A steam engine develops 600 kW at 180 r.p.m. The coefficient of fluctuation of energy is found to be 0.5 and the fluctuation of speed is required to be kept within ±1% of the mean speed. The maximum fluctuation of the energy during operation is given by:
1
150 kN-m
2
50 kN-m
3
100 kN-m
4
120 kN-m