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Which of the following method is adopted for controlling a DC motor?

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Which of the following method is adopted for controlling a DC motor?

(a) Resistance control

(b) Motor-generator set

(c) Inverter Rectifier

(d) DC chopper

I had been asked this question in homework.

Question is from DC Motor Control Through Choppers topic in division Motor Control by Static Power Converters of DC Machines

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The correct choice is (d) DC chopper

The explanation is: All methods listed above are the methods which can be used to control DC motor, but resistive method makes lots of wastage of energy, while motor-generator set and inverter rectifier set are bulky and costly.

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