Thermodynamics Question 316

Question: Two carnot’s engines A and B are operated in series. The first one A receives heat at 1200 K and rejects to a reservoir at T and K. 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 value of T, when work outputs of the two engines are equal.

Options:

A) 600 K

B) 750 K

C) 450 K

D) 900 K

Show Answer

Answer:

Correct Answer: B

Solution:

[b]WQ1+W=η1

WQ1=η2

WQ1=1300T

11+TT300=1200T1200

(T300)1200=(1200T)(2T300)

T=750K



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