A) valid
B) invalid
C) depends on engine design
D) depends of the load
Correct Answer: B
Solution :
Input energy\[=\frac{1g}{s}\times \frac{2kcal}{g}=2kcal/s\] Output energy\[=10kW=1\,\,k\,\,J/s\] \[=\frac{10}{4.2}kcal/s\] \[\Rightarrow \] \[\eta =\frac{output\,\,energy}{input\,\,energy}=\frac{10}{4.2\times 2}>1\], It is impossible.
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