The diesel cycle shown in figure approximates the behavior of a diesel engine. Process ab is an adiabatic compression, process bc is an expansion at constant pressure, process cd is an adiabatic expansion, and process da is cooling at constant volume. Find the efficiency of this cycle in terms of the volumes Va, Vb, Vc, andVd.

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Constant pressure expansion Adiabatic expansion Constant volume cooling Adiabatic compression