MPSC Rajyaseva 2018 GS Paper 1 — Question 41
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एका वाफेच्या इंजिनला 3.6 × 10⁹ J/min दराने उष्णता पुरवली जाते. त्यापासून इंजिन 5.4 × 10⁸ J/min दराने कार्य करते. अशा इंजिनची कार्यक्षमता किती टक्के असेल ? A steam engine delivers 5.4 × 10⁸ J of work per minute by taking 3.6 × 10⁹ J of heat from its source. What is the efficiency of the engine ?
a)15%✓ Correct
b)12.5%
c)85%
d)87.5%
Efficiency = (Work output / Heat input) * 100 = (5.4 × 10⁸ / 3.6 × 10⁹) * 100 = (0.15) * 100 = 15%.