Exercise: Electromagnetic Field Theory

Questions for: Electromagnetic Field Theory

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:
a few ΞV/m due to attenuation by atmosphere
B:
1-5 mV due to ionospheric reflection
C:
nil since propagation is line of sight
D:
nil because signal fades completely at 300 MHz
Answer: C
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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
A:
times the radius of the earth (Re)
B:
Re
C:
Re
D:
Re
Answer: C
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The wave in wave guide has
A:
group velocity inversely proportional to wavelength
B:
larger frequency than in the free space
C:
diminishing wavelength than in the free space
D:
larger wavelength than in the free space
Answer: D
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A square corner reflector is used in
A:
radio astronomy
B:
tv broadcast
C:
point to point communication
D:
all of the above
Answer: D
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An electric charge Q is placed in a dielectric medium which of the following quantities are independent of the dielectric constant Îĩ of the medium
A:
electric potential V and electric field intensity E
B:
displacement density D and displacement φ
C:
electric field intensity E and displacement φ
D:
electric potential V and displacement φ
Answer: B
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