Previous Year Questions
48 questions — organised by subject with solutions and explanations.
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An npn BJT has , , and DC current gain . For this transistor and are
The inverting OP-AMP shown in figure has an open-loop gain of 100. The closed loop gain is
The current gain of a BJT is
Consider the following two statements: Statement 1: A stable multi-vibrator can be used for generating square wave. Statement 2: B stable multi-vibrator can be used for storing binary information.
In figure, assume the OP-AMPs to be ideal. The output of the circuit is:
The ideal OP-AMP has the following characteristics.
The oscillator circuit shown in figure is
The transistor shunt regulator shown in figure has a regulated output voltage of 10 V, when the input varies from 20 V to 30 V. The relevant parameters for the Zener diode and the transistor are: =9.5
The PDF of a Gaussian random variable X is given by . The probability of the event {X=4} is
During transmission over a communication channel, bit errors occur independently with probability p. If a block of n bits is transmitted, the probability of at most one bit error is equal to
The PSD and the power of a signal g(t) are, respectively, . The PSD and the power of the signal g(t) are, respectively
The Nyquist sampling interval, for the signal is
A video transmission system transmits 625 picture frames per second. Each frame consists of a 400 x 400 pixel grid with 64 intensity levels per pixel. The data rate of the system is
A band limited signal is sampled at the Nyquist rate. The signal can be recovered by passing the samples through
The feedback control system in figure is stable
If the characteristic equation of a closed-loop system is , then the system is
The open-loop DC gain of a unity negative feedback system with closed-loop transfer function is
The equivalent of the block diagram in figure is given in
The root-locus diagram for a closed loop feedback system is shown in figure. The system is overdamped.
An electrical system and its signal-flow graph representations are shown in figure (a) and (b) respectively. The values of and H, respectively are
The Nyquist plot for the open-loop transfer function G(s) of a unity negative feedback system is shown in figure. If G(s) has no pole in the right half of splane, the number of roots of the system cha
In figure, the LED
The 2's complement representation of -17 is
For the ring oscillator shown in figure, the propagation delay of each inverter is 100 pico second. What is the fundamental frequency of the oscillator output?
In the DRAM cell in figure, the of the NMOSFET is 1 V. For the following three combinations of WL and BL voltages.
In the TTL circuit in figure, to are select lines and and are input lines. and are LSBs. The output Y is
The digital block in figure is realized using two positive edge triggered D-flip-flops. Assume that for , = =0. The circuit in the digital block is given by:
A uniform plane electromagnetic wave incident normally on a plane surface of a dielectric material is reflected with a VSWR of 3. What is the percentage of incident power that is reflected?
The dominant mode in a rectangular waveguide is , because this mode has
A material has conductivity of mho/m and a relative permittivity of 4. The frequency at which the conduction current in the medium is equal to the displacement current is
If a plane electromagnetic wave satisfies the equation the wave propagates in the
The phase velocity of waves propagating in a hollow metal waveguide is
A transmission line is distortion-less if
The Z parameters and for the 2-port network in figure are
In figure shown below, the value of the load resistor R which maximizes the power delivered to it is
The voltage in figure is
If each branch of a Delta circuit has impedance , then each branch of the equivalent Wye circuit has impedance.
The admittance parameter in the 2-port network in figure is
The voltage in figure is
When the angular frequency in figure is varied from 0 to , the locus of the current phasor is given by
The transfer function of a system is given by . The impulse response of the system is: (* denotes convolution, and U(t) is unit step function)
Let denote the delta function. The value of the integral is
The region of convergence of the z-transform of a unit step function is
The impulse response functions of four linear systems S1, S2, S3, S4 are given respectively by where U(t) is the step function. Which of these systems is time invariant, causal and stable?
If a signal f(t) has energy E, the energy of the signal f(2t) is equal to