DC Motors
If the supply voltage for a D.C. motor is increased, which of the following will decrease?

All of these
Operating speed
Full-load current
Starting torque

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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
Nothing will happen to motor
This will result in excessive speed, possibly destroying armature due to excessive centrifugal stresses
Motor will come to stop

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