. Two Carnot engines A and B are operated in series The first one A receives heat at 800 K


and rejects to a reservoir at temperature T.

The second engine B receives the heat rejected by the first engine and in turn rejects to a heat reservoir at 300 K.

Calculate the temperature T for the following situations:(a) The outputs of the two engines are equal and(b) The efficiencies of two engines are equal

 

Best Answer

Answer:

The carnot’s engine can be written as 

72

The work done by the engine A  W =Q-Q2

The work done by the engine B  W =Q-Q3

Now after dividing both side by Q1

73

Final Answer:

(a)When the temperature 650K then the output of the engines are equal.

(b)The efficiencies of two engines are equal when T= 565. 68K

 

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