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

When the firing angle \( \alpha \) of a single phase, fully controlled rectifier feeding a constant DC current into a load is \( 30^\circ \), the displacement power factor of the rectifier is _______.
A DC chopper operates on 230 V DC and frequency of 400 Hz, feeds an R-L load. If the output voltage of chopper is 150 V, the ON time of the chopper is _______.
The initial value of \( x[n] \) is _______, if \[ X(z) = \frac{3z^2}{(z+3)(z-3)} \]
In a three-phase full wave AC to DC converter, the ratio of output ripple frequency to the supply voltage frequency is _______.
Two binary signals ‘a’ and ‘b’ are to be compared. When two signals are equal, then output expression is _______.
Turn-on time of an SCR can be reduced by using a _______.
A discrete-time signal \( x[n] = \sin(\pi^2 n) \), \( n \) being an integer, is ________.
If \( R_1 \) is the region of convergence of \( x(n) \) and \( R_2 \) is the region of convergence of \( y(n) \), then the region of convergence of \( x(n) * y(n) \) is _______.
The discrete system \( y[n] = x[n-3] - 4x[n-7] \) is a _______.
Determine the fundamental period of the signal \( \cos\left(\frac{\pi}{4}t\right) + \sin\left(\frac{\pi}{3}t\right) \).
The ratio error of a CT is due to ________.
If the fault current is 2000 A, the relay setting is 50% and the CT ratio is 400/5, then the plug setting multiplier will be ________.
NAND and NOR gates are called ________.
Ohm’s law relates the current density \( J \) with field intensity \( E \) as _______.
If the accumulator of an Intel 8085A microprocessor contains 37 H and the previous operation has set the carry flag, the instruction ACI 56 H will result in ________.
When bundle conductors are used in place of single conductors, the effective inductance and capacitance will respectively _______.
A Wheatstone bridge requires a change of 6 ohms in the unknown arm of the bridge to produce a change in deflection of 3 mm of the galvanometer. The sensitivity of the instruments is ________.
Phantom loading for testing of energy meter is used _______.
Which one of the following is the main cause of creeping in the induction type energy meters?
Induction type single phase energy meter is ________.
The material most preferred for control spring is ________.
The steady state stability limit of a synchronous generator can be increased by _______.
The positive, negative, and zero sequence impedance of a solidly grounded system under steady state condition always follow the relation ________.
A relay used on long transmission lines is ________.
If the reference bus is changed in two load flow runs with same system data and power obtained for reference bus taken as specified P and Q in the later run: _______.