Previous Year Questions
1 paper · 46 questions — organised by subject with solutions and explanations.
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The components in the circuit shown below are ideal. If the op-amp is in positive feedback and the input voltage is a sine wave of amplitude 1 V, the output voltage is
Using the incremental low frequency small-signal model of the MOS device, the Norton equivalent resistance of the following circuit is
In the circuit shown below, all the components are ideal. If is +2 V, the current sourced by the op-amp is __________ mA.
The components in the circuit given below are ideal. If R = 2 and C = 1 , the -3 dB cut-off frequency of the circuit in Hz is
An enhancement MOSFET of threshold voltage 3 V is being used in the sample and hold circuit given below. Assume that the substrate of the MOS device is connected to -10 V. If the input voltage lies be
In the circuit shown below, all the components are ideal and the input voltage is sinusoidal. The magnitude of the steady-state output (rounded off to two decimal places) is _________ V.
In the voltage regulator shown below, is the unregulated at 15 V. Assume = 0.7 V and the base current is negligible for both the BJTs. If the regulated output is 9 V, the value of is ________ .
For the BJT in the amplifier shown below, . Assume the BJT output resistance ( ) is very high and the base current is negligible. The capacitors are also assumed to be short circuited at signal freque
as defined below, are the phase modulated and the frequency modulated waveforms, respectively, corresponding to the message signal m(t) shown in the figure. and where is the phase deviation constant i
In a digital communication system, a symbol S randomly chosen from the set ( ) is transmitted. It is given that and . The received symbol is Y = S + W. W is a zero-mean unit-variance Gaussian random v
A digital communication system transmits a block of N bits. The probability of error in decoding a bit is . The error event of each bit is independent of the error events of the other bits. The receiv
For the modulated signal , the message signal and the carrier frequency is 1 MHz. The signal is passed through a demodulator, as shown in the figure below. The output of the demodulator is
A binary random variable X takes the value +2 or -2. The probability . The value of (rounded off to one decimal place), for which the entropy of X is maximum, is __________
X is a random variable with uniform probability density function in the interval [-2,10]. For Y = 2X-6, the conditional probability (rounded off to three decimal places) is _____.
The random variable where and W(t) is a real white Gaussian noise process with two-sided power spectral density W/Hz, for all f. The variance of Y is _________.
Consider the following closed loop control system where and . If the steady state error for a unit ramp input is 0.1, then the value of K is _______.
A system with transfer function is subjected an input . The steady state output of the system is . The value of is ____.
The pole-zero map of a rational function G(s) is shown below. When the closed counter is mapped into the G(s)-plane, then the mapping encircles.
The loop transfer function of a negative feedback system is The value of K, for which the system is marginally stable, is ________.
The characteristic equation of a system is In the root locus plot for the given system, as K varies from 0 to , the break-away or break-in point(s) lie within
For the given circuit, which one of the following is the correct state equation?
For the components in the sequential circuit shown below, is the propagation delay, is the setup time, and is the hold time. The maximum clock frequency (rounded off to the nearest integer), at which
P, Q, and R are the decimal integers corresponding to the 4-bit binary number 1100 considered in signed magnitude, 1's complement, and 2's complement representations, respectively. The 6-bit 2's compl
The state diagram of a sequence detector is shown below. State is the initial state of the sequence detector. If the output is 1, then
A 10-bit D/A converter is calibrated over the full range from 0 to 10 V. If the input to the D/A converter is 13A (in hex), the output (rounded off to three decimal places) is _________ V.
The figure below shows a multiplexer where are the select lines, are the input data lines, EN is the enable line, and is the output, F is
The magnetic field of a uniform plane wave in vacuum is given by The value of b is _____
The impedances Z=jX, for all X in the range ( ), map to the Smith chart as
A transmission line of length and having a characteristic impedance of 50 is terminated with a load of 400 . The impedance (rounded off to two decimal places) seen at the input end of the transmission
A single crystal intrinsic semiconductor is at a temperature of 300 K with effective density of states for holes twice that of electrons. The thermal voltage is 26 mV. The intrinsic Fermi level is shi
Consider the recombination process via bulk traps in a forward biased homojunction diode. The maximum recombination rate is . If the electron and the hole capture cross-section are equal, which one of
A pn junction solar cell of area 1.0 , illuminated uniformly with 100 mW , has the following parameters: Efficiency = 15%, open circuit voltage = 0.7 V, fill factor = 0.8, and thickness = 200 , The ch
A one-sided abrupt junction diode has a depletion capacitance CD of 50 pF at a reverse bias of 0.2 V. The plot of versus the applied voltage V for this diode is a straight line as shown in the figure
The band diagram of a p-type semiconductor with a band-gap of 1 eV is shown. Using this semiconductor, a MOS capacitor having of of 100 and a metal work function of 3.87 eV is fabricated. There is no
The base of an npn BJT T1 has a linear doping profile as shown below. The base of another npn BJT T2 has a uniform doping of . All other parameters are identical for both the devices. Assuming that th
For a 2-port network consisting of an ideal lossless transformer, the parameter (rounded off to two decimal places) for a reference impedance of 10 , is _____.
The current in the RL-circuit shown below is . The value of the inductor (rounded off to two decimal places) is _________ H.
In the circuit shown below, the Thevenin voltage is
The current I in the given network is
In the given circuit, the two-port network has the impedance matrix . The value of for which maximum power is transferred to the load is _________ .
A finite duration discrete-time signal x[n] is obtained by sampling the continuous-time signal at sampling instants t = n/400, n = 0,1,..., 7. The 8-point discrete Fourier transform (DFT) of x[n] is d
The transfer function of a stable discrete-time LTI system is , where K and are real numbers. The value of (rounded off to one decimal place) with , for which the magnitude response of the system is c
is the Fourier transform of shown below. The value of (rounded off to two decimal places) is ______.
The output y[n] of a discrete-time system for an input x[n] is . The unit impulse response of the system is
Which one of the following pole-zero corresponds to the transfer function of an LTI system characterized by the input-output difference equation given below?