Previous Year Questions
1 paper · 44 questions — organised by subject with solutions and explanations.
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The op-amp shown in the figure is ideal. The input impedance is given by
In the circuit shown in the figure, the bipolar junction transistor (BJT) has a current gain . The base-emitter voltage drop is a constant, V. The value of the The venin equivalent resistance (in ) as
C onsider a unity feedback system with forward transfer function given by The steady-state error in the output of the system for a unit-step input is _________(up to 2 decimal places).
Match the transfer functions of the second-order systems with the nature of the systems given below.
The number of roots of the polynomial, , in the open left half of the complex plane is
The unit step response y(t) of a unity feedback system with open loop transfer function is shown in the figure. The value of K is _______ (up to 2 decimal places).
In the logic circuit shown in the figure, Y is given by
Digital input signals A,B,C with A as the MSB and C as the LSB are used to realize the Boolean function denotes the minterm. In addition, F has a don't care for . The simplified expression for F is gi
Which one of the following statements is true about the digital circuit shown in the figure
The graph of a network has 8 nodes and 5 independent loops. The number of branches of the graph is
In the figure, the voltages are , and . The circuit is in sinusoidal steady state, and . , and are the average power outputs. Which one of the following statements is true?
A DC voltage source is connected to a series L-C circuit by turning on the switch S at time t=0 as shown in the figure. Assume i(0)=0, v(0)=0. Which one of the following circular loci represents the p
The voltage v(t) across the terminals a and b as shown in the figure, is a sinusoidal voltage having a frequency =100 radian/s. When the inductor current i(t) is in phase with the voltage v(t), the ma
In the two-port network shown, the parameter (where, , when =0) in ohms is _____________ (up to 2 decimal places).
The voltage across the circuit in the figure, and the current through it, are given by the following expressions: where radian/s. If the average power delivered to the circuit is zero, then the value
Two wattmeter method is used for measurement of power in a balanced three-phase load supplied from a balanced three-phase system. If one of the wattmeters reads half of the other (both positive), then
A 0-1 Ampere moving iron ammeter has an internal resistance of 50 m and inductance of 0.1 mH. A shunt coil is connected to extend its range to 0-10 Ampere for all operating frequencies. The time const
A 3-phase 900kVA, , 50Hz transformer has primary (high voltage side) resistance per phase of 0.3 and secondary (low voltage side) resistance per phase of 0.02 . Iron loss of the transformer is 10 kW.
The equivalent circuit of a single phase induction motor is shown in the figure, where the parameters are , and s is the slip. At no-load, the motor speed can be approximated to be the synchronous spe
A separately excited dc motor has an armature resistance . The field excitation is kept constant. At an armature voltage of 100 V, the motor produces a torque of 500 Nm at zero speed. Neglecting all m
A transformer with toroidal core of permeability is shown in the figure. Assuming uniform flux density across the circular core cross-section of radius , and neglecting any leakage flux, the best esti
In a salient pole synchronous motor, the developed reluctance torque attains the maximum value when the load angle in electrical degrees is
A 200 V DC series motor, when operating from rated voltage while driving a certain load, draws 10 A current and runs at 1000 r.p.m. The total series resistance is 1 . The magnetic circuit is assumed t
A single-phase 100 kVA, 1000 V / 100 V, 50 Hz transformer has a voltage drop of 5% across its series impedance at full load. Of this, 3% is due to resistance. The percentage regulation of the transfor
The capacitance of an air-filled parallel-plate capacitor is 60 pF. When a dielectric slab whose thickness is half the distance between the plates, is placed on one of the plates covering it entirely,
A positive charge of 1 nC is placed at (0,0,0.2) where all dimensions are in metres. Consider the x-y plane to be a conducting ground plane. Take F/m. The z component of the E field at (0,0,0.1) is cl
A phase controlled single phase rectifier, supplied by an AC source, feeds power to an R-L-E load as shown in the figure. The rectifier output voltage has an average value given by where volts and is
Four power semiconductor devices are shown in the figure along with their relevant terminals. The device(s) that can carry dc current continuously in the direction shown when gated appropriately is (a
The figure shows two buck converters connected in parallel. The common input dc voltage for the converters has a value of 100 V. The converters have inductors of identical value. The load resistance i
The waveform of the current drawn by a semi-converter from a sinusoidal AC voltage source is shown in the figure. If =20 A, the rms value of fundamental component of the current is ___________A (up to
A single phase fully controlled rectifier is supplying a load with an anti-parallel diode as shown in the figure. All switches and diodes are ideal. Which one of the following is true for instantaneou
A dc to dc converter shown in the figure is charging a battery bank, B2 whose voltage is constant at 150 V. B1 is another battery bank whose voltage is constant at 50 V. The value of the inductor, L i
Consider a lossy transmission line with as the sending and receiving end voltages, respectively. Z and X are the series impedance and reactance of the line, respectively. The steady-state stability li
The series impedance matrix of a short three-phase transmission line in phase coordinates is . If the positive sequence impedance is , and the zero sequence is , then the imaginary part of (in ) is __
The per-unit power output of a salient-pole generator which is connected to an infinite bus, is given by the expression, , where is the load angle. Newton-Raphson method is used to calculate the value
A three-phase load is connected to a three-phase balanced supply as shown in the figure. If , and (angles are considered positive in the anti-clockwise direction), the value of R for zero current in t
The positive, negative and zero sequence impedances of a three phase generator are and respectively. For a line-to-line fault with fault impedance ,the fault current is , where is the fault current wi
The positive, negative and zero sequence impedances of a 125 MVA, three-phase, 15.5 kV, star-grounded, 50 Hz generator are j0.1 pu, j0.05 pu and j0.01 pu respectively on the machine rating base. The m
A 1000 x 1000 bus admittance matrix for an electric power system has 8000 non-zero elements. The minimum number of branches (transmission lines and transformers) in this system are _____ (up to 2 deci
Consider the two bus power system network with given loads as shown in the figure. All the values shown in the figure are in per unit. The reactive power supplied by generator and are and respectively
A continuous-time input signal x(t) is an eigenfunction of an LTI system, if the output is
Consider the two continuous-time signals defined below: , These signals are sampled with a sampling period of T=0.25 seconds to obtain discretetime signals , respectively. Which one of the following s
The Fourier transform of a continuous-time signal x(t) is given by , where denotes frequency. Then the value of |lnx(t)| at t=1 is ___________ (up to 1 decimal place). ( ln denotes the logarithm to ba
The signal energy of the continuous-time signal is