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A cycle followed by an engine (made of o...

A cycle followed by an engine (made of one mole of perfect gas in a cylinder with a piston) is shown in figure.

A to B volume constant, B to C adiabatic, C to D volume constant and D to A adiabatic
`" "V_(C)=V_(D)=2V_(A) = 2V_(B)`
(a) In which part of the cycle heat is supplied to the engine form outside?
(b) In which part of the cycle heat is being given to the surrounding by the engine ?
(c ) What is the work done by the engine in one cycle ? Write your answer in term of `p_(A),p_(B),V_(A)` ?
(d) What is the efficiency of the engine ?
`" "(gamma=(5)/(3)` for the gas`)`, `(C_(V)= (3)/(2)R` for one mole `)`

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