Engineering Thermodynamics
Otto cycle consists of

Two constant volume and two isothermal processes
One constant pressure, one constant volume and two isentropic processes
Two constant pressure and two isentropic processes
Two constant volume and two isentropic processes

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Engineering Thermodynamics
The work ratio of a gas turbine plant is given by

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

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