List of top Electronics and Communication Engineering Questions

Match the following with respect to region of convergence
\( x(n) \) ROC
AInfinite duration causal sequenceIEntire z-plane except at \( z = 0 \)
BFinite duration causal sequenceIIEntire z-plane except at \( z = \infty \)
CInfinite duration anticausal sequenceIII\( |z| > \alpha \), exterior of a circle of radius \( \alpha \)
DFinite duration anticausal sequenceIV\( |z| < \beta \), interior of a circle of radius \( \beta \)
Unilateral Z transform of x(n) is equivalent to bilateral Z-transform of
For a system to be physically realizable, the degree of numerator polynomial M and the degree of denominator polynomial N should be
The continuous time system structure which uses minimum number of integrators is
The frequency response of LTI system is given by the Fourier Transform of the \_____ of the system.
The exponential Fourier series coefficient \( C_{-n} \) in terms of trigonometric Fourier coefficients is
The amplitude and phase spectrum of exponential Fourier Series about vertical axis respectively, is
Which of the following statement is not correct?
The Fourier transform of the following signal is \[ x(t) = \begin{cases} 1+\cos \pi t & |t|<1 \\ 0 & |t|>1 \end{cases} \]
Consider a causal LTI system with impulse response \( h(t) = e^{-bt}u(t) \). Find the output of the system for an input \( x(t) = 3e^{-at}u(t) \).
Which of the following system is non-causal sytem? (Typo: "sytem" should be "system")
In QAM, both ______ of a carrier frequency are varied.
The following multiplexer gives the logic gate of a/an _____
multiplexer gives the logic gate
How many minimum number of flip-flops are required to make a mod-479 counter?
_____ is used for the removal of SiO2 from desired regions such that the desired impurities can be diffused.
The characteristic equation of JK flip-flop is ______
The number of flip-flops used in a decade counter is _____
The purpose of using a transmission line segment with a length of \( \lambda/4 \) in impedance matching is
Fundamental principle behind the propagation of light in dielectric waveguides and optical fibers is
What is the radiation pattern of a point source antenna in free space?
The primary advantage of using a rectangular waveguide over other transmission line types is
In a transmission line with a characteristic impedance \( Z_0 \), what happens if the load impedance \( Z_L \) matches \( Z_0 \)?
Which one of the following field patterns represents a TEM wave traveling in the positive \( z \)-direction?
Which of the following is not a source of magnetostatic fields?
Which of the following assertions accurately describes Gauss's theorem?