Previous Year Questions
1 paper · 47 questions — organised by subject with solutions and explanations.
🎯 Practice smarter, not harder
Just sign in to unlock everything. Free for all students.
For the circuit with an ideal OPAMP shown in the figure. is fixed. If volt for volt and volt for volt, where is measured across connected at the output of this OPAMP, the value of is
An asymmetrical periodic pulse train of amplitude with on-time and off-time is applied to the circuit shown in the figure. The diode is ideal. The difference between the maximum voltage and minimum vo
A circuit with an ideal is shown in the figure. A pulse of duration is applied to the input. The capacitors are initially uncharged. The output voltage of this circuit at (in integer) is _______ V.
Consider the circuit with an ideal OPAMP shown in the figure. Assuming and , the condition at which equals to zero is
A speech signal, band limited to , is sampled at 1.25 times the Nyquist rate. The speech samples, assumed to be statistically independent and uniformly distributed in the range to , are subsequently q
A sinusoidal message signal having amplitude is fed to a delta modulator (DM) operating at a sampling rate of . The minimum step size required to avoid slope overload noise in the DM (rounded off to t
A sinusoidal message signal having root mean square value of and frequency of is fed to a phase modulator with phase deviation constant 2 rad/ volt. If the carrier signal is , the maximum instantaneou
Consider a carrier signal which is amplitude modulated by a single-tone sinusoidal message signal with a modulation index of . If the carrier and one of the sidebands are suppressed in the modulated s
Consider a superheterodyne receiver tuned to . If the local oscillator feeds a signal to the mixer, the image frequency (in integer) is ____________________ .
A message signal having peak-to-peak value of , root mean square value of and bandwidth of is sampled and fed to a pulse code modulation system that uses a uniform quantizer. The output is transmitted
The autocorrelation function of a wide-sense stationary random process is shown in the figure. The average power of is ________________
Consider a polar non-return to zero waveform, using and for representing binary '1' and '0' respectively, is transmitted in the presence of additive zero-mean white Gaussian noise with variance . If t
Two continuous random variables X and Y are related as Let and denote the variances of X and Y, respectively. The variances are related as
A digital transmission system uses a (7,4) systematic linear Hamming code for transmitting data over a noisy channel. If three of the message-codeword pairs in this code , where is the codeword corres
A unity feedback system that uses proportional-integral ( ) control is shown in the figure. The stability of the overall system is controlled by tuning the control parameters and . The maximum value o
The block diagram of a feedback control system is shown in the figure The transfer function of the system is
The electrical system shown in the figure converts input source current to output voltage Current i in the inductor and voltage across the capacitor are taken as the state variables, both assumed to b
The complete Nyquist plot of the open-loop transfer function G(s)H(s) of a feedback control system in the figure. If G(s)H(s) has one zero in the right-half of the s-plane, the number of poles that th
The propagation delays of the XOR gate, AND gate and multiplexer (MUX) in the circuit shown in the figure are 4 ns, 2 ns and 1 ns, respectively. If all the inputs P, Q, R, S and T are applied simultan
If , where x and y indicate the bases of the corresponding numbers, then
Addressing of a memory is realized using a single decoder. The minimum number of gates required for the decoder is
An 8-bit unipolar (all analog output values are positive) digital-to-analog converter (DAC) has a full-scale voltage range from to . If the digital input code is (the leftmost bit is ), then the analo
The propagation delay of the exclusive gate in the circuit in the figure is . The propagation delay of all the flip-flops is assumed to be zero. The clock frequency provided to the circuit is . Starti
The refractive indices of the core and cladding of an optical fiber are 1.50 and 1.48, respectively. The critical propagation angle, which is defined as the maximum angle that the light beam makes wit
Consider a rectangular coordinate system (x,y,z) with unit vectors and . A plane wave traveling in the region with electric field vector is incident normally on the plane at , where is the phase const
Consider the vector field in a rectangular coordinate system (x,y,z) with unit vectors and . If the field F is irrotational (conservative), then the constant (in integer) is _________________
A standard air-filled rectangular waveguide with dimensions , operates at . For the dominant mode of wave propagation, the phase velocity of the signal in . The value (rounded off to two decimal place
The impedance matching network shown n the figure is to match a lossless line having characteristic impedance with a load impedance . A quarter-wave line having a characteristic impedance is connected
For a vector field in a cylindrical coordinate system with unit vectors and , the net flux of D leaving the closed surface of the cylinder (rounded off to two decimal places) is ________________
The energy band diagram of a p-type semiconductor bar of length L under equilibrium condition (i.e.. the Fermi energy level is constant) is shown in the figure. The valance band is sloped since doping
In the circuit shown in the figure, the transistors and are operating in saturation. The channel length modulation coefficients of both the transistors are non-zero. The transconductance of the and ar
A silicon P-N junction is shown in the figure. The doping in the P region is and doping in the N region is . The parameters given are Built-in voltage Electron charge Vacuum permittivity Relative perm
A bar of silicon is doped with boron concentration of and assumed to be fully ionized. It is exposed to light such that electron-hole pairs are generated throughout the volume of the bar at the rate o
For the transistor in the circuit shown in the figure, and , where is the mobility of electron, is the oxide capacitance per unit area , W is the width and L is the length. The channel length modulati
For an n-channel silicon with gate oxide thickness, the substrate sensitivity is found to be at a substrate voltage , where is the threshold voltage of the . Assume that, , where is the separation bet
Consider the circuit shown in the figure. The value of (rounded off to one decimal place) is _________ V.
In the circuit shown in the figure, the switch is closed at time , while the capacitor is initially charged to . The time after which the voltage across the capacitor becomes zero (rounded off to thre
Consider the two-port network shown in the figure. The admittance parameters, in siemens, are
Consider the circuit shown in the figure. The current I flowing through the resistor between P and Q (rounded off to one decimal place) is ________ A.
The circuit in the figure contains a current source driving a load having an inductor and a resistor in series, with a shunt capacitor across the load. The ammeter is assumed to have zero resistance.
The switch in the circuit in the figure is in position P for a long time and then moved to position Q at time t=0. The value of at is
The exponential Fourier series representation of a continuous-time periodic signal x(t) is defined as where is the fundamental angular frequency of x(t) and the coefficients of the series are . The fo
For a unit step input u[n], a discrete-time system produces an output signal . Let be the output of the system for an input . The value of is ______
Consider two 16-point sequences x[n] and h[n]. Let the linear convolution of x[n] and h[n] be denoted by y[n], while z[n] denotes the 16-point inverse discrete Fourier transform (IDFT) of the product
Consider a real-valued base-band signal x(t), band limited to . The Nyquist rate for the signal is
Consider the signals and , where is the unit step sequence. Let and be the discrete-time Fourier transform of and , respectively. The value of the integral (rounded off to one decimal place) is ______