# IC Engine Questions and Answers – Comparison of Otto, Diesel and Dual Cycle

This set of IC Engines Multiple Choice Questions & Answers (MCQs) focuses on “Comparison Of Otto, Diesel And Dual Cycle”.

1. For same compression ratio and for same heat added ____________
a) Otto cycle is more efficient than Diesel Cycle
b) Diesel cycle is more efficient than Otto Cycle
c) Efficiency depends on other factors
d) None of the mentioned

Explanation: None.

2. The efficiency of Carnot cycle is maximum for ____________
a) gas engine
b) petrol engine
c) steam engine
d) reversible engine

Explanation: None.

3. For the same compression ratio, the efficiency of dual combustion cycle is?
a) greater than otto cycle
b) less than diesel cycle
c) less than otto cycle and greater than diesel cycle
d) greater than both otto and diesel cycle

Explanation: None.

4. If both Stirling and Carnot cycles operate within the same temperature limits, then efficiency of Stirling cycle as compared to Carnot cycle is?
a) more
b) less
c) equal
d) none of the mentioned

Explanation: None.

5. Choose the correct statement from the following.
a) Diesel cycle is more efficient than Otto cycle for a given compression ratio
b) Otto cycle is more efficient than Diesel cycle for a given compression ratio
c) For a given compression ratio, both Otto and Diesel cycles have same efficiency
d) None of the mentioned

Explanation: Otto cycle is more efficient than Diesel cycle for a given compression ratio.
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6. For constant maximum pressure and heat input, the air standard efficiency of the gas power cycle is in the order.
a) Diesel cycle, Dual cycle, Otto cycle
b) Otto cycle, Diesel cycle, Dual cycle
c) Dual cycle, Otto cycle, Diesel cycle
d) Diesel cycle, Otto cycle, Dual cycle

Explanation: None.

7. Otto cycle efficiency is higher than Diesel cycle efficiency for the same compression ratio and heat input because in Otto cycle ____________
a) combustion is at constant volume
b) expansion and compression are isentropic
c) maximum temperature is higher
d) heat rejection is lower

Explanation: None.

8. The thermal efficiency of a diesel engine is about ____________
a) 15%
b) 30%
c) 50%
d) 70%

Explanation: None.

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