In Laplace transform, multiplication by e-at in time domain becomes
In the given figure 15.6 shows a series, R - C circuit fed by a current source i(t). There is an initial voltage v0. across the capacitor. The system
Paley Wiener criterion for designing of filter is
The impulse response h[n] of a linear time invariant system is given asIf the input to the above system is the sequence ejpn/4, then the output is
If f(k) ↔ F(z), then kn fk ↔
If I (s) , the final value of i(t) is
The analog signal given below is sampled bysamples per second for m(t) = 3 sinpt + 2 sinpt then folding frequency is
If £[f(t)] = F(s), then £[f(t - T)] =
If v(t) is a time varying voltage, is
If is the Laplace transform of f(t) then f(0+) is
Z transform is a non-linear operation.
The period of the function cos is
As per time displacement theorem in Laplace transformation, displacement in the time domain by T becomes
Which one is a linear system?
A voltage wave v =+sin ωt + 7.5 sin 3 ω(t) is applied to a series combination of two elements. The current is i = 5 sin (ωt + 20°) + 1.5 sin (3ωt + 10°). The elements are
If f(t) is in volts, then F(jω) is in
If F(t) = δ(t - a), F(s)=
X and Y are two random variable and Z = X + Y. Let σx2, σy2 and σz2 be variance of X, Y and Z. Then
If f=0
Fourier transform of an external exponential ejW0t
If X(z) = (1 - az-1), and |a| < |z|, the initial value x0 is
Which one most appropriate dynamic system?
A voltage V(t) which is a Gaussian ergodic random process with a mean of zero and a variance of 4 volt2 is measured by a true rms meter. The reading will be
L [f(t - a)] = F(jω) e-jωa
When a complex voltage wave is applied to a capacitor the resulting current wave is more distorted than the voltage wave.
Fourier transform is defined for
The property is not valid for basic singularity function is
If i =+cos 500t - 3.5 sint, then in amplitude phasse form i =
The integral of a unit impulse is
An energy signal has G(f) =Its energy density spectrum is
The integral of k δ(t) is
The units of the spectrum obtained be Fourier transforming the covariance function of a stationery Stochastic Process is
If xk = ak and k < 0X(z) = - (1 - az-1)-1 with |z| < |a|
Magnitude Plot of a Composite signal x(t) = e2jt + e3jt is
Assertion (A): The conditions under which it is possible to write Fourier series of a periodic function are called Drichlet conditions.
Reason (R): If f(t) = - f(- t), it is refereed to as odd symmetry.
The ROC of sequence x[n] = (0.8)n ∪[n] + (0.4)n ∪[n]
The real part of complex frequency s corresponds to oscillations.
The z-transform of sequence x[n] = δ(n) is
For Binomial Distribution
Two rectangular waveforms of duration t1 and t2 seconds are convolved. What is the shape of the resulting waveform?
The function A est where s = s + jω represents
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