Electromagnetic waves and radiating systems sample important Multiple Choice Questions(MCQs)
The theory of electromagnetic waves brought revolution to advance communication in nineteenth century. Faraday’s law, Coulomb's law, L...
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The theory of electromagnetic waves brought revolution to
advance communication in nineteenth century. Faraday’s law, Coulomb's law, Lenz’s
law are the three major laws in electromagnetic. Another great scientist is
Maxwell whose contribution to electromagnetic will never be forgotten. Today’s
tutorial is completely based on Electromagnetic waves and radiating system.
Many people find it difficulties during the exam what will be the important
MCQ’s for the electromagnetic waves paper. Here in this tutorial topics will be
covered such as Electromagnetic theory, transmission lines, antenna parameter
and its characteristics, antenna array, aperture array and propagation of EM
waves. This tutorial will definitely help the engineering students specially
help the WBUT students. If you find this tutorial helpful and interesting
please don’t forget to share it with others.
EM waves and radiating system important MCQs
1)
What is the unit of electromagnetic flux
density?
Answer: Columb/m2
2)
What will happen if a transmission line of
length lambda/4 shorted at far end?
Answer:
It will behave like a pure inductor.
3)
How will you obtain an impedance inversion?
Answer:
Using quarter wave lines.
4)
The VSWR of a transmission line which is terminated
by a pure capacitor is—
Answer: VSWR will vary with the value of the
capacitor.
5)
UHF radio waves propagate as
Answer: Space wave.
6)
What is radiation resistance of an antenna?
Answer: Resistance that represent the radiating power.
7)
What is the standard reference antenna for the
directive gain?
Answer: Isotropic antenna
8)
Pointing vector is used—
Answer: to measure the rate of energy flow.
9)
Name an atmospheric layer that persists at
night.
Answer:
F2 layer
10)
For a satellite communication the uplink frequency
should be—
Answer:
Higher
11)
If the number of turns of a coil is increased to
three times, the inductance will—
Answer: increase three times
12)
If a wave is propagated within a perfect
dielectric, there will be –
Answer: no attenuation
13)
Why a dielectric is placed in an electric field?
Answer:
to increase field strength.
14)
When the magnitudes of two waves are same but
the phase difference is 90 degree, it will generate
Answer:
Circularly polarized wave
15)
The electric field lines and equipotential lines
cut each other—
Answer:
orthogonally
16)
What type of law is obeyed by conduction
current?
Answer:
Ohm’s law
17)
Equation that represent the direction of
propagation of EM waves –
Answer:
E * H
18)
The unit of electric field density is –
Answer: Volt/m
19)
What is the value of intrinsic impedance in free
space?
Answer:
377 ohm.
20)
Equation that represents a distortion less line
is
Answer:
RC=LG
21)
What type of propagation system is used by
terrestrial TV transmission?
Answer:
Ground wave propagation.
22)
What is an antenna?
Answer:
an antenna is a transducer.
23)
What is the unit of magnetic field strength?
Answer:
Tesla
24)
What is the function of director element in Yagi
Uda antenna?
Answer: act as a capacitive element.
25)
Full form of HPBW is—
