The line code that has zero dc component for pulse transmission of random binary data is

A deterministic signal has the power spectrum given in figure. The minimum sampling rate needed to completely represent this signal is

A probability density function is given by $$p(x) = \,K\,\,\exp \,\,( - \,{x^2}/2),\,\, - \,\infty \, < \,x < \,\infty $$.

The value of K should be

In the signal flow graph of Fig. y/x equals