DC Motors
The shaft torque in a dc motor is less than total armature torque because of ______ in the motor.

None of the listed here
Cu losses
Iron and friction losses
Field losses

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DC Motors
If a D.C. shunt motor is working at full load and if shunt field circuit suddenly opens

This will result in excessive speed, possibly destroying armature due to excessive centrifugal stresses
This will make armature to take heavy current, possibly burning it
Nothing will happen to motor
Motor will come to stop

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