IC Engine Questions and Answers – Otto Cycle

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

1. The thermal efficiency of a standard Otto cycle for a compression ratio of 5.5 will be ___________
a) 25%
b) 50%
c) 70%
d) 100%

Explanation: None.

2. The efficiency of an Otto cycle is increased by increasing ___________
a) pressure ratio
b) compression ratio
c) temperature ratio
d) none of the mentioned

Explanation: None.

3. The Otto cycle consists of ___________
a) two constant pressure processes and two constant volume processes
b) two constant pressure and two constant entropy processes
c) two constant volume processes and two constant entropy processes
d) none of the mentioned

Explanation: None.
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4. The thermal efficiency of theoretical Otto cycle ___________
a) decreases with increase in compression ratio
b) increases with decrease in compression ratio
c) does not depends upon the pressure ratio
d) none of the mentioned

Explanation: None.

5. What is the work output of the theoretical Otto cycle?
a) increases with increase in compression ratio
b) increases with increase in pressure ratio
c) increases with increase in compression & pressure ratio
d) none of the mentioned

Explanation: None.
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6. The mean effective pressure of an Otto Cycle increases with an increase in ___________
a) pressure ratio
b) compression ratio
c) temperature ratio
d) none of the mentioned

Explanation: The mean effective pressure of an Otto Cycle is directly proportional to its compression ratio, so it increases with an increase in compression ratio.

7. In Otto cycle, heat addition takes place at ___________
a) constant temperature
b) constant pressure
c) constant volume
d) none of the mentioned

Explanation: None.

8. If compression ratio of an engine working on Otto cycle is increased from 5 to 6, its air standard efficiency will increase by ___________
a) 1%
b) 20%
c) 16.67%
d) 8%

Explanation: None.

9. If the compression ratio of an engine working on Otto cycle is increased from 5 to 7, the percentage increase in efficiency will be ___________
a) 2%
b) 4%
c) 8%
d) 14%

Explanation: None.

10. The constant volume cycle is also called ___________
a) Carnot cycle
b) Joule cycle
c) Diesel cycle
d) Otto cycle

Explanation: None.

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