List of top Questions asked in AP PGECET- 2025

Surging is a phenomenon associated with:
What type of filtration relies on gravity to pull liquid through the filter medium?
If a combustion, 4 kg of organic compound gives 11 kg of CO$_2$, the percentage of carbon in the compound will be _________
Filter aids are added to the slurry prior to filtration in order to form ________
Pick the best difference between mixing and blending.
For transportation of boiler ash, which one of the following conveyors will be useful?
Centrifugal pumps transfer energy from _________
Which of the following equation must be perfunctorily satisfied while dealing with fluid flow problems?
Using Newton-Raphson method to solve $f(x) = e^{-x} - x$ with initial guess $x_0 = 0$, find the next iteration.
The solution of the differential equation
\[ (D^3 - 5D^2 + 7D - 3)y = e^{-2x} \] is:
If $I = \frac{1}{2\pi i} \oint \frac{z e^{1/z}}{z} \, dz$ in the unit circle $|z| = 1$, then:
The given differential equation
$(x y^2 + n x^2 y) dx + (x^3 + x^2 y) dy = 0$ is exact when $n =$
If \( A = \begin{pmatrix} 1 & -1 \\ 2 & 3 \end{pmatrix} \) is a \( 2 \times 2 \) matrix, then the eigenvalues of the matrix \( 2A^2 - 4A + 5I \) are ______, where \( I \) is the \( 2 \times 2 \) unit matrix.

Find the current through 3 ohm resistor using superposition theorem

 

Consider a three-core, three-phase, 50 Hz, 11 kV cable whose conductors are denoted as R, Y and B in the given figure. The inter-phase capacitance (C1) between each pair of conductors is 0.2 $\mu$F and the capacitance (C2) between each line conductor and the sheath is 0.4 $\mu$F.

 

The bus impedance matrix of a 4-bus power system is given.

A branch having an impedance of \( j0.2 \Omega \) is connected between bus 2 and the reference. Then the values of \( Z_{22,new} \) and \( Z_{23,new} \) of the bus impedance matrix of the modified network are respectively _______.

 

In an inverting RC integrator using an Op-amp, \( RC = 1\,\text{s}, \, V_i = 5\,\text{V} \), then \( V_o = \, \_\_\_\_\_\_\_ \)

For the figure below, \( x(t) \) and \( y(t) \) are related as _______.

 

Which of the following signals are periodic?
\[ x(t) = \sin t + \cos 2\pi t \\ y(t) = \sin 2\pi t + \sin 5t \\ z(t) = \sin t + \cos \pi t \]

When the input to Q is a 1 level, the frequency of oscillations of the timer circuit is _______.

 

The logic circuit given below converts a binary code \(Y_1, Y_2, Y_3\) into _______.

 

An ammeter has a current range of 0–5 A, and its internal resistance is 0.2 Ω. In order to change the range to 0–25 A, we need to add a resistance of ________.

The bus admittance matrix of the network shown in the given figure, for which the marked parameters are per unit impedance, is _______.

 

A transformer has a core loss of 64 W and copper loss of 144 W. When it is carrying 20% over load current, the load at which this transformer will operate at the maximum efficiency is _______.
The number of roots of $s^3 + 5s^2 + 7s + 3 = 0$ in the right half of the s-plane is _______.