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Flywheel is used with DC compound motor to reduce the peak demand by the motor, compound motor has to be _____________

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Flywheel is used with DC compound motor to reduce the peak demand by the motor, compound motor has to be _____________

(a) Level compounded

(b) Under compounded

(c) Cumulatively compounded

(d) Differentially compounded

This question was addressed to me in a national level competition.

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

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The correct choice is (c) Cumulatively compounded

The best I can explain: In case of cumulative compound DC motor, whenever a mechanical load is subject to fluctuations for short durations, a flywheel is generally provided for carrying peaks. Flywheel will smooth out the load on the motor and will also reduce peaks on power system.

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