Previous Year Questions
1 paper · 46 questions — organised by subject with solutions and explanations.
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In the circuit shown, a Zener diode is used to regulate the voltage across load . The input is an unregulated DC voltage with a minimum value of and a maximum value of . The value of is . The Zener di
In the circuit shown, beta of the transistor is 100. Assume . The voltage across will be when is __________ . (Round off to 2 decimal places.)
A Schmitt-trigger inverter has a low output level of and a high output level of . It has input thresholds of and . The input capacitance and output resistance of the Schmitt-trigger are negligible. Th
Consider a closed-loop system as shown. is the plant transfer function and is the compensator. For a unit-step input, the output response has damped oscillations. The damped natural frequency is _____
The state space representation of a first-order system is given as where,x is the state variable, u is the control input and y is the controlled output. Let be the control law, where K is the controll
For the closed-loop system shown, the transfer function is
The Bode magnitude plot for the transfer function of the circuit is as shown. The value of R is _____________ . (Round off to 2 decimal places.)
In the given figure, plant and compensator . The external disturbance input is D(s). It is desired that when the disturbance is a unit step, the steady-state error should not exceed 0.1 unit. The mini
A 16-bit synchronous binary up-counter is clocked with a frequency .The two most significant bits are together to form an output Y. Measurements show that Y is periodic, and the duration for which Y r
A counter is constructed with three D flip-flops. The input-output pairs are named and , where the subscript 0 denotes the least significant bit. The output sequence is desired to be the Gray-code seq
In the given circuit, for maximum power to be delivered to , its value should be ______________ . (Round off to 2 decimal places.)
For the network shown, the equivalent Thevenin voltage and Thevenin impedance as seen across terminals 'ab' is
In the given circuit, for voltage to be zero, the value of should be _________. (Round off to 2 decimal places).
In the circuit, switch 'S' is in the closed position for a very long time. If the switch is opened at time , then in amperes, for is
An air-core radio-frequency transformer as shown has a primary winding and a secondary winding. The mutual inductance M between the windings of the transformer is ____________ .(Round off to 2 decimal
The input impedance, for the network shown is
A three-phase balanced voltage is applied to the load shown. The phase sequence is . The ratio is ____________.
A square wave, switching between and , is applied to a high-pass filter circuit as shown. The output voltage waveform across the resistor is peak-to-peak. If the resistance R is , then the value C is
A signal generator having a source resistance of is set to generate a sinewave. Open circuit terminal voltage is peak-to-peak. Connecting a capacitor across the terminals reduces the voltage to peak-t
The power input to a induction motor running at is . The total stator losses are . If the total friction and windage losses are , then the efficiency is _____________%.
In a single-phase transformer, the total iron loss is at nominal voltage of and frequency . The total iron loss is at and . Then, at nominal voltage and frequency, the hysteresis loss and eddy current
A belt-driven shunt generator running at delivers to a grid. It continues to run as a motor when the belt breaks, taking from the grid. The armature resistance is , field resistance is , and brush dro
An alternator with internal voltage of and synchronous reactance of is connected by a transmission line of reactance to a synchronous motor having synchronous reactance and internal voltage of . If th
Consider the table given: The correct combination that relates the constructional feature, machine type and mitigation is
An 8-pole, , three-phase, slip-ring induction motor has an effective rotor resistance of per phase. Its speed at maximum torque is . The additional resistance per phase that must be inserted in the ro
Consider a large parallel plate capacitor. The gap 'd' between the two plates is filled entirely with a dielectric slab of relative permittivity 5. The plates are initially charged to a potential diff
One coulomb of point charge moving with a uniform velocity enters the region having a magnetic flux density . The magnitude of force on the charge at is _____________ N. ( , , and are unit vectors alo
Which one of the following vector functions represents a magnetic field ? ( , and are unit vectors along x-axis, y-axis, and z-axis, respectively)
A point charge is held at the origin of a cartesian coordinate system. If a second point charge of is moved from to and subsequently to , then the total work done is ___________ . (Round off to 2 deci
In the circuit shown, the input is a sinusoidal voltage having an value of . The worst-case peak-inverse voltage seen across any diode is ____________V. (Round off to 2 decimal places.)
A single-phase full-bridge inverter fed by a produces a symmetric quasi-square waveform across 'ab' as shown. To achieve a modulation index of 0.8, the angle expressed in degrees should be ___________
Consider the buck-boost converter shown. Switch Q is operating at and 0.75 duty-cycle. Assume diode and switch to be ideal. Under steady-state condition, the average current flowing through the indica
The waveform shown in solid line is obtained by clipping a full-wave rectified sinusoid (shown dashed). The ratio of the value of the full-wave rectified waveform to the value of the clipped waveform
Consider the boost converter shown. Switch Q is operating at with a duty cycle of 0.6. Assume the diode and switch to be ideal. Under steady-state condition, the average resistance as seen by the sour
Suppose and are a set of unbalanced current phasors in a three-phase system. The phase-B zero-sequence current p.u. If phase-A current p.u and phase-C current p.u, then in p.u is
A 3-Bus network is shown. Consider generators as ideal voltage sources. If rows and of the matrix correspond to Bus and , respectively, then of the network is
In the figure shown, self-impedances of the two transmission lines are each, and is the mutual impedance. Bus voltages shown in the figure are in p.u. Given that , the maximum steady-state real power
Two generators have cost functions and . Their incremental-cost characteristics are They need to deliver a combined load of . Ignoring the network losses, for economic operation, the generations and (
Two single-core power cables have total conductor resistances of and , respectively, and their insulation resistances (between core and sheath) are and , respectively. When the two cables are joined i
Consider a power system consisting of N number of buses. Buses in this power system are categorized into slack bus, PV buses and PQ buses for load flow study. The number of PQ buses is . The balanced
The casual signal with z-transformer is ( is the unit step signal)
Consider a continuous-time signal defined by for , and . Let the Fourier transform of be defined as . The maximum magnitude of is ___________.
If the input x(t) and output y(t) of a system are related as , then the system is
Two discrete-time linear time-invariant systems with impulse responses and are connected in cascade, where is the Kronecker delta. The impulse response of the cascaded system is
Let be an even function, i.e. for all t. Let the Fourier transform of be defined as . Suppose for all , and . Then