Exercise: Electromagnetic Field Theory

Questions for: Electromagnetic Field Theory

Antenna used for T.V. broadcasting is
A:
long dipole
B:
metal horn
C:
crossed dipole
D:
log periodic
Answer: C
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Which of the following is a better propagation mode to propagate television frequency modulation and radar signals?
A:
Satellite communication
B:
Ground propagation
C:
Polarized communication
D:
None of the above
Answer: A
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The attenuation constant in case of a transmission line is
A:
B:
C:
D:
Answer: C
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Consider an arbitrary distribution of conducting bodies in a charge free space according to the uniqueness theorem, which of following are required to be specified in order that the field is uniquely determined everywhere?
  1. Total charge on each conductor
  2. Potential at each conductor surface
  3. Potential at same of conductor and total charge on the remainder
  4. Total charge as well as potential gradient on each conductor surface
Select the correct answer using the codes given below codes
A:
1 and 3
B:
2 and 4
C:
1, 2, and 3
D:
1, 2, 3, 4
Answer: B
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Cassegrain feed is used with a parabolic reflection to
A:
reduce the size of the main reflector
B:
increase the gain of the system
C:
increase the beamwidth of the system
D:
allow the feed to be placed at a convenient point
Answer: D
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