DC Motors
By looking at which part of the motor, it can be easily confirmed that a particular motor is D.C. motor?

Stator
Commutator
Frame
Shaft

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

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