Question: A 7 . 4 8 kW , 2 2 0 V , 9 9 0 r . p . m . shunt motor has a

7.48

, 220

, 990

.

.

.

shunt motor has a full load efficiency of

88 %,

the armature resistance is

0.08

ohm and shunt field current is

2

.

If the speed of this motor is reduced to

450

.

.

.

by inserting a resistance in the armature circuit, find the motor output, the armature current, external resistance to be inserted in the armature circuit and overall efficiency. Assume the load torque to remain constant.

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