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How shunt field is controlled?

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in DC Machines by (506k points)
How shunt field is controlled?

(a) Diverter resistor in parallel

(b) Tapped field winding

(c) Series regulating resistance

(d) Other methods

The question was posed to me by my school principal while I was bunking the class.

Query is from Methods of Excitation topic in portion Commutation Process & Excitation Methods of DC Machines

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Best answer
The correct option is (c) Series regulating resistance

The explanation is: Control of Excitation: 1) Shunt field: by a series regulating resistance.2) Series field: For small armature by a diverter resistance connected in parallel with series field. For large armature by tapped field winding so the winding turns can be changed.

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