Previous Year Questions
1 paper · 45 questions — organised by subject with solutions and explanations.
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All the elements in the circuit shown in the following figure are ideal. Which of the following statements is/are true?
The Zener diode in circuit has a breakdown voltage of . The current gain of the transistor in the active region in . Ignore baseemitter voltage drop . The current through the resistance in milliampere
Consider the OP AMP based circuit shown in the figure. Ignore the conduction drops of diodes and . All the components are ideal and the breakdown voltage of the Zener is . Which of the following state
In the Nyquist plot of the open-loop transfer function corresponding to the feedback loop shown in the figure, the infinite semi-circular arc of the Nyquist contour in s-plane is mapped into a point a
A continuous-time system that is initially at rest is described by where is the input voltage and is the output voltage. The impulse response of the system is
For the block diagrm shown in the figure, the transfer function is
The magnitude and phase plots of an LTI system are shown in the figure. The transfer function of the system is
Consider a lead compensator of the form The frequency at which this compensator produces maximum phase lead is . At this frequency, the gain amplification provided by the controller, assuming asymptot
Consider the state-space description of an LTI system with matrices For the input, , the value of for which the steady-state output of the system will be zero, is ___ (Round off to the nearest integer
Consider a unity-gain negative feedback system consisting of the plant (given below) and a proportional-integral controller. Let the proportional gain and integral gain be 3 and 1, respectively. For a
An 8-bit ADC converts analog voltage in the range of 0 to to the corresponding digital code as per the conversion characteristics shown in figure. For , which of the following digital output, given in
Neglecting the delays due to the logic gates in the circuit shown in figure, the decimal equivalent of the binary sequence [ABCD] of initial logic states, which will not change with clock, is
In a given 8-bit general purpose micro-controller there are following flags. C-Carry, A-Auxiliary Carry, O-Overflow flag, PParity ( 0 for even, 1 for odd) R0 and R 1 are the two general purpose regist
The admittance parameters of the passive resistive two-port network shown in the figure are The power delivered to the load resistor in Watt is ____ (Round off to 2 decimal places).
For the circuit shown, if , the instantaneous value of the Thevenin's equivalent voltage (in Volts) across the terminals a-b at time is ___ (Round off to 2 decimal places).
The circuit shown in the figure is initially in the steady state with the switch in open condition and in closed condition. The switch is closed and is opened simultaneously at the instant , where . T
The value of parameters of the circuit shown in the figure are For time , the circuit is at steady state with the switch ' ' in closed condition. If the switch is opened at , the value of the voltage
A 10-pole, , single phase induction motor runs at 540 RPM while driving rated load. The frequency of induced rotor currents due to backward field is
A three-phase synchronous motor with synchronous impedance of per unit per phase has a static stability limit of 2.5 per unit. The corresponding excitation voltage in per unit is ____ (Round off to 2
A three phase squirrel cage induction motor drives a constant torque load at rated speed operating from rated supply and delivering rated output. If the supply voltage and frequency are reduced by the
A separately excited DC motor rated drives a constant torque load at rated speed operating from DC supply drawing rated current. The armature resistance is . If the supply voltage drops by with field
The following columns present various modes of induction machine operation and the ranges of slip The correct matching between the elements in column A with those of column B is
When the winding of the singlephase, 50 , two winding transformer is supplied from an AC current source of frequency , the rated voltage of (rms), . is obtained at the open-circuited terminals a-b. Th
The four stator conductor and of a rotating machine are carrying DC currents of the same value, the directions of which are shown in figure (i). The rotor coils and are formed by connecting the back e
An infinite surface of linear current density exists on the plane, as shown in the figure. The magnitude of the magnetic field intensity at a point due to the surface current in Ampere/meter is ___ (R
In the figure, the electric field and the magnetic field point to and directions, respectively, and have constant magnitudes. positive charge ' ' is released from rest at the origin. Which of the foll
The chopper circuit shown in figure (i) feeds power to a 5 A DC constant current source. The switching frequency of the chopper is . All the components can be assumed to be ideal. The gate signals of
The single phase rectifier consisting of three thyristors and a diode feed power to a constant current load. and are fired at and is fired at . The reference for is the positive zero crossing of . The
The circuit shown in the figure has reached steady state with thyristor ' ' in OFF condition. Assume that the latching and holding currents of the thyristor are zero. The thyristor is turned ON at sec
A semiconductor switch needs to block voltage of only one polarity during OFF state as shown in figure (i) and carry current in both directions during ON state as shown in figure (ii). Which of the fo
For the three-bus power system shown in the figure, the trip signals to the circuit breakers to are provided by overcurrent relays to , respectively, some of which have directional properties also. Th
The bus admittance matrix of a 3-bus power system is given below. Considering that there is no shunt inductor connected to any of the buses, which of the following can NOT be true?
The expressions of fuel cost of two thermal generating units as a function of the respective power generation and are given as where is a constant. For a given value of a, optimal dispatch requires th
A line of length has the following parameters: Resistance, ; Inductance, ; Capacitance, ; The line is represented by the nominal model. With the magnitudes of the sending end and the receiving end vol
The two-bus power system shown in figure (i) has one alternator supplying a synchronous motor load through a transformer. The positive, negative and zero-sequence diagrams of the system are shown in f
The three-bus power system shown in the figure has one alternator connected to bus 2 which supplies and power. Bus 3 is infinite bus having a voltage of magnitude p.u. and angle of . A variable curren
A balanced delta connected load consisting of the series connection of one resistor and a capacitor in each phase is connected to three-phase, supply terminals through a line having an inductance of p
Which of the following statement(s) is/are true?
The Z-transform of a discrete signal is with ROC = R Which one of the following statements is true?
The period of the discrete-time signal described by the equation below is ___ (Round off to the nearest integer).
A signal is sampled at and then passed through an ideal low pass filter having cut-off frequency of . The maximum frequency present in the filtered signal in is ____ (Round off to the nearest integer)
The Fourier transform of the signal is given by Which one of the following statements is true?
The discrete-time Fourier transform of a signal is . Consider that is a periodic signal of period such that Note that . The magnitude of the Fourier series coefficient is ____ (Round off to 3 decimal
For the signals and shown in the figure, is maximum at . Then in seconds is (Round off to the nearest integer).