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Question 3.SGPYQ.46: A band-limited signal with a maximum frequency of 5 kHz is t......

A band-limited signal with a maximum frequency of 5 kHz is to be sampled. According to the sampling theorem, the sampling frequency in kHz which is not valid is

(a) 5        (b) 12          (c) 15         (d) 20

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Given that f_{\max }=5  kHz

According to sampling theorem, f_{ s } \geq 2 f_{\max }

Since   f_{\max }=5  kHz

Therefore, f_{ s \min }=10  kHz

This implies that   f_{ s } \text { should be } \geq 10  kHz . So option
(a) is invalid option.

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