Question

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

(a) 5 KHz

(b) 12 KHz

(c) 15 KHz

(d) 20 KHz

I had been asked this question in quiz.

This intriguing question comes from Spectrum Analysis of Sampling Process in chapter Digital Control Systems of Control Systems

Answer 1

The correct answer is (a) 5 KHz

To explain I would say: fs (min) =2fm

fs (min) =2*5 =10 KHz

So, fs >=1o KHz.