Question

What per cent of supplied energy is converted into mechanical work by an IC engine?

(a) 10%-20%

(b) 30%-40%

(c) 50%-60%

(d) 70%-80%

The question was posed to me in an interview.

My question is from I.C Engine topic in portion Internal Combustion Engine of Farm Machinery

Answer 1

Correct answer is (b) 30%-40%

To explain I would say: An IC engine on average is capable of converting just 30-40% of the supplied energy into mechanical work because a large part of the waste energy is in the form of heat that is released to the environment through coolant, fins etc.