DC Motors
The armature torque of the D.C. shunt motor is proportional to

armature current only
field flux only
both (A) and (B)
None of these

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DC Motors
In variable speed motor

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

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