dc

(d) 6
5. The cascade of two binary symmetric channels Is a
(A) Symmetric binary channel
(B) Symmetric quaternary channel
(C) Asymmetric quaternary channel
(D) Asymmetric binary channel
6. There are four binary words given as 0000, 0001,0011, 0111.Which of these cannot beam
member of the parity check matrix of a(15,11)linear Block code?
(a) 0011
(b) 0000,0001
(c) 0000
(d) 0111
7. The encoder of a(7,4)systematic cyclic encoder with generating polynomial
g(x)=1+x2+x3 is basically a
(a) 3 stage shift register
(b) 22 stage shift register
(c) 11 stage shift register
(d) 4 stage shift register
8. A source X with entropy 2 bits/message is connected to the receiver Y through a Noise
free channel. The conditional probability of the source, given the receiver is H(X/Y) and the
joint entropy of the source and the receiver H(X,Y) .Then
(a) H(X/Y)=2 bits/message
(b) H(X,Y)=2bits/message
(c) H(X/Y)=1bit/message
(d) H(X,Y)=0bits/message
9. A system has a bandwidth of 4KHz and an S/N ratio of 28 at the input to the Receiver. If
the bandwidth of the channel is doubled ,then
(a) S/N ratio at the input of the received gets halved