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JEE Main202117 Mar 2021Morning ShiftPhysicsThermodynamicsActual

A Carnot's engine working between 400 K and 800 K has a work output of 1200 J per cycle. The amount of heat energy supplied to the engine from the source in each cycle is:

Options

  1. A3200   J
  2. B1800   J
  3. C1600   J
  4. D2400   J

Correct answer

D. 2400   J

Step-by-step solution

η = T 2   T 1 = Q 2 Q 1 = Q 1 - W Q 1    ∵ W = Q 1 - Q 2 400 800 = 1 - W Q 1 W Q 1 = 1 - 1 2 = 1 2 Q 1 = 2   W = 2400   J

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