DC Motors
A three point starter is considered suitable for

Shunt, compound and series motors
Shunt motors
Shunt as well as compound motors
All D.C. motors

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DC Motors
In variable speed motor

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

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DC Motors
In a dc compound machine,

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

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