DC Motors
The commutating winding is basically used in a dc machine

None of the listed here
To improve commutation
To control the speed of machine
To reduce armature reaction

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DC Motors
In variable speed motor

A stronger commutating field is needed at low speed than at high speed
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

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