DC Motors
The back emf in a dc motor ______

None of the listed here
Opposes the applied voltage
Aids the applied voltage
Aids the armature current

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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

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

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