Previous Year Questions
46 questions — organised by subject with solutions and explanations.
🎯 Practice smarter, not harder
Just sign in to unlock everything. Free for all students.
Transformer and emitter follower can both be used for impedance matching at the output of an audio amplifier. The basic relationship between the input power and output power in both the cases is
An ideal op-amp circuit and its input wave form as shown in the figures. The output waveform of this circuit will be
The following circuit has . The input voltage is a sinusoidal at 50 Hz with an rms value of 10 V. Under ideal conditions, the current from the source is
The nature of feedback in the op-amp circuit shown is
The following circuit has a source voltage as shown in the graph. The current through the circuit is also shown. The element connected between a and b could be
The polar plot of an open loop stable system is shown below. The closed loop system is
The first two rows of Routh's tabulation of a third order equation are as follows. This means there are
A system is described by the following state and output equations when u(t) is the input and y(t) is the output The state-transition matrix of the above system is
The asymptotic approximation of the log-magnitude v/s frequency plot of a system containing only real poles and zeros is shown. Its transfer function is
The unit-step response of a unity feed back system with open loop transfer function G(s) = K/((s + 1) (s + 2)) is shown in the figure. The value of K is
The open loop transfer function of a unity feed back system is given by . The gain margin of the is system is
The increasing order of speed of data access for the following device is (I) Cache Memory (II) CD-ROM (III) Dynamic RAM (IV) Processor Registers (V) Magnetic Tape
The complete set of only those Logic Gates designated as Universal Gates is
In an 8085 microprocessor, the contents of the Accumulator, after the following instructions are executed will become XRA A MVI B, F0 H SUB B
For the circuit given above, the Thevenin's resistance across the terminals A and B is
In the figure shown, all elements used are ideal. For time , remained closed and open. At t=0, is opened and is closed. If the voltage across the capacitor at t=0 is zero, the voltage across the capac
For the circuit given above, the Thevenin's voltage across the terminals A and B is
The measurement system shown in the figure uses three sub-systems in cascade whose gains are specified as . The relative small errors associated with each respective subsystem are . The error associat
The two inputs of a CRO are fed with two stationary periodic signals. In the X-Y mode, the screen shows a figure which changes from ellipse to circle and back to ellipse with its major axis changing o
An average-reading digital multi-meter reads 10 V when fed with a triangular wave, symmetric about the time-axis. For the same input an rms-reading meter will read
The figure shows a three-phase delta connected load supplied from a 400V, 50 Hz, 3-phase balanced source. The pressure coil (PC) and current coil (CC) of a wattmeter are connected to the load as shown
The pressure coil of a dynamometer type wattmeter is
A field excitation of 20 A in a certain alternator results in an armature current of 400 A in short circuit and a terminal voltage of 2000 V on open circuit. The magnitude of the internal voltage drop
A 200 V, 50 Hz, single-phase induction motor has the following connection diagram and winding orientations as shown. MM' is the axis of the main stator winding( ) and AA' is that of the auxiliary wind
The figure below shows coils-1 and 2, with dot markings as shown, having 4000 and 6000 turns respectively. Both the coils have a rated current of 25 A. Coil-1 is excited with single phase, 400 V, 50 H
The single phase, 50 Hz iron core transformer in the circuit has both the vertical arms of cross sectional area 20 and both the horizontal arms of cross sectional area 10 . If the two windings shown w
The star-delta transformer shown above is excited on the star side with balanced, 4-wire, 3-phase, sinusoidal voltage supply of rated magnitude. The transformer is under no load condition. With S2 clo
The circuit diagram shows a two-winding, lossless transformer with no leakage flux, excited from a current source, i(t), whose waveform is also shown. The transformer has a magnetizing inductance of 4
Figure shows the extended view of a 2-pole dc machine with 10 armature conductors. Normal brush positions are shown by A and B, placed at the interpolar axis. If the brushes are now shifted, in the di
An SCR is considered to be a semi-controlled device because
In the chopper circuit shown, the main thyristor ( ) is operated at a duty ratio of 0.8 which is much larger the commutation interval. If the maximum allowable reapplied on is 50 V/ s, what should be
The Current Source Inverter shown in figure is operated by alternately turning on thyristor pairs ( ) and ( ). If the load is purely resistive, the theoretical maximum output frequency obtainable will
The circuit shows an ideal diode connected to a pure inductor and is connected to a purely sinusoidal 50 Hz voltage source. Under ideal conditions the current waveform through the inductor will look l
A 3-phase squirrel cage induction motor supplied from a balanced 3-phase source drives a mechanical load. The torque-speed characteristics of the motor(solid curve) and of the load(dotted curve) are s
Match the switch arrangements on the top row to the steady-state V-I characteristics on the lower row. The steady state operating points are shown by large black dots.
A 500 MW, 21 kV, 50 Hz, 3-phase, 2-pole synchronous generator having a rated p.f = 0.9, has a moment of inertia of .The inertia constant (H) will be
For the Y-bus matrix of a 4-bus system given in per unit, the buses having shunt elements are
Match the items in List-I (Type of transmission line) with the items in List-II (Type of distance relay preferred) and select the correct answer using the codes given below the lists.
Three generators are feeding a load of 100 MW. The details of the generators are In the event of increased load power demand, which of the following will happen ?
For a fixed value of complex power flow in a transmission line having a sending end voltage V, the real loss will be proportional to
Out of the following plant categories (i) Nuclear (ii) Run-of-river (iii) Pump Storage (iv) Diesel The base load power plant are
Match the items in List-I (To) with the items in the List-II (Use) and select the correct answer using the codes given below the lists.
A Linear Time Invariant system with an impulse response h(t) produces output y(t) when input x(t) is applied. When the input x(t- ) is applied to a system with impulse response h(t- ), the output will
The Fourier Series coefficients of a periodic signal x(t), expressed as are given by , , , , and for Which of the following is true ?
The z-transform of a signal x[n] is given by . It is applied to a system, with a transfer function . Let the output be y(n). Which of the following is true ?
A cascade of three Linear Time Invariant systems is causal and unstable. From this, we conclude that