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In order to run motor on rated speed while carrying out Swinburne’s test we add ______________

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In order to run motor on rated speed while carrying out Swinburne’s test we add ______________

(a) Resistance in parallel with armature

(b) Resistance in series with armature

(c) Inductor in series with armature

(d) Capacitor in parallel with armature

I had been asked this question in an interview for job.

This key question is from Swinburne’s Test topic in section Efficiency and Testing of DC Machines

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The correct answer is (b) Resistance in series with armature

For explanation: The machine would run at higher than rated speed with a rated armature voltage. Therefore, a series in the armature circuit is employed to reduce voltage applied to the motor armature such that it runs at rated speed.

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