List of top Electronics and Communication Engineering Questions asked in Andhra Pradesh Post Graduate Engineering Common Entrance Test

Which of the following system is not stable with input \( x(n) \) and output \( y(n) \)?
If \( x[n] = \{1, 0, -2, 3\} \) and \( y[n] = x[n] \ast x[n] \), the maximum value of \( y[n] \) is
As \( x \) is increased from \( -\infty \) to \( \infty \), the function \( f(x) = \frac{e^x}{1+e^x} \) behaves as
A discrete-time signal \( x[n] = \sin(\pi n^2) \), where \( n \) is an integer, is
Find the initial value, if it exists of the signal with Laplace transform given below:
\[ X(s) = \frac{s + 4}{s^2 + 3s + 5} \]
A PAM signal can be detected by using
The primary function of a clamper circuit is
A function \( x(t) \) is said to have half-wave odd symmetry if
The impulse response of a continuous time system is given by \( h(t) = \delta(t - 1) + \delta(t - 3) \). The value of the step response at \( t = 2 \) is
One example of the use of an S-R flip-flop is
What is the period of the following signal, \( x(t) = \sin(18\pi t + 78^\circ) \)?
What are the conditions called which are required for a signal to fulfill to be represented as Fourier series?
The logic function implemented by the circuit shown in the Figure below is (ground implies a logic '0')
logic function implemented
A 10-bit successive approximation type A/D converter has quantization error of 10 mV. The digital output corresponding to an analog input of 4.365 V would be
The minimum number of comparators required to build an eight-bit flash ADC is
For a square wave signal with a frequency of 10 KHz, calculate the output frequencies for Mod 2, Mod 4, and Mod 10 counters.
The logic circuit shown in Figure below is a
logic circuit
The number of memory cycles required to execute the following 8085 instructions
I. STA 3000 H
II. LXI D, 3000 H
\( A + A.B + A.B.C + A.B.C.D \) simplifies to
An amplifier has \( A_v = 1000 \pm 100 \). Determine the feedback needed to keep the gain within \( \pm 10\% \).
Which of the following circuit is used as a special signal to demultiplex the address bus and data bus?
How to achieve 50\% duty cycle in adjustable rectangular wave generator? (Assume \( R_1 \) is Resistor connected between supply and discharge and \( R_2 \) is Resistor connected between discharge and trigger input.)
The decimal equivalent of \( (101111.1101)_2 \) is
The number of memory cycles required to execute the 8085 instruction LDA 3000 H is
Simplify the following expression with A, B, C three variables, \( F(A, B, C) = \Sigma(1, 3, 5, 7) \)