Engineering Thermodynamics
The gas constant (R) is equal to the

Difference of two specific heats
Sum of two specific heats
Product of two specific heats
Ratio of two specific heats

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Engineering Thermodynamics
Which of the following is the correct statement?

All the reversible engines have the same efficiency.
All the reversible and irreversible engines have the same efficiency.
All engines are designed as reversible in order to obtain maximum efficiency.
Irreversible engines have maximum efficiency.

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