Question

Signal to Noise ratio for a hi-fi system is equal to ________

(a) 50 dB

(b) 100 dB

(c) 75 dB

(d) 10 dB

The question was asked in a job interview.

This key question is from Modulation Using Non-Linear Devices (Balanced Modulator) in section Amplitude Modulation of Analog Communications

Answer 1

Correct answer is (a) 50 dB

For explanation: Signal to Noise ratio compares signal power to noise power. It determines how much signal is present in a transmitted wave compared to presence of noise. It is generally expressed in decibels(dB). For a hi-fi system, it should be equal to 50dB.