Previous Year Questions
1 paper · 45 questions — organised by subject with solutions and explanations.
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A difference amplifier is shown in the figure. Assume the op-amp to be ideal. The CMRR (in ) of the difference amplifier is _____(rounded off to 2 decimal places).
A BJT biasing circuit is shown in the figure, where and . The Quiescent Point values of and are respectively
In the given circuit, the diodes are ideal. The current through the diode in milliamperes is ______ (rounded off to two decimal places).
Consider the stable closed-loop system shown in the figure. The magnitude and phase values of the frequency response of are given in the table. The value of the gain for a phase margin is (rounded off
For the block-diagram shown in the figure, the transfer function is
Consider the stable closed-loop system shown in the figure. The asymptotic Bode magnitude plot of has a constant slope of decade at least till with the gain crossover frequency being . Hie asymptotic
Consider the cascaded system as shown in the figure. Neglecting the faster component of the trasient response, which one of the following options is a first-order pole-only approximation such that the
Consider the standard second-order system of the form with the poles and having negative real parts. The pole locations are also shown in the figure. Now consider two such second-order systems as defi
Consider the closed-loop system shown in the figure with . The root locus for the closed-loop system is to be drawn for . The angle of departure (between and ) of the root locus branch drawn from the
Simplified form of the Boolean function: is
In the circuit, the present value of is 1 . Neglecting the delay in the combinatorial circuit, the values of and , respectively, after the application of the clock will be
To obtain the Boolean function , the inputs in the figure should be
For a two-phase network, the phase voltages and are to be expressed in terms of sequence voltages and as . The possible option(s) for matrix is/are
All the elements in the circuit are ideal. The power delivered by the source in watts is
For the circuit shown in the figure, the source frequency is . The mutual inductance between the magnetically coupled inductors is with their self inductances being and . The Thevenin's impedance. , b
The circuit shown in the figure with the switch open, is in steady state. After the switch is closed, the time constant of the circuit in seconds is
Two passive two-port network and are connected as shown in the figure. The impedance matrix of network is . The admittance matrix of network is . Let the matrix of the two-port network in the figure b
The table lists two instrument transformers and their features: The correct matching of the two column is
In the circuit shown, and . It is supplied by a three phase source with the phase sequence being R-Y-B. Assume the watt meters and to be ideal. The magnitude of the difference between the readings of
A three phase, pole induction motor runs at . The stator copper loss, core loss, and the rotational loss of the motor can be neglected. the percentage efficiency of the motor is
A 3-phase star connected slip ring induction motor has the following parameters referred to the stator: The per phase stator to rotor effective turns ratio is . The rotor winding is also star connecte
Which one of the following options represents possible voltage polarities in a single phase two winding transformer? Here, is the applied primary voltage, is the induced primary voltage, is the open c
A 3-phase. MVA synchronous generator is connected to an inductive load of power factor via a lossless line with a per-phase inductive reactance of . The per-phase synchronous reactance of the generato
A . DC shunt motor has armature resistance including brushes. The motor draws a no-load current of . The field current is constant at . Assuming that the core and rotational losses are constant and in
Which of the following option is/are correct for the Automatic Generation Control (AGC) and Automatic Voltage Regulator (AVR) installed with synchronous generators?
The given equation represents a magnetic field strength in the spherical coordinate system, in free space. Here, and represent the unit vectors along and , respectively. The value of in the equation s
In the coordinate system, three point-charges and are located in free space at and respectively. The value of for the electric field to be zero at is _____ (rounded off to 1 decimal places).
A single-phase triac based voltage controller feeds a series load. The input supply is . The values of and are and , respectively. The minimum triggering angle of the triac to obtain controllable outp
A forced commutated thyristorized step-down chopper is shown in the figure. Neglect the ON-state drop across the power devices. Assume that the capacitor is initially charged to with the polarity show
A single-phase half-controlled bridge converter supplies an inductive load with ripple free load current. The triggering angle of the converter is . The ratio of the rms value of the fundamental compo
In the DC-DC converter shown in the figure, the current through the inductor is continuous, The switching frequency is . The voltage across the load is assumed to be constant and ripple free. The peak
If the following switching devices have similar power ratings, which one of them is the fastest?
A single-phase full bridge voltage source inverter (VSI) feeds a purely inductive load. The inverter output voltage is a square wave in conduction mode. The fundamental frequency of the output voltage
A single-phase full-controlled thyristor converter bridge is used for regenerative braking of a separately excited DC motor with the following specifications: Assume that the motor is running at and t
For the three-bus lossless power network shown in the figure, the voltage magnitudes at all the buses are equal to 1 per unit (pu), and the differences of the voltage phase angles are very small. The
The incremental cost curves of two generators (Gen A and Gen B) in a plant supplying a common load are shown in the figure. If the incremental cost of supplying the common load is Rs. 7400 per MWh, th
The figure shows the single line diagram of a 4-bus power network, Branches , and have impedances and per-unit (pu), respectively, where , with and . The current drawn from each load bus (marked as ar
The single line diagram of a lossless system is shown in the figure. The system is operating in steady-state at a stable equilibrium point with the power output of the generator being . where is the l
If the energy of a continuous-time signal is and the energy of the signal is , then is ______ (rounded off to 1 decimal place).
The input and the output of a system are related as The system is
Suppose signal is obtained by the time-reversal of signal , i.e., , . Which one of the following options is always true for the convolution of and ?
If is the unit step function, then the region of convergence (ROC) of the Laplace transform of the signal is
Let be the Fourier transform of the signal, . The value of the derivative of at at is _____ (rounded off to 1 decimal place)
If the Z-transform of a finite-duration discrete-time signal is , then the -transform of the signal is
Consider the discrete-time system and defined as follows: Which one of the following statement is true?