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Q.

A heat engine is involved with exchange of heat of 1915 J, -40J, +125J and -QJ during one cycle achieving an efficiency of 50.0%. The value of Q is:

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a

400J

b

640J

c

980J

d

40J

answer is C.

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Detailed Solution

%η=WnetQabsorbed×100     For closed cycle   Wnet=Qnet ⇒50=1915−40+125−Q1915+125×100 ⇒Q=980J
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A heat engine is involved with exchange of heat of 1915 J, -40J, +125J and -QJ during one cycle achieving an efficiency of 50.0%. The value of Q is: