DieselShip's Online Content Library

Q1. A motor of mass 120 kg with a radius of gyration of 0.5 m is accelerated from rest to its full speed of 720 rev /min in 15 seconds. It is then clutched onto a stationary rotary pump of 50 kg mass with a radius of gyration of 0.38 m.

Calculate EACH of the following:

(a) the torque produced to accelerate the motor. (3)

(b) the common speed in rev/min of the motor and pump after the clutch is engaged. (5)

(c) the reduction in energy during the clutching operation. (4)

(d) the time for the motor and pump to return from the speed calculated in Q1(b) to the running speed of 720 rev/min, if the torque remains as calculated in Q1 (a). (4)