Engineering Thermodynamics
During throttling process

No work is done by expanding steam
All of these
Heat exchange does not take place
There is no change of internal energy of steam

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

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