250+ TOP MCQs on Dual Cycle and Answers

IC Engines Multiple Choice Questions on “Dual Cycle”.

1. Dual Cycle is a combination of ____________
a) Otto cycle and Diesel cycle
b) Otto cycle and Stirling cycle
c) Brayton cycle and steam cycle
d) None of the mentioned
Answer: a
Clarification: None.

2. Dual cycle is also known as ____________
a) Diesel cycle
b) Joule cycle
c) Mixed cycle
d) None of the mentioned
Answer: c
Clarification: Another name for Dual cycle is a mixed cycle.

3. In Dual cycle, heat addition takes place ____________
a) at Constant volume
b) first at constant volume then at constant pressure
c) constant pressure
d) none of the mentioned
Answer: b
Clarification: Since, Dual Cycle is a combination of Otto cycle and Diesel cycle, so in Dual cycle, generally heat addition takes place first at constant volume then at constant pressure.

4. In Dual cycle, heat rejection takes place ____________
a) at constant volume
b) first at constant volume then at constant pressure
c) constant pressure
d) none of the mentioned
Answer: a
Clarification: Since, Dual Cycle is a combination of Otto cycle and Diesel cycle, so in Dual cycle, generally heat rejection takes place at constant volume.

5. Most high speed compression engines operate on ____________
a) Otto cycle
b) Diesel Cycle
c) Dual cycle
d) Carnot cycle
Answer: c
Clarification: None.

6. In a standard dual air cycle, for a fixed amount of heat supplied and a fixed value of compression ratio, the mean effective pressure ____________
a) shall increase with increase in rp and decreases in rc
b) shall increase with decrease in rp and increases in rc
c) shall remain independent of rp
d) shall remain independent of rc
Answer: a
Clarification: None.

7. The thermal efficiency of a diesel engine on weak mixtures is ____________
a) unaffected
b) lower
c) higher
d) none of the mentioned
Answer: c
Clarification: None.

8. The volumetric efficiency of a well designed engine may be ____________
a) 30 to 40%
b) 40 to 60%
c) 60 to 70%
d) 75 to 90%
Answer: d
Clarification: None.

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