DC Motors
In a D.C. shunt motor, under the conditions of maximum power, the current in the armature will be

Less than full-load current
Rated full-load current
More than full-load current
Almost negligible

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

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