Questions & Answers of Representation of Continuous and Discrete-Time Signals

Question No. 19

The value of $\int_{-\infty}^{+\infty}e^{-t}\delta\left(2t-2\right)\mathrm{dt}$ where δt is the Dirac delta function, is

Question No. 43

The function shown in the figure can be represented as

Question No. 143

A discrete system is represented by the difference equation

X1K+1X2K+1=aa-1a+1a X1KX2K

It has initial conditions X1(0) = 1; X2(0) = 0. The pole locations of the system for a = 1, are

Question No. 144

An input signal x(t) 2 +  5sin(100πt) is sampled with a sampling frequency of 400 Hz and applied to the system whose transfer function is represented by


where, N represents the number of samples per cycle. The output y(n) of the system under steady state is

Question No. 244

A sinusoid x(t) of unknown frequency is sampled by an impulse train of period 20 ms. The resulting sample train is next applied to an ideal lowpass filter with a cutoff at 25 Hz. The filter output is seen to be a sinusoid of frequency 20 Hz. This means that x(t) has a frequency of

Question No. 30

A zero mean random signal is uniformly distributed between limits −a and +a and its mean square value is equal to its variance. Then the r.m.s value of the signal is

Question No. 28

Given a sequence x[n], to generate the sequence y[n] = x[3 − 4n], which one of the following procedures would be correct ?

Question No. 10

The frequency spectrum of a signal is shown in the figure. If this signal is ideally sampled at intervals of 1 ms, then the frequency spectrum of the sampled signal will be





Question No. 84

A signal is processed by a causal filter with transfer function G(s). For a distortion free output signal wave form, G(s) must

Question No. 85

Gs=αz-1+βz-3 is a low pass digital filter with a phase characteristics same as that of the above question if