An engineer claims to have made an engine delivering 10 kW power with fuel consumption of 1g/sec. The calorific value of the fuel is 2 kcal/g. The claim of the engineer

An engineer claims to have made an engine delivering 10 kW power with

1.	An engineer claims to have made an engine delivering 10 kW power with fuel consumption of 1g/sec. The calorific value of the fuel is 2 kcal/g. The claim of the engineer
Answer» is valid is invalid depends on engine design depends on the load Solution :INPUT energy `= (1G)/("SEC")xx ("2 kcal")/(G) = "2 kcal/sec"` OUTPUT energy `= 10 kW = 10 kJ//s = (10)/(4.2) "kcal/sec"` `:. eta = ("Output energy")/("Input energy") = (10)/(4.2 xx 2) gt 1`