List of top Electronics and Communication Engineering Questions

The number of bits per sample in a PCM system with sinusoidal input is increased from n to n+1. The improvement in signal to quantization noise ratio will be
Which of the following modulation scheme gives the maximum probability of error?
The input to a matched filter is given by \( S(t) = 10 \sin(2\pi \times 10^6 t), 0<t<1 \) second. The peak amplitude of the filter output is (Note: The duration \(0<t<1\) second is very long for a 1 MHz signal. This implies many cycles. Energy of the signal will be large.)
As the bandwidth approaches infinity, the channel capacity becomes (Referring to Shannon-Hartley theorem: \(C = B \log_2(1 + S/N)\))
Which one of the following is true?
Which of the following is incorrect? (Assuming H refers to Entropy in Information Theory)
A DSB-SC signal can be demodulated using
The image channel rejection in superheterodyne receiver comes from
The figure of merit ratio of FM to PM for single tone modulating signal is
A narrowband FM does not have the following feature
The maximum permissible distance between two samples of a 2 kHz signal is
The main advantage of TDM over FDM is
Companding is used in PCM to
The positive RF peaks of an AM voltage rise to maximum value of 12V and drop to a minimum value of 4V. Assuming single tone modulation, the modulation index is
The plot of modulation index versus carrier amplitude yields a
The state model is _____, the transfer function of the system is ____
The limit cycles describe the ____ of non-linear systems
The characteristic equation of a control system is given by \( s(s+1)(s^2+2s+1)+k(s+2)=0 \). The angles of asymptotes of the root loci are
Thermal noise is independent of
If the contour of the open-loop transfer function G(s)H(s) corresponding to the Nyquist contour in the s-plane encircle to the point ____, the closed loop system is stable (The blank should be the critical point \((-1+j0)\) or just \(-1\).)
The main advantage of Bode plot is to
Consider an open-loop unstable system with the transfer function \( G(s)H(s) = \frac{s+2}{(s+1)(s-1)} \) when the feedback path is closed, then the system is
The gain cross over frequency is the frequency at which the \(|G(s)H(s)|\) is (Note: s should be \(j\omega\) for frequency response magnitude) \(|G(j\omega)H(j\omega)|\)
Addition of a pole at the origin to a transfer function rotates the polar plot at zero and infinite frequencies by a further angle of
Which of the following is not correct with respect to Phase Lead Compensator?