Engineering Thermodynamics
Gases have

Under some conditions one value and sometimes two values of specific heat
Only one value of specific heat
No value of specific heat
Two values of specific heat

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Engineering Thermodynamics
The specific heat at constant volume is

The amount of heat required to raise the temperature of unit mass of gas through one degree, at constant pressure
Any one of the above
The amount of heat required to raise the temperature of 1 kg of water through one degree
The amount of heat required to raise the temperature of unit mass of gas through one degree, at constant volume

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Engineering Thermodynamics
The efficiency of a gas turbine is given by

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

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