Question
Mon March 31, 2014 By: Anshul Kansal

A CYCLIC PROCESS CONTAINS FOUR STEPS AB,BC,CD & DA.HEAT INVOLVED IN DIFFERENT PROCESSES IS GIVEN AS Q(AB) =200J,Q(BC)=600J,Q(CA)=-300J,Q(DA)=0, THEN EFFICIENCY OF PROCESS IS 

1. 5/8 2. 3/8 3. 1/4 4. 1/2

Expert Reply
Tue April 01, 2014
The process involves four steps AB, BC, CD and DA.
 
The heat involved in the four processess are
Q (AB) = 200 J
Q (BC) = 600 J
Q (CD) = -300 J
Q (DA) = 0 J
 
From the values of Q, we can say that the total heat input in the process is
 
Qin = 200 + 600 + 0 = 800 J
 
And the total heat output from the process is
 
Qout = -300 J
 
Hence, the efficiency of the process is
 
η = 1 - (Qout/Qin) = 1 - 300/800 = 1 - 3/8 = 5/8
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