Exercise: Microwave Communication

Questions for: Microwave Communication

In which mode of circular waveguide does the attenuation continuously decrease as frequency is increased?
A:
TE01
B:
TE11
C:
TE05
D:
TE21
Answer: A
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The first and second subscripts in models of circular waveguides depict
A:
the number of full sine wave variations in circumference in direction and Bessel function variations in radial direction respectively
B:
the Bessel function variations in radial direction and the number of full sine wave variations in circumference direction respectively
C:
the Bessel function variations in circumference direction and number of full sine wave variations in radial direction respectively
D:
none of the above
Answer: A
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In which of the following devices can the operation be visualised in terms of a series feedback loops?
A:
TWT
B:
Reflex klystron
C:
Klystron amplifier
D:
Backward wave oscillator
Answer: D
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If the repeller voltage in a klystron oscillator is increased the transit time of electron
A:
will be increased
B:
will be decreased
C:
will remain the same
D:
either (a) or (b)
Answer: C
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A microstrip line has ∈r = 9. The normalised wavelength is about
A:
10
B:
2
C:
1
D:
0.4
Answer: D
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