Question

When aliasing will take place?

(a) Sampling signals less than Nyquist Rate

(b) Sampling signals more than Nyquist Rate

(c) Sampling signals equal to Nyquist Rate

(d) Sampling signals at a rate which is twice of Nyquist Rate

I had been asked this question in an interview for internship.

This interesting question is from Instantaneous Frequency and Frequency Modulation in portion Angle Modulation of Analog Communications

Answer 1

The correct choice is (a) Sampling signals less than Nyquist Rate

The best I can explain: Aliasing causes different signals to become indistinguishable when sampled. It happens when the sampling rate is less than Nyquist rate. To prevent aliasing, sampling signals should be at a rate which is twice of Nyquist Rate.