DC Motors
The variable resistor shunting the field of a dc series motor is called a

Potential divider
Voltage regulator
Armature divertor
Field divertor

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DC Motors
As there is no back e.m.f. at the instant of starting a D.C. motor, in order to prevent a heavy current from flowing though the armature circuit

Armature is temporarily open circuited
A high value resistor is connected across the field winding
A resistance is connected parallel to the armature
A resistance is connected in series with armature

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DC Motors
In a dc compound machine,

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

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