Practice previous years' questions for Electromagnetics, Antennas, Microwave Engineering, Digital Communication, Signals & Systems, Analog Electronics, VLSI, and Optical Communications.
Marking scheme: +3.00 positive, -0.75 negative (ICRB Standard).
Gain of an RC low pass filter having a time constant 'τ' and frequency 'ω' is:
For a directional coupler, the quantities I (isolation in dB), D (directivity in dB), C (coupling in dB) are related by
The two numbers represented in signed 2's complement form are $P = 11101101$ and $Q = 11100110$. If Q is subtracted from P, the value obtained in signed 2's complement is
Depletion type MOSFET operates in:
Electric Field and Magnetic Field are perpendicular to each other in :
A linear regulator is attempted using discrete components as shown below. What is the output voltage?
If range of a radar is to be doubled, the peak transmit power of the radar has to be :
The electric field measured in the far field of an antenna at a distance of 50m is $1\text{V/m}$. The average power densities at a distance of 500m from the antenna is
If a counter having 10 Flip Flops is initially at 0, what count will it hold after 2060 pulses ?
For a frequency modulated signal represented by $s(t) = 10\sin(6 \times 10^8 t + 2\sin 100\pi t)$. The maximum frequency deviation in the carrier from its unmodulated frequency is:
For which of the following conditions, the circuit shown below will function as precision full wave rectifier?
In a monostatic radar, if the antenna aperture is doubled, then the radar range will
The disadvantage of single stub matching is that
A certain antenna with an efficiency of 95% has maximum radiation intensity of $0.5\text{ W/sr}$. The directivity of the antenna fed by input power of 0.4 W
A memory system of size 16 K bytes is required to be designed using memory chips which have 12 address lines and 4 data lines each. Then number of such chips required to design the memory system is
In the asymptotic bode plot of a transfer function of a closed loop system shown below, the number of poles and zeros are,
Plane Wave travelling in free space has an average Poynting vector of $3\text{W/m}^2$. Average energy density ($n\text{J/m}^3$) of the wave is:
For two identical n-channel JFET's connected in parallel as shown in fig. below, the pinch-off voltage of equivalent JFET is:
The velocity at which a sinusoidal signal of $10^9\text{ rad/s}$ travels down a loss-less transmission line for which $L = 0.4\,\mu\text{H/m}$ and $C = 40\text{ pF/m}$ is
The Maxwell's equation $\nabla \times \overline{E} = -\frac{\partial\overline{B}}{\partial t}$ is obtained from:
A lossless line having characteristic impedance Zo is terminated with a load impedance of jZo. VSWR of the line will be :
A signal $1 + \cos(2\pi ft) + \cos(6\pi ft)$ where $f = 1\text{MHz}$ is sampled at 3MHz and Fourier Transform is carried out. How many lines will be seen in Fourier Transform?
The array factor of an array antenna depends on
Which of the following parameter is improved by introducing pipelining in digital design?
A transmission line having characteristic impedance 'Z' of varying length in series with a load impedance 'Z_L' appears in a Smith Chart on: