Previous Year Questions
1 paper · 45 questions — organised by subject with solutions and explanations.
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A clipper circuit is shown below. Assuming forward voltage drops of the diodes to be 0.7 V, the input-output transfer characteristics of the circuit is
The transistor used in the circuit shown below has a of 30 and is negligible If the forward voltage drop of diode is 0.7 V, then the current through collector will be
A low-pass filter with a cut-off frequency of 30 Hz is cascaded with a high pass filter with a cut-off frequency of 20 Hz. The resultant system of filters will function as
For the circuit shown below, The CORRECT transfer characteristic is
The open loop transfer function G(s) of a unity feedback control system is given as From the root locus, at can be inferred that when k tends to positive infinity,
The frequency response of a linear system G( ) is provided in the tubular form below Gain Margin and phase margin are
The response h(t) of a linear time invariant system to an impulse , under initially relaxed condition is . The response of this system for a unit step input u(t) is
The steady state error of a unity feedback linear system for a unit step input is 0.1. The steady state error of the same system, for a pulse input r(t) having a magnitude of 10 and a duration of one
A two loop position control system is shown below The gain K of the Tacho-generator influences mainly the
An open loop system represented by the transfer function is
A portion of the main program to call a subroutine SUB in an 8085 environment is given below. : : LXI D, DISP LP : CALL SUB : : It is desired that control be returned to LP+DISP+3 when the RET instruc
A two bit counter circuit is shown below If the state of the counter at the clock time is '10' then the state of the counter at (after three clock cycles) will be
The output Y of the logic circuit given below is
The r.m.s value of the current i(t) in the circuit shown below is
An RLC circuit with relevant data is given below. The current in the figure above is
The voltage applied to a circuit is volts and the circuit draws a current of amperes. Taking the voltage as the reference phasor, the phasor representation of the current in amperes is
In the circuit given below, the value of R required for the transfer of maximum power to the load having a resistance of 3 is
An RLC circuit with relevant data is given below. The power dissipated in the resistor R is
A dual trace oscilloscope is set to operate in the ALTernate mode. The control input of the multiplexer used in the y-circuit is fed with a signal having a frequency equal to
The bridge circuit shown in the figure below is used for the measurement of an unknown element . The bridge circuit is best suited when is a
Consider the following statement (1) The compensating coil of a low power factor wattmeter compensates the effect of the impedance of the current coil. (2) The compensating coil of a low power factor
A lossy capacitor , rated for operation at 5 kV, 50 Hz is represented by an equivalent circuit with an ideal capacitor in parallel with a resistor . The value is found to be 0.102 F and value of Rp =
A digit DMM has the error specification as: 0.2% of reading + 10 counts. If a dc voltage of 100 V is read on its 200 V full scale, the maximum error that can be expected in the reading is
The direct axis and quadrature axis reactance's of a salient pole alternator are 1.2 p.u and 1.0 p.u respectively. The armature resistance is negligible. If this alternator is delivering rated kVA at
A three phase, salient pole synchronous motor is connected to an infinite bus. It is operated at no load a normal excitation. The field excitation of the motor is first reduced to zero and then increa
A 220 V, DC shunt motor is operating at a speed of 1440 rpm. The armature resistance is 1.0 and armature current is 10 A. of the excitation of the machine is reduced by 10%, the extra resistance to be
A 4-point starter is used to start and control the speed of a
A single phase air core transformer, fed from a rated sinusoidal supply, is operating at no load. The steady state magnetizing current drawn by the transformer from the supply will have the waveform
A three-phase 440 V, 6 pole, 50 Hz, squirrel cage induction motor is running at a slip of 5%. The speed of stator magnetic field to rotor magnetic field and speed of rotor with respect of stator magne
A voltage commutated chopper circuit, operated at 500 Hz, is shown below. If the maximum value of load current is 10 A, then the maximum current through the main (M) and auxiliary (A) thyristors will
A solar energy installation utilize a three-phase bridge converter to feed energy into power system through a transformer of 400V/400 V, as shown below. The energy is collected in a bank of 400 V batt
A three phase current source inverter used for the speed control of an induction motor is to be realized using MOSFET switches as shown below. Switches are identical switches. The proper configuration
Circuit turn-off time of an SCR is defined as the time
The input voltage given to a converter is V The current drawn by the converter is + + A The active power drawn by the converter is
A three-bus network is shown in the figure below indicating the p.u. impedance of each element. The bus admittance matrix, Y-bus, of the network is
A load center of 120 MW derives power from two power stations connected by 220 kV transmission lines of 25 km and 75 km as shown in the figure below. The three generators G1, G2 and G3 are of 100 MW c
A negative sequence relay is commonly used to protect
A nuclear power station of 500 MW capacity is located at 300 km away from a load center. Select the most suitable power evacuation transmission configuration among the following options
Two generator units G1 and G2 are connected by 15 kV line with a bus at the mid-point as shown below G1 = 250 MVA, 15kV, positive sequence reactance X = 25% on its own base G2 = 100 MVA, 15kV, positiv
For enhancing the power transmission in along EHV transmission line, the most preferred method is to connect a
Given two continuous time signals and which exist for , the convolution z(t)=x(t)*y(t) is
Let the Laplace transform of a function F(t) which exists for and the Laplace transform of its delayed version . Let be the complex conjugate of with the Laplace variable set . If , then the inverse L
A zero mean random signal is uniformly distributed between limits -a and +a and its mean square value is equal to its variance. Then the r.m.s value of the signal is
The fourier series expansion of the periodic signal shown below will contain the following nonzero terms