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Calculate the value of the frequency of the 440 V DC supply.

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Calculate the value of the frequency of the 440 V DC supply.

(a) 100 Hz

(b) 0 Hz

(c) 200 Hz

(d) 500 Hz

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Right choice is (b) 0 Hz

For explanation I would say: The frequency is defined as the number of oscillations per second. It is reciprocal of the time period. DC supply magnitude is constant. It does not change with time so the frequency of DC supply is 0 Hz.

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