AP PGECET 2026 Electronics and Communication Engineering Question Paper is available for download here. Andhra University, Visakhapatnam on behalf of APSCHE conducted AP PGECET 2026 Electronics and Communication Engineering exam on April 29 in Shift 1. AP PGECET is a state-level entrance exam conducted online for admission into M.Tech./M.Pharm./Pharm.D (PB) courses.
- AP PGECET Question Paper consists of 120 questions divided into two sections- Mathematics and Engineering Domain Specific.
- Each correct answer answer carries 1 mark and there is no negative marking for incorrect answer.
Candidates can download AP PGECET 2026 Electronics and Communication Engineering Question Paper with Answer Key and Solution PDF from the links provided below.
AP PGECET 2026 Electronics and Communication Engineering Question Paper with Solutions
| AP PGECET 2026 Electronics and Communication Engineering Question Paper | Download PDF | Check Solution |
The number of nodes in a graph having 5 branches and 2 independent loops is
For the given circuit, the values of \(R_{th}\) across the terminal AB and \(V_{th}\) are and , respectively.
If a Delta circuit has branches \(R_{ab} = 10\ \Omega\), \(R_{bc} = 20\ \Omega\), and \(R_{ca} = 30\ \Omega\), what is the equivalent Wye resistor \(R_a\) connected to node?
In sinusoidal steady-state analysis, which of the following best describes the use of phasors?
What does the Laplace transform do the differential equation of an RLC circuit?
For a symmetrical two-port network, which of the following is NOT necessarily true?
Which of the following best describes the band structure of intrinsic silicon?
The primary characteristic of a tunnel diode is its {1cm}.
At very high electric fields in silicon, the drift velocity of electrons becomes independent of the electric field. This phenomenon is known as:
In an n-channel JFET, if the gate voltage is made more negative than the pinch-off voltage, what happens to the drain current?
Which of the following is a characteristic of the MOS capacitor?
What distinguishes the light emitted by a LASER diode from an LED?
In silicon IC fabrication, 'Dry Oxidation' is generally preferred over 'Wet Oxidation' for growing:
In a MOSFET small-signal model, if the drain current is doubled while maintaining the same device dimensions, the trans-conductance will:
A positive clamper circuit with a 10V DC source is fed with a 20V p-p sinusoidal input. What is the minimum DC voltage level at the output?
A negative feedback amplifier has an open-loop gain of 100 and a feedback factor \(\beta = 0.09\). If the open-loop gain changes by 10% due to aging, what is the percentage change in the closed-loop gain of the amplifier?
In an op-amp, which of the following best describes the ‘virtual short’ concept?
A two-stage RC-coupled amplifier has stage-1 lower cutoff frequency \(f_{L1} = 100 Hz\) and stage-2 lower cutoff frequency \(f_{L2} = 1 kHz\). The overall lower cutoff frequency of the amplifier is approximately:
Which of the following is a common application of a 555 timer in monostable mode?
A full-wave rectifier has a load resistor of \(1 k\Omega\) and a capacitor of \(100\ muF\). Doubling the load resistor will .
The minimal SOP expression for a 3-variable function having \(m\) in terms of \(\sum m(1,3,5,7)\) is
The logic family which is least affected by temperature variations, is
In a positive edge-triggered \(JK\) flip-flop, the \(J\) input is connected to \(\bar{Q}\) (inverted output) and the \(K\) input is connected to \(Q\) (normal output). If the flip-flop is initially in the RESET state (\(Q=0, \bar{Q}=1\)) and is subjected to 4 consecutive positive clock pulses, what will be the final state of \(Q\)?
If a sample and hold circuit is not used with an ADC, the result may be _______.
A ring counter (with 4 flip-flops) has how many unique states?
Signal distortionless transmission through an LTI system requires:
The frequency response magnitude of a DT-LTI system tends to infinity when
What is the primary difference between CTFT and DTFT?
In a causal and stable LTI system, the impulse response \(h(t)\) must satisfy which condition ?
What is the Fourier Transform of a Gaussian function \(e^{-t^2}\) ?
In FFT computation, reducing complexity from \(O(N^2)\) to \(O(N \log_2 N)\) relies fundamentally on _______.
If the impulse response of a discrete-time LTI system is finite in length, which property is always guaranteed?
For a discrete-time periodic signal with period \(N\), how many distinct Fourier coefficients exist?
The open loop transfer function of a unity feedback system is \(G(s) = \frac{10}{s(s+2)}\), what is the steady state error for a unit step input?
A second order system has \(\omega_n = 4 rad/sec\) and \(\zeta = 0.5\). What is the damped natural frequency \(\omega_d\) ?
The characteristic equation of a system is \(s^3 + 3s^2 + 3s + 1 = 0\). How many poles lie in the right half plane?
If the open-loop transfer function \(G(s)H(s)\) has one pole in the right-half of the \(s\)-plane, for the closed-loop system to be stable, the Nyquist plot must encircle the \((-1, j0)\) point _______.
A phase-lead compensator is primarily used to _______.
Which part of a PID controller is specifically responsible for eliminating the steady-state error?
For the state equation \(\dot{x} = 3x\) , the system is _______.
Gain cross over frequency is the frequency at which _______.
What is the primary advantage of using a super-heterodyne receiver?
Which of the following digital modulation schemes has the lowest probability of error at a given SNR?
Which of the following is a salient feature of GSM _____.
In a coherent BPSK modulation scheme, if the input bit rate is doubled while keeping the symbol energy as constant, what is the effect on the transmission bandwidth (\(BW\)) and the probability of bit error (\(P_e\))?
A Gaussian noise channel has a bandwidth of \(4 kHz\) and a signal-to-noise power ratio (SNR) of \(15\). According to the Shannon-Hartley theorem, what is the maximum capacity of this channel?
The total average power of a signal equals:
For a WSS random process, the autocorrelation \(R_x(\tau)\) as \(\tau \rightarrow \infty\) approaches:
The skin depth in a conductor is:
Which of the following statements is NOT true about Maxwell's equations in differential form?
The radiation pattern of a dipole antenna is characterized by,
The Poynting vector in electromagnetic theory represents,
Which of the following is the primary condition that must be satisfied at the boundary of a perfect electric conductor (PEC) for an electromagnetic wave?
Find current \(i_2\) in the shown network
For every tree there will be ______ number of cut set matrices.
In the circuit shown, find the current through \(4\Omega\) resistor using Superposition theorem.
Find the voltage at node P, shown in the figure.
In an R-C circuit, when the switch is closed, the response _______.
What type of semiconductor is used in LED ?
The voltage equivalent of temperature (\(V_T\)) in a \(p-n\) junctions is given by
The application of a CC configured transistor is _________.
What is the behaviour of a PIN diode under reverse bias?
What is the role of input capacitance in the transistor amplifying circuit?
Given that \(R1=20k\Omega\), \(C1=2nF\), \(R2=20k\Omega\), \(C2=2nF\), find the approximate resonant frequency of a Wein bridge oscillator.
Which among the following can be used to detect the missing heart beat?
In a low pass filter as below, find the cut-off frequency for the following circuit. Given that \(R1=20k\Omega\), \(R2=25k\Omega\), \(C1=10muF\).
Which component is used to reduce ripples in a DC power supply?
Which of the following options comes under the non-saturated logic family?
The result ``\(X + XY = X\)'' follows which of these laws?
The device shown here is most likely a _________.
How many select lines would be required for an 8-line-to-1-line multiplexer?
Which of the following is a register-indirect addressing mode instruction set?
Find the ROC of \(x(t) = e^{-2t} u(t) + e^{-3t} u(t)\).
Which of the following systems is memoryless?
Find the convolution sum of sequences \(x_1[n]=\{1,2,3\}\) and \(x_2[n]=\{2,1,4\}\).
The total number of complex multiplications required to compute an \(N\)-point DFT using the Radix-2 FFT algorithm is
The transfer function from D(s) to C(s) is _________. Given \(G(s) = \frac{2}{3s+1}\) and \(H(s) = 3\)
The greater the Gain Margin in the control system, the greater is its _________.
The system with the open loop transfer function \(\frac{1}{s(1+s)}\) is:
{}PD controller:
Calculate power in each sideband, if power of carrier wave is 176W and there is 60% modulation in amplitude modulated signal?
In flat top sampling scheme, _______ is kept constant after sampling.
The matched filter is equivalent to which of the following?
Which access technique is primarily used in the Global System for Mobile communications (GSM)?
The cut off frequency of the dominant mode in a TE wave in the line having a and b as 2.5 cm and 1 cm respectively is,
Fresnel zone is also called as _________.
What does the parameter \( S_{11} \) represent in a two-port network?
An amplifier without feedback has a voltage gain of 50, input resistance of 1 k\(\Omega\) and output resistance of 2.5 k\(\Omega\). The input resistance of the current-shunt negative feedback amplifier using the above amplifier with a feedback factor of 0.2, is
To double the drain current of an N-channel enhancement mode MOSFET biased in saturation {1cm}.
The MUX shown in fig is \( 4 \times 1 \) multiplexer. The output Z is \[ \]
The initial contents of the 4-bit serial-in-parallel out right-shift register shown in figure is 0110. After three clock pulse applied, the contents of the shift register will be \[ \]
The contents of accumulator after the execution of following instruction will be
MVI A, B7H
ORA A
RAL
Consider the circuit, the next state \( Q^+ \) is \[ \]
A system is described by the differential equation \( \frac{d^2y(t)}{dt^2} + 6\frac{dy(t)}{dt} + 5y(t) = x(t) \). Impulse response of the system is
The Fourier transform of a real valued time signal has {1cm}.
Consider a causal LTI system with frequency response \( H(j\omega) = \frac{1}{j\omega + 3} \). This system produces the output to an input \( x(t) \) as \( y(t) = e^{-3t}u(t) - e^{-4t}u(t) \). The input \( x(t) \) is
The convolution of two DT sequence is,
\( x(n) = \{1 \uparrow, 2, 0, 1\} \)
\( h(n) = \{2, 2, 3\} \)
The value of K for which the unity feedback system \( G(s) = \frac{K}{S(S+2)(S+4)} \) crosses the imaginary axis is
A unity feedback second order system has \( G(s) = \frac{100}{S^2+10S+100} \). The 2% settling time is in second.
What is the transfer function for given bode plot shown in the figure? \[ \]
Consider the unity feedback system with \( G(s) = \frac{2}{S(S+1)(2S+1)} \). what is the phase margin?
Overall gain of the system shown in the figure is:
The carrier \( c(t) = A\cos(2\pi \times 10^6 t) \) is angle modulated (PM or FM) by the signal \( m(t) = 2\cos(4000\pi t) \). The deviation constants are \( k_p = 3\,rad/V \) & \( k_f = 3000\,Hz/V \). The value of modulation indices \( \beta_f \) & \( \beta_p \) are:
A binary channel with bit rate of 56kbps is available for uniform PCM voice transmission having signal bandwidth of 3.4kHz. The signal-to-noise ratio in decibels is:
A binary signal is transmitted at 10kbps using NRZ signaling. Find the minimum channel bandwidth required in KHz:
In a DPSK system the input bit sequence is 1101, initial phase = 0. The transmitted phase sequence is:
For electrostatic fields in charge free atmosphere, which one of the following is correct?
In a non-magnetic medium electric field \( E = E_0\cos\omega t \) is applied. If the permittivity of the medium is \( \varepsilon \) and the conductivity is \( \sigma \) then the ratio of the amplitudes of the conduction current density and displacement current density will be:
If maximum and minimum voltage on a transmission line are 2V and 5V respectively, VSWR is:
If a transmission line of characteristic impedance \( 25\,\Omega \) is to be matched to a load of \( 100\,\Omega \), then the characteristic impedance of the \(\lambda/4\) transmission line to be used is:
Let A be a \( 3 \times 3 \) matrix with real entries such that \(\det(A) = 6\) and \(trace(A) = 0\). If \(\det(A + I) = 0\), where I is the \( 3 \times 3 \) identity matrix, then the eigenvalues of A are:
Consider the following system of equations: \[ x - 2y + 3z = -1 \] \[ x - 3y + 4z = 1 \] \[ -2x + 4y - 6z = k \]
The value of \( k \) for which the system has infinitely many solutions is ____.
The value of the improper integral \( \int_{-\infty}^{0} \frac{e^x}{e^{2x} + 1} \, dx \) is equal to ____.
Suppose C is the closed curve defined as the circle \( x^2 + y^2 = 1 \) with C oriented anti-clockwise. The value of the line integral \( \oint_C (x \, dy - y \, dx) \) is equal to ____.
The general solution of the differential equation \( x^2 \frac{d^2y}{dx^2} - 5x \frac{d5y}{dx} + 13y = 0 \) is _____.
Let S be the surface of the cube bounded by \( x = 0, x = 1, y = 0, y = 1, z = 0, z = 1 \). The value of the surface integral \( \iint_S \vec{F} \cdot d\vec{s} \) of a vector field \( \vec{F} = 4xz\hat{i} - y^2\hat{j} + yz\hat{k} \) over the entire surface S of the cube, is _____.
The value of the integral \( \int_C \frac{e^z}{z^3} \, dz \), where \( C : |z| = 1 \) is ____.
The coefficient of \( \frac{1}{z} \) in the Laurent's series expansion of the function \( f(z) = \frac{1}{z^2(1-z)} \) about \( z = 0 \), is ____.
Suppose that X has the density function \( f(x) = cx^2 \) for \( 0 \le x \le 1 \) and \( f(x) = 0 \) otherwise. What is \( P(0.1 \le X \le 0.5) \)?
Consider the function \( f(x) = x^3 - x - 1 \) for finding the root of the equation \( f(x) = 0 \). If the initial approximation is \( x_0 = 1 \), then the next approximation \( x_1 \) using the Newton--Raphson method is:
AP PGECET 2026 Electronics and Communication Engineering Topic-wise Weightage
| Major Subject | Approx. Number of Questions | Expected % (Approx.) |
|---|---|---|
| Engineering Mathematics | 12–18 | 10–15% |
| Analog Circuits | 12–16 | 10–13% |
| Digital Circuits | 12–16 | 10–13% |
| Signals & Systems | 10–14 | 8–12% |
| Communication Systems | 14–18 | 12–15% |
| Control Systems | 10–14 | 8–12% |
| Electromagnetics | 8–12 | 7–10% |
| Networks | 8–12 | 7–10% |
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