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Efficiency of Ward Leonard method is ____________

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Efficiency of Ward Leonard method is ____________

(a) Higher than rheostatic control method but lower than shunted field control method

(b) Lower than rheostatic control method

(c) Higher than rheostatic control method and shunted field control method

(d) Depends on load

This question was posed to me during an interview.

My question comes from Ward Leonard Speed Control Method topic in section DC Motors of DC Machines

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Best answer
The correct option is (c) Higher than rheostatic control method and shunted field control method

Best explanation: Unlike all other methods, external resistance is not added in the circuit of control system. Thus, efficiency of Ward Leonard control method is always highest at various different speeds.

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