DC Motors
Which of the following in a dc motor, can sustain the maximum temperature rise?

Commutator
Field winding
Slip rings
Armature winding

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DC Motors
If a D.C. shunt motor is working at no load and if shunt field circuit suddenly opens

This will make armature to take heavy current, possibly burning it
Motor will run at very slow speed
Nothing will happen to the motor
This will result in excessive speed, possibly destroying armature due to excessive centrifugal stresses

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