer: a
Explanation: Anti-knock characteristics of alcohol when compared to gasoline is higher and stoichiometric air-fuel ratio of alcohol when compared to gasoline is generally lower.

7. Alcohols alone cannot be used in CI engines as ___________
a) their self ignition temperature is high
b) latent heat of vaporization is high
c) all of the mentioned
d) none of the mentioned
View Answer

Answer: c
Explanation: None.
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8. The compression ratio of alcohol fuel lies between ___________
a) 11:1 to 13:1
b) 7:1 to 9:1
c) 5:1 to 7:1
d) none of the mentioned
View Answer

Answer: a
Explanation: None.

9. The calorific value of alcohols is _____________ in diesel oil.
a) higher than
b) lower than
c) same
d) none of the mentioned
View Answer

Answer: b
Explanation: None.
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10. Which is the effective inhibitor of pre-ignition?
a) alcohol
b) water
c) lead
d) none of the mentioned
View Answer

Answer: b
Explanation: The effective inhibitor of pre-ignition is water and not alcohol or lead.

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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