In a digital measuring device the input electrical signal is in the frequency range of dc to ac (50) Hz ___

In a digital measuring device the input electrical signal is in the frequency range of dc to ac (50) Hz.

It must be sampled at a rate of

A. f times/sec
B. 0.5 f times/sec
C. 0.25 f times/sec
D. 2 f times/sec

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Answer: D

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