Question

A scientist says that the efficiency of his heat engine which work at source temperature $127^{\circ } C$ and sink temperature $27^{\circ} C$ is $26\% ,$ then

• A. it is impossible
• B. it is possible but less probable
• C. it is quite probable
• D. data are incomplete

Answer 1

Answer: (A)

it is impossible

Answer 2

Efficiency is maximum in Carnot engine which is an ideal engine.
$\because \eta =\frac {400-300}{400}\times 100 \%=25 \%$
$\therefore \, \, \, \,$ efficiency $26\%$ is impossible for his heat engine.