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GATE EC : Electromagnetics Champion Quiz 1

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Question 1

The directivity of an antenna array can be increased by adding more antenna elements, as a larger number of elements

Question 2

For a Hertz dipole antenna, the half power beam width (HPBW) in the E-plane is

Question 3

If the diameter of a

dipole antenna is increased from

, then its

Question 4

Consider a lossless antenna with a directive gain of +6db. If 1mW of power is fed to it the total power radiated by the antenna will be

Question 5

The radiation pattern of an antenna in spherical co-ordinates is given by

The directivity of the antenna is

Question 6

Two identical and parallel dipole antennas are kept apart by a distance of $Description: D:\GradeStack Courses\GATE Tests (Sent by Ravi)\GATE EC-ME-17-Mar\GATE-ECE-2005_files\image170.png$ in the H-plane. They are fed with equal currents but right most antenna has a phase shift of +90 °. The radiation pattern is given as

Question 7

The waveguide Magic Tee can be used as:

Question 8

Two half-wave dipole antennas placed as shown in the figure are excited with sinusoidally varying currents of frequency 3 MHz and phase shift of π/2 between them (the element at the origin leads in phase). If the maximum radiated E-field at the point P in the x-y plane occurs at an azimuthal angle of 60^o the distance d (in meters) between the antennas is ____________.
$Description: Description: D:\GradeStack Courses\GATE Tests (Sent by Ravi)\GATE EC 10-Mar\GATE-ECE-2015-Paper-2_files\image254.jpg$

Question 9

At 20GHz, the gain of a parabolic dish antenna of 1 meter diameter and 70% efficiency is

Question 10

A ramp input applied to a unity feedback system results in 5% steady state error. The type number and zero frequency gain of the system are respectively.

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ESE & GATE EC Electromagnetics

Sep 7ESE & GATE EC