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