The given Fig. 18 shows the output torque plotted against crank positions for a single cylinder four-stroke-cycle engine. The areas lying above the zero-torque line represent positive work and the areas below represent negative work. The engine drives a machine which offers a resisting torque equal to the average torque. The relative magnitudes of the hatched areas given by the numbers (in the areas) as shown:

During the cycle, the minimum speed occurs in the engine at

(a) \(B\)

(b) \(D\)

(c) \(H\)

(d) \(F\)

Transcribed Image Text:

Output torque H Avg. torque +49 +43 +36 100 B. DE 180 -75 360 Crank position Fig.18 -73 G 540 720