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An engineer claims to have made an engin...

An engineer claims to have made an engine delivering 10 kW power with fuel consumption of `1gs^(-1)` . The calorific value of fuel is 2 k cal / g . His claim

A

Valid

B

Invalid

C

Depends on engine design

D

Depends of the load

Text Solution

Verified by Experts

The correct Answer is:
B
`"(Energy)"_("input")= (1g)/(s)xx("2Kcal")/(g)` = 2Kcal/s
`"(Energy)"_("output")` = 10kW = 10KJ/s = `(10)/(4.2)` Kcal/s
Since, `"(Energy)"_("output") gt "(Energy)"_("input")`
It is impossible.
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