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

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

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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 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 motor
Motor will come to stop

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