Electronics (ECE) - MCQ Practice Questions

In a Wien bridge oscillator, what is the condition for sustained oscillation?

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 linear phase FIR filter of length N has which characteristic for group delay?

A speech signal is band-limited to 4 kHz and sampled at 8 kHz. If 1000 samples are collected, what is the frequency resolution of its DFT?

A system with H(s) = (s+2)/((s+1)(s+3)) is analyzed. What is the steady-state response to u(t) = 10sin(2t)?

In multirate signal processing, if a signal is decimated by factor M and then interpolated by factor M, what is the output relationship to input?

A minimum-phase system has a zero at z = 2. Where should its mirror zero be placed for a linear-phase equivalent system?

A signal undergoes spectral analysis using FFT with windowing. If spectral leakage is observed, which of the following is NOT a solution?

A continuous-time system H(s) = 10/(s+2) is converted using bilinear transformation with T=0.1s. The resulting discrete system pole location is at:

For a system with impulse response h[n] = δ[n] + 2δ[n-1], the frequency response magnitude at ω = π is:

For a complex exponential signal e^(j2πf₀t) sampled at fs = 10 kHz with f₀ = 3 kHz, aliasing occurs at frequency:

A second-order system has poles at s = -1 ± j2. Its natural frequency ωn is:

A causal stable filter has H(s) = (s+3)/((s+1)(s+2)). Using partial fractions, the impulse response contains:

A 1024-point FFT is computed on a signal. The frequency resolution is 0.1 Hz. What is the sampling frequency?

For a linear time-invariant system with Laplace transform H(s) = 1/(s+2), determine the response to input x(t) = e^(-2t)×u(t):