GPSC AE (Electrical) Class-2 R&B Department Paper 2025 – Series M with Answers

Which of the following is a correct representation of peak value in an AC circuit?

What is the direction of the electric field at a point?

What is the number of primary turns in a 200/1000V transformer if the emf per turn is 10V?

How many electrons will constitute 2 Coulombs of electric charge?

How does induced emf in DC motor react to supply voltage?

How many cycles will an AC signal make in 2 seconds if its frequency is 100Hz?

What will be the current density of a metal if a current of 30A is passed through a cross-sectional area of 0.5m2?

A substance whose relative permeability is less than the permeability of free space is _____________.

Diamagnetic substances have relative permeability _____________.

What happens to the MMF when the magnetic flux decreases?

Can we apply Kirchhoff’s law to magnetic circuits?

KCL is based on the fact that

Power dissipation in ideal inductor is

To obtain wide bandwidth, network is designed with which of the following?

Find V_AB if i_AB = 5 A.

If 4 equations are required to describe a circuit by Mesh-Current method and there are n nodes, then how many branches are there in the network?

In a delta-connected load, the relation between line voltage and the phase voltage is

What is the relation between the unit impulse function and the unit ramp function?

Two coils having self-inductances of 1 mH and 2 mH are mutually coupled. The maximum possible mutual inductance is ___________

A coil has resistance R and inductance L. At ω = ∞, the phase angle between voltage and current is _____________

In the circuit shown below, find the Z-parameter Z₁₂.

Electromagnetic torque in rotating electrical machinery is present when ________

A 400-V, 1000-A, lap wound DC machine has 10 poles, 860 armature conductors. The number of conductors in the pole face to give full compensation if pole face covers 70% of pole span is

_________ test is used for determining the efficiency of a traction motor.

The air gap line represents _________

The active power delivered by an alternator will _______ when the prime mover input is increased for the alternator connected to infinite bus bar.

A synchronous machine has field winding on stator and polyphase armature winding on rotor. At steady state, which of the following is not true for its air gap field?

These days alternators are designed to have larger air gaps for __________.

An induction motor can be said analogous to _________

While conducting open circuit test and short circuit test on a transformer, status of low voltage and high voltage windings will be such that in ____________

A 2000/1000/500 three winding transformer is to be used as auto transformer with supply of 3000V. Two loads of 1050 kVA at 3500 V and other one at 180 kVA at 1000 V. The total kVA supplied will be

Two single phase transformers A and B are operating in parallel having different impedance and identical x/r ratio. Then __________

A vector is said to be solenoidal when its

Find the value of Stoke’s theorem for A = x i + y j + z k. The state of the function will be

Find the power, given energy E = 2J and current density J = x2 varies from x = 0 and x = 1.

Evaluate the surface integral ∫∫ (3x i + 2y j). dS, where S is the sphere given by x² + y² + z² = 9.

Three charged cylindrical sheets are present in three spaces with σ = 5 at R = 2m, σ = − 2 at R = 4m and σ = − 3 at R = 5m. Find the flux density at R = 3m.

The continuity equation is a combination of which of the two laws?

Calculate the potential of a metal plate of charge 28C and capacitance 12 mF.

Calculate the emf when the flux is given by 3sin t + 5cos t.

Find the inductance of a coil with permeability 3.5, turns 100 and length 2m. Assume the area to be thrice the length.

Calculate the conduction current density when the resistivity of a material with an electric field of 5 units is 4.5 units.

When can one logic gate drive many other logic gates in Digital Electronics?

Which of these error-detecting codes enables to find double errors in Digital Electronic devices?

If A and B are the inputs of a half adder, then the sum is given by __________

The systematic reduction of logic circuits is accomplished by _______________

How many inputs are required for a 1-of-10 BCD decoder?

What is the maximum possible range of bit-count specifically in n-bit binary counter consisting of ‘n’ number of flip-flops?

A 12 MHz clock frequency is applied to a cascaded counter containing a modulus-5 counter, a modulus-8 counter and a modulus-10 counter. The lowest output frequency possible is ________

A 4-bit ripple counter consists of flip-flops, where each have a propagation delay from clock to Q output of 15 ns. For the counter to recycle from 1111 to 0000, it takes a total of ________

A bidirectional 4-bit shift register is storing the nibble 1110. Its input is LOW. The nibble 0111 is waiting to be entered on the serial data-input line. After two clock pulses, the shift register is storing ________

The group of bits 10110111 is serially shifted (rightmost bit first) into an 8-bit parallel output shift register with an initial state 11110000. After two clock pulses, the register contains ____________

The output frequency related to the sampling interval of a frequency counter as _____________

Which type of device may be used to interface a parallel data format with external equipment’s serial format?

A 4-bit shift register that receives 4 bits of parallel data will shift to the ________ by ________ position for each clock pulse.

In the case of two-transistor model (T1 & T2) of GTO with anode−short, the anode−short is placed between the

A step-down delta-star transformer, with per-phase turns ration of 5, is fed from a 3-phase, 1100 V, 50 Hz source. The secondary of this transformer through a 3-pulse type rectifier feeds a R load of 10 Ω. Find the maximum value of the load current (phase).

In non-circulating current mode dual converters, the circulating current is avoided by

In the single−pulse width modulation method, the output voltage waveform is symmetrical about ____________ in the negative half cycle.

In the case of a single−pulse width modulation with the pulse width = 2d, to eliminate the nth harmonic from the output voltage

The AC voltage controllers are used in __________ applications.

In a N-stage sequence controller, each secondary is rated for __________

The single−phase mid-point type cycloconverter uses __________ number of SCRs.

Two six pulse converters used for bipolar HVDC transmission system are rated at 1000 MW, ± 200 kV. What is the DC transmission voltage?

A single−phase AC switch is used in between a 230 V source and load of 2 kW and 0.8 lagging power factor. Determine the rms current rating required by the SCR. Use the factor of safety = 2.

Choose the incorrect statement.

Which of the following signals is monotonic?

When is x(t) said to be non-periodic signal?

Determine the discrete−time signal: x(n) = 1 for n ≥ 0 and x(n) = 0 for n < 0.

For what values of k is the following system stable, y = (k² − 3k − 4)log(x) + sin(x)?

A 440 V, 50 Hz AC source supplies a series LCR circuit with a capacitor and a coil. If the coil has 100 mΩ resistance and 15 mH inductance, then at a resonance frequency of 50 Hz, the half power frequencies of the circuit are ______________

A signal e^(−at) sin (ωt) is the input to a real linear time invariant system. Given K and ∅ are constants, the output of the system will be of the form Ke^(−bt) sin (vt + ∅). The correct statement among the following is __________

A periodic square wave is formed by rectangular pulses ranging from −1 to +1 and period = 2 units. The ratio of the power in the 7th harmonic to the power in the 5th harmonic for this waveform is equal to ____________

When is Fourier convergence theorem applicable?

Which of the following waves has the highest value of peak factor?

Time constant of an inductive circuit

The impulse response of an LTI system which is continuous is H (t) = e−|t|. The system is ___________

Form factor is equal to peak factor in the case of

Which of the following reactances is eliminated first in synchronous generator just after the symmetrical fault?

A transmission line Z = (2 + j8) Ω has 10% of the voltage regulation with the lagging load of 0.8. If the load is 0.707 leading, then the V.R. is ________ (Assume the current is same in both cases)

A three−phase transformer having a line voltage ratio of 400/33000 V is connected in the star-delta. The CTs on the 400V side have a CT ratio of 1000/5. What must be the ratio of CTs on the 33000 side?

The neutral of the three phase 20 MVA, 11 kV alternator is earthed through a resistance of 5 ohms. The relay is set to operate when there is an out of balance current of 1.5 A. The CTs have a ratio of 100/5. What should be the minimum value of the earthing resistance to protect 90% of winding?

A single−phase motor is connected to 400V, 50Hz supply. The motor draws a current of 31.7A at a power factor 0.7 lag. The additional reactive power (in VAR) to be supplied by the capacitor bank will be ___________

An isolated generator is connected to a turbine with its continuous maximum power of 20 MW, 50 Hz. Generator is connected with two loads of 8 MW, each operates at 50 Hz. Generator has 5% droop characteristic. If an additional load of 6 MW is added, then frequency will be ___________

If all the sequence voltages at the fault point in a power system are equal, then fault is __________

The characteristic equation of a control system is given by s(s + 4)(s² + 2s + s) + k(s + 1) = 0. What are the angles of the asymptotes for the root loci?

The unit step response of a second order system is = 1 − e^(−5t) − 5t e^(−5t). Consider the following statements:
1. The under damped natural frequency is 5 rad/s.
2. The damping ratio is1.
3. The impulse response is 25t e^(−5t).
Which of the statements given above are correct?

Assertion (A): A PI controller increases the order of the system by units but decreases the steady state error.
Reason (R): A PI controller introduces a pole at either the origin or at a desired points on the negative real axis.

Assertion (A): Routh criterion is in terms of array formulation which is more convenient to handle.
Reason (R): This method is used to investigate the method of stability of higher order systems.

The auto-correlation function of a rectangular pulse of duration T is

The method of investigating the stability using Liapunov function is _____________

For a unity feedback system, the open loop transfer function is G(s) = K(s + 2)/s² (s² + 7s + 12). What is the type of system?

What is the response of the feedback function with open loop transfer function G(s) = 4/s(s + 5) and input is input step?

The open loop transfer function for a unit feedback system is G(s) = K/s(sT + 1). By what factor the amplitude gain K should be reduced so that the peak overshoot becomes 25% from 75%?

What is the need for a controller?

What is the vectored address of RST-5?

DAA instruction is used to perform which type of addition?

In the I/O mode, the 8255 ports work as

If the value of the pin STB (Strobe Input) falls to low level, then

When a stack segment is initialised, then

In mode 2, if N is loaded as the count value, then after (N − 1) cycles, the output becomes low for

If the zeroth condition is satisfied then, for execution, the JNZ instruction takes

The pin that clears the command, request and temporary registers and internal first/last flipflop when it is set is

The complete software system is divided into

The highest priority usage than any other usage is

A valid HOLD request is ascertained only after the completion of

The number of idle states (Ti), that is allowed between two INTA cycles, to meet the 8259A speed and cascade address output delay is

HVDC LCCs have ______________

Efficient LCC HVDC converters generally use __________