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Which DC motor has got maximum self-loading property?

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Which DC motor has got maximum self-loading property?

(a) Series motor

(b) Shunt motor

(c) Cumulative compound motor

(d) Differential compound motor

The question was posed to me in a job interview.

My question is based upon Operating Characteristics of DC Compound Motor topic in division Characteristics of DC Motors of DC Machines

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Correct answer is (d) Differential compound motor

To elaborate: A differentially compound DC motor, flux reduces so sharply at small increase in load at higher values of load. It is advisable that motor should not be used beyond some load value, as it may damage itself by self-loading.

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