1. Tardigrade
  2. Question
  3. Physics
  4. An engineer claims to have made an engine delivering 10 kW power with fuel consumption of 1 gs-1. The calorific value of fuel is 2 kcalg-1. This claim is

Question Error Report

Thank you for reporting, we will resolve it shortly

Back to Question

Q. An engineer claims to have made an engine delivering 10 kW power with fuel consumption of $1\,gs^{-1}$. The calorific value of fuel is 2 $kcalg^{-1}$. This claim is

MHT CETMHT CET 2006Work, Energy and Power

Solution:

$P_{output}=10kW$
$p_{input} =2\times 10^3 cal g^{-1} \times 1 gs^{-1}$
= 2 $\times10^3 cals^{-1}$
= $2\times 10^3 \times 4.2 Js^{-1}$
=8.4 kW
As,$ P_{output} > P_{input}$, hence it is never possible