This question has Statement–1 and Statement–2. Of the four choices given after the statements, choose the one that best describes the two Statements.
Statement–1 : An inventor claims to have constructed an engine that has an efficiency of 30% when operated between the boiling and freezing points of water. This is not possible.
Statement–2 : The efficiency of a real engine is always less than the efficiency of Carnot engine operation between the same two temperatures.

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Statement–1 is true; Statement–2 is true, Statement–2 not the correct explanation of Statement–1

Statement–1is true, Statement–2 is false

Statement–1 is false, Statement–2 is true

Statement–1 is true; Statement–2 is true, Statement–2 the correct explanation of Statement–1

answer is D.

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Detailed Solution

So carnot efficiency for source and sink at temperature 373K and is given as $η = (1 - \frac{T_{2}}{T_{1}}) \times 100 = (1 - \frac{273}{373}) \times 100$
$\Rightarrow η = (1 - 0.732) \times 100$
$= 26.8 %$ max possible
Statement–1: Is true & it is explained by Statement–2