Previous Year Questions
1 paper · 46 questions — organised by subject with solutions and explanations.
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The current gain in the circuit with an ideal current amplifier given below is
The steady state output ( ), of the circuit shown below, will
The output impedance of a non-ideal operational amplifier is denoted by . The variation in the magnitude of with increasing frequency, , in the circuit shown below, is best represented by
For an ideal MOSFET biased in saturation, the magnitude of the small signal current gain for a common drain amplifier is
For the circuit shown below with ideal diodes, the output will be
An LTI system is shown in the figure where The steady state output of the system, to the input , is given as . The values of and will be
The damping ratio and undamped natural frequency of a closed loop system as shown in the figure, are denoted as and , respectively. The values of and are
The open loop transfer function of a unity gain negative feedback system is given as The Nyquist contour in the s-plane encloses the entire right half plane and a small neighbourhood around the origin
The open loop transfer function of a unity gain negative feedback system is given by . The range of for which the system is stable, is
The Bode magnitude plot of a first order stable system is constant with frequency. The asymptotic value of the high frequency phase, for the system, is . This system has
The maximum clock frequency in MHz of a 4-stage ripple counter, utilizing flipflops, with each flip-flop having a propagation delay of 20 ns, is ___________. (round off to one decimal place)
A MOD 2 and a MOD 5 up-counter when cascaded together results in a MOD ______ counter. (in integer)
The transfer function of a real system, , is given as: where A, B, C and D are positive constants. This system cannot operate as
In the circuit shown below, a three-phase star-connected unbalanced load is connected to a balanced three-phase supply of with phase sequence . The star connected load has and . The value of in , for
An inductor having a Q-factor of 60 is connected in series with a capacitor having a Q-factor of 240. The overall Q-factor of the circuit is ________. (round off to nearest integer)
The network shown below has a resonant frequency of 150 kHz and a bandwidth of 600 Hz. The Q-factor of the network is __________. (round off to nearest integer)
In the circuit shown below, the switch is closed at . The magnitude of the steady state voltage, in volts, across the resistor is _________. (round off to two decimal places).
A balanced Wheatstone bridge has the following arm resistances: is an unknown resistance; . The value of and its accuracy is
Two balanced three-phase loads, as shown in the figure, are connected to a , three-phase, 50 Hz main supply. Given and . The ammeter reading, in amperes, is _______. (round off to nearest integer)
A 4-pole induction motor with inertia of 0.1 drives a constant load torque of 2 Nm. The speed of the motor is increased linearly from 1000 rpm to 1500 rpm in 4 seconds as shown in the figure below. Ne
A star-connected 3-phase, 400 V, 50 kVA, 50 Hz synchronous motor has a synchronous reactance of 1 ohm per phase with negligible armature resistance. The shaft load on the motor is 10 kW while the powe
A 3-phase, 415 V, 4-pole, 50 Hz induction motor draws 5 times the rated current at rated voltage at starting. It is required to bring down the starting current from the supply to 2 times of the rated
A 280 V, separately excited DC motor with armature resistance of and constant field excitation drives a load. The load torque is proportional to the speed. The motor draws a current of 30 A when runni
The frequencies of the stator and rotor currents flowing in a three-phase 8-pole induction motor are 40 Hz and 1 Hz, respectively. The motor speed, in rpm, is _______. (round off to nearest integer)
The type of single-phase induction motor, expected to have the maximum power factor during steady state running condition, is
As shown in the figure below, two concentric conducting spherical shells, centered at and having radii and are maintained at potentials such that the potential at is and at is . Assume that depends on
A long conducting cylinder having a radius 'b' is placed along the z axis. The current density is for the region where is the distance in the radial direction. The magnetic field intensity ( ) for the
If the magnetic field intensity in a conducting region is given by the expression, . The magnitude of the current density, in , at and , is
A single-phase full-bridge diode rectifier feeds a resistive load of from a single phase AC supply. If the diodes are ideal, then the active power, in watts, drawn by the load is _____________. (round
The steady state current flowing through the inductor of a DC-DC buck boost converter is given in the figure below. If the peak-to-peak ripple in the output voltage of the converter is 1 V, then the v
Consider an ideal full-bridge single-phase DC-AC inverter with a DC bus voltage magnitude of 1000 V. The inverter output voltage shown below, is obtained when diagonal switches of the inverter are swi
A 3-phase grid-connected voltage source converter with DC link voltage of 1000 V is switched using sinusoidal Pulse Width Modulation (PWM) technique. If the grid phase current is 10 A and the 3-phase
A charger supplies 100 W at 20 V for charging the battery of a laptop. The power devices, used in the converter inside the charger, operate at a switching frequency of 200 kHz. Which power device is b
For the ideal AC-DC rectifier circuit shown in the figure below, the load current magnitude is and is ripple free. The thyristors are fired with a delay angle of . The amplitude of the fundamental com
The voltage at the input of an AC-DC rectifier is given by where rad/s. The input current drawn by the rectifier is given by The input power factor, (rounded off to two decimal places), is, _________
The most commonly used relay, for the protection of an alternator against loss of excitation, is
Two generating units rated for 250 MW and 400 MW have governor speed regulations of 6% and 6.4%, respectively, from no load to full load. Both the generating units are operating in parallel to share a
The fuel cost functions in rupees/hour for two 600 MW thermal power plants are given by where and are power generated by plant 1 and plant 2, respectively, in MW and is constant. The incremental cost
A 20 MVA, 11.2 kV, 4-pole, 50 Hz alternator has an inertia constant of 15 MJ/MVA. If the input and output powers of the alternator are 15 MW and 10 MW, respectively, the angular acceleration in mechan
If only 5% of the supplied power to a cable reaches the output terminal, the power loss in the cable, in decibels, is _________. (round off to nearest integer)
The geometric mean radius of a conductor, having four equal strands with each strand of radius , as shown in the figure below, is
The valid positive, negative and zero sequence impedances (in p.u.), respectively, for a 220 kV, fully transposed three-phase transmission line, from the given choices are
The discrete time Fourier series representation of a signal with period is written as . A discrete time periodic signal with period , has the non-zero Fourier series coefficients: and . The signal is
Let an input is passed through an LTI system having an impulse response, The output of the system is
Consider the system as shown below where . The system is
Let a causal LTI system be governed by the following differential equation , where and are the input and output respectively. Its impulse response is