An engine has an efficiency of 
. When the temperature of sink is reduced by 62ºC, its efficiency is doubled. Temperature of the source is:
Text Solution
Verified by ExpertsThe correct answer is:
D
Efficiency of engine is given by
∴ 
= 1 – η = 1 – 
............(i)
In other case,
............(ii)
Using Equation (i),
T 2 – 62 = 
T 2
or 
T2 = 62
∴ T 2 = 310 K = 310 – 273ºC
= 37ºC
Hence, T 1 = 
= 372 K
= 372 – 273
= 99ºC
Hence, temperature of source is 99ºC.
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