Q.17 A 440 V dc shunt motor has no-load speed of 2000 rpm. It is running at 1000 rpm at full load torque, reduced armature voltage and full field. Its load torque is reduced to 50% of rated value with armature voltage and field voltage held constant at previous values; the speed increases to 1050 rpm. Find armature voltage drop at full load. Neglect effect of armature reaction.

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Q.17 A 440 V dc shunt motor has no-load speed
of 2000 rpm. It is running at 1000 rpm at full
load torque,
reduced armature voltage and full field. Its load
torque is reduced to 50% of rated value with
armature
voltage and field voltage held constant at
previous values; the speed increases to 1050
rpm. Find
armature voltage drop at full load. Neglect effect
of armature reaction.
Transcribed Image Text:Q.17 A 440 V dc shunt motor has no-load speed of 2000 rpm. It is running at 1000 rpm at full load torque, reduced armature voltage and full field. Its load torque is reduced to 50% of rated value with armature voltage and field voltage held constant at previous values; the speed increases to 1050 rpm. Find armature voltage drop at full load. Neglect effect of armature reaction.
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