Electronics (ECE) - MCQ Practice Questions

A continuous-time signal x(t) = 5cos(2πt + π/4) has a fundamental frequency of:

Which of the following is a causal system?

The Fourier transform of a rectangular pulse rect(t/T) is:

A system is BIBO stable if:

The energy of signal x(t) = e^(-2t)u(t) is:

Which property does NOT apply to the Laplace transform?

A signal x[n] is time-reversed to get x[-n]. This operation is:

The Z-transform of x[n] = aⁿu[n] is:

Nyquist sampling rate for a signal with maximum frequency 5 kHz is:

For a discrete-time LTI system with H(z) = 1/(1-0.5z⁻¹), the ROC should be:

The convolution of two sequences is commutative, meaning:

A signal is called energy signal if:

The inverse Fourier transform of δ(f-f₀) is:

For a real signal x(t), its Fourier transform X(f) satisfies:

A system with H(z) = (z-0.5)/(z-0.8) has:

Which window function has the BEST frequency resolution but WORST spectral leakage?

Parseval's theorem states that energy in time domain equals energy in frequency domain. For discrete signals:

For a stable IIR filter with difference equation y[n] = 0.5y[n-1] + x[n], the DC gain is:

The concept of 'group delay' in filters refers to:

A continuous-time signal x(t) = e^(-2t)u(t) is applied to a system. What is the Laplace transform X(s)?