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JIPMER 2018
Exam
JIPMER
Year
2018
Subject
Physics
Chapter
Thermodynamics

JIPMER 2018 · Physics · Thermodynamics

If the efficiency of an engine is 50 \% and its work output is 500...

If the efficiency of an engine is 50%50 \% and its work output is 500 J , then find input.

Options

  1. A1000J1000 J
  2. B500J500 J
  3. C100J100 J
  4. D250J250 J

Correct answer

A. 1000J1000 J

Step-by-step solution

∵\because Efficiency, η= Workdone  Heat input ×100\eta=\frac{\text{ Workdone }}{\text{ Heat input }} \times 100 or η100= Work done  Heat input =500 Heat input \frac{\eta}{100}=\frac{\text{ Work done }}{\text{ Heat input }}=\frac{500}{\text{ Heat input }} Heat input =500×10050=1000=\frac{500 \times 100}{50}=1000J\mathrm{ J}
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