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# GATE EC 2022: Communication System Quiz 8

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Question 1

In a PCM as number of bits per sample increased from 8 to 10 then channel bandwidth required will be increased by _____%

Question 2

The message signal to a delta modulator is If step size is 0.1V, then sampling frequency required to avoid slope overload distraction is ________ KHz.

Question 3

An anlog signal of bandwidth 20kHz is sampled at a rate of 40kHz and qunatized into 16 levels .the resultant digital signal is transmitted using M-ary PSK with raised cosine pulse (roll off factor 0.3) if the channel with 110kHz bandwidth is available to tansmit the data ,then smallest acceptable value of M is____

Question 4

In a binary PCM system, the output signal to noise ratio is maintained at minimum of 40 dB. Then find number of levels required  and the corresponding SNR.

Question 5

Modulating signal is given to PCM system having step size of 0.75V. Bit interval of the resultant signal is ______ m sec.

Question 6

consider an audio signal with spectral components limited to frequency band 300 to 3300 Hz . A PCM signal is generated with smapling rate ogf 8000 sampes/seC. The required output SNR is 30dB. then minimum bandwidth needed _______kHz .(when an

μ-law compander is used with μ = 255)

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