DC Motors
The commutating pole winding is connected in

Series-parallel with the armature
None of the listed here
Parallel with the armature
Series with the armature

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DC Motors
In variable speed motor

A weaker commutating field is needed at low speed than at high speed
None of these
Same commutating field is needed at low speed than at high speed
A stronger commutating field is needed at low speed than at high speed

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

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