Electronics and Communication Engineering - Microwave Communication

46.
Oscillations are obtained from a reflex klystron only for combinations of anode voltage and repeller voltage that give a favourable transit time.
True
False
Answer: Option
Explanation:
No answer description is available. Let's discuss.

47.
In the given figure shows a 10dB directional coupler. If power input at port 1 is 100 mW, power output at port 3 is
10 mW
15 mW
20 mW
25 mW
Answer: Option
Explanation:
No answer description is available. Let's discuss.

48.
The noise figure of klystron amplifier is about
25 dB
3 dB
zero
1 dB
Answer: Option
Explanation:
No answer description is available. Let's discuss.

49.
Which one of the following is true for EM wave propagation through rectangular waveguide of cross-section 2a x a
critical wavelength for TE10 mode is the same as that for TE02 mode
critical wavelength for TE10 mode is one half of that for TE10 mode
critical wavelength for TE10 mode is the same as that for TM10 mode
critical wavelength for TE10 mode is double that for TE01mode
Answer: Option
Explanation:
No answer description is available. Let's discuss.

50.
In the given figure the line voltage after a number of reflections will be
30 V
-30 V
10 V
-10 V
Answer: Option
Explanation:
No answer description is available. Let's discuss.