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Electronics and Communication Engineering - Electromagnetic Field Theory

Exercise : Electromagnetic Field Theory - Section 12
6.
The wave in wave guide has
group velocity inversely proportional to wavelength
larger frequency than in the free space
diminishing wavelength than in the free space
larger wavelength than in the free space
Answer: Option
Explanation:
No answer description is available. Let's discuss.
7.
While determining antenna height for terrestrial microwaves links, the effect of refraction from the atmosphere is taken care of by considering the effective curvature of the earth to be
times the radius of the earth (Re)
Re
Re
Re
Answer: Option
Explanation:
No answer description is available. Let's discuss.
8.
A T.V. station works at 300 MHz and radiates 100 kW of power. This signal received at a distance of 200 km will be
a few μV/m due to attenuation by atmosphere
1-5 mV due to ionospheric reflection
nil since propagation is line of sight
nil because signal fades completely at 300 MHz
Answer: Option
Explanation:
No answer description is available. Let's discuss.
9.
The power gain of a half-wave dipole with respect to an isotropic radiator is
2.15 db
3 db
4.15 db
6 db
Answer: Option
Explanation:
No answer description is available. Let's discuss.
10.
In an impedance smith chart, a clockwise movement along a constant resistance circle gives rise to
decrease in the value of reactance
an increase in the value of reactance
no change in the reactance value
no change in the impedance value
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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