A) Valid
B) Invalid
C) Depends on engine design
D) Depends of the load
Correct Answer: B
Solution :
Input energy \[=\frac{1g}{\sec }\times \frac{2kcal}{g}=2kcal/\sec .\] Output energy \[=10\ KW=10\ K\ J/S\]\[=\frac{10}{4.2}kcal/\sec .\] Þ \[\eta =\frac{\text{output}\ \text{energy}}{\text{input}\ \text{energy}}=\frac{10}{4.2\times 2}>1,\] it is impossible.
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