ISRO Mechanical & Aerospace 2013 - Question 39

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A Carnot engine rejects 30% of absorbed heat to a sink at 30°C. The temperature of the heat source is

  • A. 100°C
  • B. 433°C
  • C. 737°C
  • D. 1010°C

Answer: C. 737°C

Explanation: Q_out = 0.3 Q_in. Q_out/Q_in = T_L/T_H = 0.3. T_L = 30+273 = 303 K. T_H = 303/0.3 = 1010 K. T_H = 1010 - 273 = 737 C.

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