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As there is no back emf at the instant of starting a DC motor, in order to prevent a heavy armature current from flowing though the armature circuit ___________

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As there is no back emf at the instant of starting a DC motor, in order to prevent a heavy armature current from flowing though the armature circuit ___________

(a) Series resistance is connected with armature

(b) Parallel resistance is connected to the armature

(c) armature is temporarily open circuited

(d) a high value resistor is connected across the field winding

The question was asked in an interview for internship.

The question is from DC Motor Basics -2 topic in chapter DC Motors of DC Machines

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Correct choice is (a) Series resistance is connected with armature

Easy explanation: To prevent large armature current from damaging the armature circuit we connect series resistance with armature and in order to avoid losses we reconnect the same resistance with field circuit once machine is started, i.e. the exact principle of starters.

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