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Ward Leonard control is basically a _____________

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Ward Leonard control is basically a _____________

(a) Voltage control method

(b) Field diverter method

(c) Field control method

(d) Armature resistance control method

I got this question in an interview.

The question is from Ward Leonard Speed Control Method in section DC Motors of DC Machines

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The correct choice is (a) Voltage control method

To elaborate: Ward Leonard speed control method is combination of rheostatic series control method and shunted armature control method with field control as well. Thus, it can be called as voltage control method also.

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