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

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

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Engineering Thermodynamics
According to Clausius statement of second law of thermodynamics

Heat can be transferred from low temperature to high temperature source if COP of process is more than unity
Heat can
Heat can
Heat can be transferred for low temperature to high temperature source by using refrigeration cycle

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