Engineering Thermodynamics
The isothermal and adiabatic processes are regarded as

Irreversible process
Reversible or irreversible process
None of the listed here
Reversible process

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Engineering Thermodynamics
The efficiency of a gas turbine is given by

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

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