Engineering Thermodynamics
When the gas is heated at constant pressure, the heat supplied

Does some external work during expansion
Increases the temperature of the gas
Increases the internal energy of the gas
Both (B) and (C)

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Engineering Thermodynamics
According to Clausius statement of second law of thermodynamics

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

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