250+ TOP MCQs on Surface Ignition Alcohol C.I. Engine and Answers

IC Engines Multiple Choice Questions on “Surface Ignition Alcohol C.I. Engine”.

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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
Answer: a
Clarification: Anti-knock characteristics of alcohol is good.

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
Answer: b
Clarification: 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
Answer: b
Clarification: None.

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
Answer: d
Clarification: 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
Answer: c
Clarification: None.

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

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
Answer: a
Clarification: None.

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

10. Which is the effective inhibitor of pre-ignition?
a) alcohol
b) water
c) lead
d) none of the mentioned
Answer: b
Clarification: The effective inhibitor of pre-ignition is water and not alcohol or lead.