Exercise: Microwave Communication

Questions for: Microwave Communication

If QL is loaded Q, QE is external Q and QU is unloaded Q of a microwave resonator, then
A:
B:
C:
D:
QL = QE + QU
Answer: A
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Generally the wall thickness of rectangular waveguide is
A:
about 1-5 mils
B:
about 40-100 mils
C:
about 0.1 to 0.5 mils
D:
about 500 mils
Answer: B
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The use of coaxial microwave line should be restricted to frequencies
A:
below cut off frequency of TE11 mode
B:
above cut off frequency of TE11 mode
C:
at frequencies much lower than cut off frequency of TE11 mode
D:
at frequencies much higher than cut off frequency of TE11 mode
Answer: A
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Consider the following statements
  1. Fading of signals is generally greatest near radio horizon.
  2. Fading of signals is generally greatest in shadow zone.
  3. Fading is small when a good optical path is present.
Which of the above statements are correct?
A:
1, 2 and 3
B:
1 and 2 only
C:
1 and 3 only
D:
2 and 3 only
Answer: A
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In a backward wave oscillator the efficiency
A:
is much higher than in TWT
B:
is much lower than in TWT
C:
is almost the same as in TWT
D:
either (a) or (b)
Answer: C
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