Engineering Thermodynamics
The more effective way of increasing efficiency of Carnot engine is to

Increase higher temperature
Decrease higher temperature
Increase lower temperature
Decrease lower temperature

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Engineering Thermodynamics
The universal gas constant (or molar constant) of a gas is the product of

Molecular mass of the gas and the specific heat at constant pressure
Atomic mass of the gas and the gas constant
Molecular mass of the gas and the gas constant
Molecular mass of the gas and the specific heat at constant volume

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