railway RRB JE (CBT I + CBT II) Mock Test 2024 Communication Systems Noise in Analog Communication System
A 1 mW signal having a bandwidth of 100 MHz is transmitted to a receiver through cable that has 40 dB loss. If the effective one side noise spectral density at the receiver is 10-20 Watt/Hz, then the signal to noise ratio at the receiver is
1
50 dB
2
30 dB
3
40 dB
4
60 dB