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

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

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DC Motors
In a dc compound machine,

Both play equally dominant role
Series field winding plays dominant role
Either can play dominant role
Shunt field winding plays dominant role

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DC Motors
In variable speed motor

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

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