Engineering Board Exam Reviewer · Thermodynamics · medium

A Carnot engine receives 1000 kJ of heat from a source at 600 K and rejects heat to a sink at 300 K. How much work does it produce?

  1. 1000 kJ
  2. 333.3 kJ
  3. 500 kJ
  4. 250 kJ

Answer

C. 500 kJ

Solution

= 1 - 300/600 = 0.5. W = QH = 0.5(1000) = 500 kJ.

More Thermodynamics questions

  1. What is the maximum possible efficiency of a heat engine operating between 800 K and 300 K?
  2. 1000 kJ of heat is transferred directly from a reservoir at 600 K to a reservoir at 300 K. What is the total entropy generated?
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  4. One kilogram of air expands isothermally to three times its initial volume. What is the change in entropy? (R = 0.287 kJ/kg· K)
  5. One kilogram of water is heated from 300 K to 350 K. What is its change in entropy? (c = 4.187 kJ/kg· K)
  6. A system receives 500 kJ of heat reversibly at a constant temperature of 400 K. What is its change in entropy?
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  8. For the same pressure ratio and initial state, which compression process requires the LEAST work in a steady-flow compressor?
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