Two Carnot engines 
and 
are operated in series. The engine 
receives heat from the source at temperature 
and rejects the heat to the sink at temperature 
. The second engine 
receives the heat at temperature 
and rejects to its sink at temperature 
. For what value of 
the efficiencies ofthe two engines are equal
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
C
Efficiency of a Carnot engine
where 
is the temperature of source and 
is the temperature of sink respectively.
For engine 
For engine 
As per question, 
or 
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