Q.
A diatomic ideal gas is used in a Car engine as the working substance. If during the adiabatic expansion part of the cycle, volume of the gas increases from V to 32V the efficiency of the engine is
The efficiency of cycle is η=1−T1T2
for adiabatic process TVγ−1= constant
For diatomic gas γ=57 T1V1γ−1=T2V2γ−1 T1=T2(V1V2)γ−1 T1=T2(35)57−1 =T2(25)2/5 =T2×4 T1=4T2. η=(1−41)=43=0.75