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Which is more practical method used in control of series field?

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Which is more practical method used in control of series field?

(a) Diverter

(b) Tappings

(c) Switch relay

(d) Cannot be determined

The question was posed to me during an internship interview.

My doubt stems from Methods of Excitation topic in chapter Commutation Process & Excitation Methods of DC Machines

1 Answer

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Correct answer is (b) Tappings

Explanation: For a given field current, control of series field is achieved by means of a diverter, a low resistance connected in parallel to series winding. A more practical way of a series field control is changing the number of turns of the winding by suitable tappings which are brought out for control purpose.

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