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

In a short transmission line, voltage regulation is zero only when the load at the receiving end operates at:
The supply voltage to an induction motor is reduced by 10%. By what percentage approximately will the maximum torque decrease?
The Surge Impedance of a 3-Phase 400kV transmission line is 400ohm. The Surge Impedance Loading (SIL) is:
What is the frequency of rotor current of a 50Hz induction motor operating at 2% slip?
A 3-phase induction motor is operated with rotor blocked, its power factor is:
A 4kVA, 400V/200V single-phase transformer has resistance of 0.02 pu and reactance of 0.06 pu. The resistance and reactance referred to HV side are:
The direction of rotation of a DC series motor can be reversed:
(I) By interchanging supply terminals
(II) By interchanging field terminals
The full load copper-loss and iron-loss of a transformer are 6400 W and 5000 W respectively. The copper-loss and iron-loss at half full-load will be:
A 20KVA, 2000/200 V single-phase transformer has name-plate leakage impedance of 8%. The voltage required to be applied on the HV side to circulate full load current with the LV winding short-circuited will be:
Which of the following machines run at very low speed (<100 rpm):
The purpose of using inter-poles in large DC machines is to nullify:
When a synchronous motor is operating at normal excitation, its operating power factor is:
Kramer system for controlling the speed of a 3-phase induction motor is mostly used for motors of:
If \( x(t) \) is a causal signal, then for \( t < 0 \):
The time system which operates with a continuous time signal and produces a continuous time output signal is:
The trigonometric Fourier series of an even function of time does not have:
To implement armature voltage control, it must be ensured that:
Ward-Leonard system of speed control is not recommended for:
Find the inverse Fourier transform of \( e^{j2\pi t} \):
A DC series motor is accidentally connected to a single-phase AC supply. The torque produced will be:
Which of the following theorems is the dual of Norton’s theorem?
Forced response is the solution of the difference equation when:
Heating element of an electric iron is normally made-up of:
If the current density inside a straight conductor is uniform over its cross-section, the flux density variation inside the conductor at different distances from its centre is:
The system \( y(t) = x(2t) + 3 \) is: