DC Motors
The power mentioned on the name plate of an electric motor indicates

The output power available at the shaft
The gross power
The power drawn in kVA
The power drawn in kW

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

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

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