Question: . The four strokes A B , B C , C D and DA in an Otto cycle are shown in the diagram on the

. The four strokes AB,BC,CD and DA in an Otto cycle are shown in the diagram on the left.
AB is an adiabatic contraction and BC is a heat input process at constant volume which results in
the rise of pressure and temperature.
Find the entropy change in the contraction stroke AB .
Identify the power stroke.
Explain in one sentence what happens during the power stroke regarding V and P .
. The four strokes A B , B C , C D and DA in an

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