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Which of the following can provide a speed control technique in the DC motor interfacing?

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Which of the following can provide a speed control technique in the DC motor interfacing?

(a) PCM

(b) DPCM

(c) ADPCM

(d) PWM

I got this question in an online interview.

Question is from Power Controls in division Interfacing to the Analog World of Embedded Systems

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Best answer
Right choice is (d) PWM

The explanation is: The pulse width modulation can provide a speed control technique in the DC motor interfacing by changing its mark/space ratio.

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