Engineering Thermodynamics
A manufacturer claims to have a heat engine capable of developing 20 h.p. by receiving heat input of 400 kcal/mt and working between the temperature limits of 227° C and 27° C. His claim is

May be possible with lot of sophistications
Not possible
Theoretically possible
Cost will be very high

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Engineering Thermodynamics
Work-done during adiabatic expansion is given by (where p1 v1, T1 = Pressure, volume and temperature for the initial condition of gas, p2, v2, T2 = Corresponding values for the final condition of gas, R = Gas constant, and γ = Ratio of specific heats)

All of these
(p1 v1 - p2, v2)/(γ - 1)
[m R (T1 - T2)] /(γ - 1)
[m R T1/(γ - 1)][1 - (p2, v2 /p1 v1)]

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Engineering Thermodynamics
Otto cycle consists of

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

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