# IC Engine Questions and Answers – Dual Cycle

This set of IC Engines Multiple Choice Questions & Answers (MCQs) focuses 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

Explanation: None.

2. Dual cycle is also known as ____________
a) Diesel cycle
b) Joule cycle
c) Mixed cycle
d) None of the mentioned

Explanation: 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

Explanation: 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

Explanation: 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

Explanation: 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

Explanation: None.

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

Explanation: 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%

Explanation: None.

Sanfoundry Global Education & Learning Series – IC Engine.