Electronics (ECE) - MCQ Practice Questions

For a periodic signal x[n] with period N=4, the DFT X[k] has X[0]=8. The average value of the signal is:

A continuous-time signal x(t) is band-limited to 15 kHz. Using ideal reconstruction from samples, the minimum sampling frequency required is:

The DTFT of x[n] = δ[n-3] is:

For a Laplace transform H(s) = 5/(s+3), the system impulse response is:

The convolution of two signals each of length 5 using linear convolution yields an output of length:

A system with transfer function H(s) = (s+2)/(s²+3s+2) has poles at:

A continuous-time signal x(t) = 5sin(100πt) is sampled at 150 Hz. What is the Nyquist frequency required to avoid aliasing?

Which property of the Fourier transform states that multiplication in time domain equals convolution in frequency domain?

A causal LTI system has impulse response h(t) = e^(-3t)u(t). Is this system stable?

The Z-transform of x[n] = ($\frac{1}{2}$)^n u[n] is:

An even signal x(t) has Fourier transform X(f). What can be said about X(f)?

The energy of a signal x[n] = {1, 2, -1, 0} is:

The Z-transform of a discrete-time signal is X(z) = z/(z-0.5) with ROC |z| > 0.5. The corresponding time-domain signal is:

A first-order low-pass filter has transfer function H(s) = ωc/(s + ωc). At what frequency (in terms of ωc) does the magnitude response drop to 1/√2 of its DC value?