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Electronics and Communication Engineering - Microwave Communication

Exercise : Microwave Communication - Section 4
1.
The domain mode in rectangular waveguide is
TE01
TE02
TE10
TM11
Answer: Option
Explanation:
No answer description is available. Let's discuss.
2.
The reverse voltage applied to a varactor diode
is less than avalanche breakdown voltage
is more than avalanche breakdown voltage
may be more or less than a avalanche breakdown voltage
is very high as compared to avalanche breakdown voltage
Answer: Option
Explanation:

The action of varactor diode is due to the capacitance of depletion layer. The thickness of depletion layer depends on the reverse bias which should not cause breakdown.

3.
To ensure that only dominant mode TE10 is allowed to propagate in an air filled rectangular waveguide, the lower frequency limit and upper frequency limit are
about 25% above fc for TE10 and 5% below fc for TE20 mode respectively
about 50% above fc for TE10 and 25% below fc for TE20 mode respectively
about 25% above fc for TE10 and 25% below fc for TE20 mode respectively
none of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
4.
The skin depth at 1000 MHz as compared to that at 500 MHz is
2
12
0.707
0.5
Answer: Option
Explanation:
No answer description is available. Let's discuss.
5.
The transit time (in cycles) for electrons in repeller space of reflex klystron oscillator for sustaining oscillations is (n is any integer)
2(n - 1)
2n - 1
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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