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ElectroMagnetic Field Theory
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In figure the voltage distribution on a vertical earthed antenna is represented by
Curve D
Curve C
Curve A
Curve B
An end fire array consisting of several half-wave lengths of directive gain 40, then array length will be
5 λ
20 λ
10 λ
100 λ
A square corner reflector is used in
TV broadcast
All of the above
Radio astronomy
point to point communication
A conductor is said to be perfect if it has __________ conductivity
Unity
finite
Infinite
Zero
In a medium if ε, μ and σ are constant throughout the medium, then it is known as
perfect vacuum
distributed medium
dielectric medium
homogeneous medium
The directivity of 20 turn helix having a = 12° circumference equal to one wavelength, will be
18 dB
12 dB
1.8 dB
6 dB
A long periodic antenna is a
directional antenna
None of the above
frequency independent antenna
frequency dependent antenna
300 to 3000 MHz frequency is categorized as
SHF
UHF
mf
HF
A transmission line has characteristics impedance of
(75 + j 0.01) Ω and is terminated in a load impedance of
(70 + j 50) Ω. The transmission coefficient will be
1.70 - j 2.97
0.08 + j 0.32
1.08 + j 0.32
1.32 + j 1.38
At a particular time it is observed that the frequencies of F layer at Delhi is 3 MHz the maximum electron density is
11 x 1012
1.1 x 1010
11 x 1010
0.11 x 1010
Consider isotropic radiator radiating a power of 1watt.
At a distance of 1 metre, the power per unit area with equal
1 watt/m2
2p watt/m2
4p watt/m2
1/4p watt/m2
When the height of a vertical earthed antenna is less than λ/4
the base input impedance will be negligibly small
the base input impedance will be capacitive
the base input impedance will be purely resistive
the base input impedance will be inductive
Which of the following does not characterize a ferromagnetic material
Permittivity
reluctance
coercivity
Permeability
The numerical value of directive gain may lie between
0 and ∞
0 and 1
1 and ∞
1 and + 1
If reflection coefficient is 1/5, then corresponding VSWR is given by
1
2
3/2
3
Which of the following antennas is λ /4 length
Marconi
monopole
Parabolic
dipole
Which one of the following potential does not satisfy Laplace's equations
v = 10 xy
v = p cos φ
v = f cos φ + 10
Brewster angle is the angle for which there is
reflection and the incident wave is horizontally polarized
no reflection and the incident wave is horizontally polarized
no reflection and the incident wave is vertically polarized
None of the above
The minimum height of outer atmosphere is
100 km
200 km
400 km
150 km
Calculate the critical frequency for the E layer if maximum ionic densities are 3 x 106
1.58 x 103
15.58 x 106
15.58 kHz
None of the above
1
2
15
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