Question

For a 4 stroke IC engine, Tmean = 1875 N-m, then find the work done per cycle.

(a) 23.56 kJ

(b) 11.78 kJ

(c) 5.89 kJ

(d) 2.94 kJ

The question was asked in a job interview.

This interesting question is from Coefficient of Fluctuation of Energy topic in section Turning Moment Diagrams and Flywheel of Machine Dynamics

Answer 1

Correct choice is (a) 23.56 kJ

For explanation: For a 4 stroke internal combustion engine, a power stroke takes place every 2 revolution therefore the total angle turned is equal to 4π. Hence θ=4π

therefore work done per cycle = 23.56 kJ.