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  • A steam engine delivers 5.4 x 108 J of work per minute and services 3....
  • A steam engine delivers 5.4 x 108 J of w | Class 11 Physics Chapter Thermodynamics, Thermodynamics NCERT Solutions

    Question:

    A steam engine delivers 5.4 x 108 J of work per minute and services 3.6 x 109 J of heat per minute from its boiler. What is the efficiency of the engine? How much heat is wasted per minute?

    Answer:

    Work done by the steam engine per minute, W = 5.4 × 108 J

    Heat supplied from the boiler, H = 3.6 × 109 J

    Efficiency of the engine =  Output energy / Input energy

    ∴ n  =  W /  H

    = 5.4 × 108  /  3.6 × 109

    Hence, the percentage efficiency of the engine is 15 %.

    Amount of heat wasted = 3.6 × 109 - 5.4 × 108

    = 30.6 × 108 = 3.06 × 109 J

    Therefore, the amount of heat wasted per minute is 3.06 × 109 J.


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    Welcome to the NCERT Solutions for Class 11 Physics - Chapter . This page offers a step-by-step solution to the specific question from Excercise 1 , Question 7: A steam engine delivers 5.4 x 108 J of work per minute and services 3.6 x 109 J of heat per minute f....