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

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Engineering Thermodynamics
The efficiency of a gas turbine is given by

(Actual temperature drop)/(Isentropic temperature drop)
(Net work output)/(Heat supplied)
(Net work output)/(Work-done by the turbine)
(Isentropic increase in temperature)/(Actual increase in temperature)

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