Q138 / 160 · AP EAMCET 2017 (26 Apr Shift 2) · Physics

On tripling the absolute temperature of the source, the efficiency of a Carnot's heat engine becomes double that of the initial efficiency. Then the initial efficiency of the engine is _________ .

A
$20 \%$
B
$50 \%$
C
$60 \%$
Correct answer
D
$40 \%$

Hence, the correct answer is option: 'D'.

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