List of top 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
The primary function of a clamper circuit is
What is the period of the following signal, \( x(t) = \sin(18\pi t + 78^\circ) \)?
A PAM signal can be detected by using
A function \( x(t) \) is said to have half-wave odd symmetry if
What are the conditions called which are required for a signal to fulfill to be represented as Fourier series?
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
\( A + A.B + A.B.C + A.B.C.D \) simplifies to
The minimum number of comparators required to build an eight-bit flash ADC is
The logic function implemented by the circuit shown in the Figure below is (ground implies a logic '0')
logic function implemented
The number of memory cycles required to execute the following 8085 instructions
I. STA 3000 H
II. LXI D, 3000 H
The logic circuit shown in Figure below is a
logic circuit
For a square wave signal with a frequency of 10 KHz, calculate the output frequencies for Mod 2, Mod 4, and Mod 10 counters.
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
An amplifier has \( A_v = 1000 \pm 100 \). Determine the feedback needed to keep the gain within \( \pm 10\% \).
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.)
Simplify the following expression with A, B, C three variables, \( F(A, B, C) = \Sigma(1, 3, 5, 7) \)
The decimal equivalent of \( (101111.1101)_2 \) is
Which of the following circuit is used as a special signal to demultiplex the address bus and data bus?
The number of memory cycles required to execute the 8085 instruction LDA 3000 H is
The POS form is suitable for circuits using
If the input to a comparator is a sine wave, the output is
In the silicon BJT circuit shown below, assume that emitter area of transistor Q1 is half that of transistor Q2, then what is the value of the current \( I_o \) is approximately
silicon BJT circuit
Three identical amplifiers with each one having a voltage gain of 50, input resistance of 1 kΩ and output resistance of 250 Ω are cascaded. The open circuit voltage gain of the combined amplifier is