An electric motor drives a machine through a speed reducing gear of ratio 9:1. The motor armature, with its shaft and gear wheel, has moment of inertia 0.6 kg-m^2. The rotating part of the driven machine has moment of inertia 45 kg-m^2. The driven machine has resisting torque of 100 N-m and the efficiency of reduction gear is 95%. Find the power which the motor must develop to drive the machine at a uniform speed of 160 r.p.m.
(a) 1764 W
(b) 2764 W
(c) 3764 W
(d) 4764 W
This question was addressed to me during a job interview.
Enquiry is from Numericals On Kinetics Of Motion and Loss of Kinetic Energy in chapter Kinematics & Kinetics of Motion of Machine Kinematics