Previous Year Questions
1 paper · 43 questions — organised by subject with solutions and explanations.
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A system with transfer function is excited by . The steady-state output of the system is zero at
The feedback system shown below oscillates at 2 rad/s when
The state variable description of an LTI system is given by where y is the output and u is the input. The system is controllable for
The transfer function of a compensator is given as is a lead compensator if
The transfer function of a compensator is given as The phase of the above lead compensator is maximum at
Consider the given circuit In this circuit, the race around
The output Y of a 2-bit comparator is logic 1 whenever the 2-bit input A is greater than the 2-bit input B. The number of combinations for which the output is logic 1, is
The state transition diagram for the logic circuit shown is
In the sum of products function f(X,Y,Z)= (2,3,4,5), the prime implicants are
Assuming both the voltage sources are in phase, the value of R for which maximum power is transferred from circuit A to circuit B is
A two-phase load draws the following phase currents : , . These currents are balanced if is equal to.
In the following figure, are ideal capacitors. has been charged to 12 V before the ideal switch S is closed at t=0. The current i(t) for all t is
The average power delivered to an impedance by a current 5cos(100 t+100)A is
In the circuit shown, the three voltmeter readings are 220 V , 122 V , 136 V. If , the approximate power consumption in the load is
The impedance looking into nodes 1 and 2 in the given circuit is
With 10 V dc connected at port A in the linear nonreciprocal two-port network shown below, the following were observed: (i) 1 connected at port B draws a current of 3 A (ii) 2.5 connected at port B dr
For the circuit shown in the figure, the voltage and current expressions are and The average power measured by the wattmeter is
An analog voltmeter uses external multiplier settings. With a multiplier setting of 20 k , it reads 440 V and with a multiplier setting of 80 k , it reads 352 V. For a multiplier setting of 40 k , the
The bridge method commonly used for finding mutual inductance is
A periodic voltage waveform observed on an oscilloscope across a load is shown. A permanent magnet moving coil (PMMC) meter connected across the same load reads
A single phase 10 kVA, 50 Hz transformer with 1 kV primary winding draws 0.5 A and 55W, at rated voltage and frequency, on no load. A second transformer has a core with all its linear dimensions times
A 220 V, 15 kW, 100 rpm shunt motor with armature resistance of 0.25 , has a rated line current of 68 A and a rated field current of 2.2 A. The change in field flux required to obtain a speed of 1600
The locked rotor current in a 3-phase, star connected 15 kW, 4 pole, 230 V, 50 Hz induction motor at rated conditions is 50 A. Neglecting losses and magnetizing current, the approximate locked rotor l
The slip of an induction motor normally does not depend on
In the circuit shown, an ideal switch S is operated at 100 kHz with a duty ratio of 50%. Given that is 1.6 A peak-to-peak and is 5 A dc, the peak current in S is
In the 3-phase inverter circuit shown, the load is balanced and the gating scheme is 180 -conduction mode. All the switching devices are ideal. If the dc bus voltage =300 V, the power consumed by 3-ph
A half-controlled single-phase bridge rectifier is supplying an R-L load. It is operated at a firing angle and the load current is continuous. The fraction of cycle that the freewheeling diode conduct
The typical ratio of latching current to holding current in a 20 A thyristor is
A cylinder rotor generator delivers 0.5 pu power in the steady-state to an infinite bus through a transmission line of reactance 0.5 pu. The generator no-load voltage is 1.5 pu and the infinite bus vo
The figure shows a two-generator system applying a load of = 40MW, connected at bus 2. The fuel cost of generators G1 and G2 are : =10,000 Rs/MWh and =12,500 Rs/MWh and the loss in the line is , where
For the system below, are complex power demands at bus 1 and bus 2 respectively. If pu, the VAR rating of the capacitor ( ) connected at bus 2 is
The bus admittance matrix of a three-bus three-line system is If each transmission line between the two buses is represented by an equivalent -network, the magnitude of the shunt susceptance of the li
The sequence components of the fault current are as follows : pu, pu, pu. The type of fault in the system is
Consider the differential equation with and The numerical value of , is
The unilateral Laplace transform of is . The unilateral Laplace transform of is
The Fourier transform of a signal h(t) is . The value of h(0) is
The input x(t) and output y(t) of a system are related as . The system is
Let y[n] denote the convolution of h[n] and g[n], where h[n]= u[n] and g[n] is a causal sequence. If y[0]=1 and y[1]=1/2, then g[1] equals
If , then the region of convergence (ROC) of its Z-transform in the Z-plane will be