Electronics and Communication Engineering - Microwave Communication

31. 

Klystron amplifier is not used to amplifier very weak microwave signals due to

A. low gain for weak signals
B. low noise for weak signals
C. high noise
D. both (a) and (b)

Answer: Option C

Explanation:

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32. 

Which of the following modes in circular waveguides are circularly symmetric?

A. TE01
B. TE02
C. both (a) and (b)
D. neither (a) nor (b)

Answer: Option C

Explanation:

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33. 

Which of the following lines behaves as infinite line?

A. a line terminated in inductance
B. a line terminated in capacitance
C. a short line
D. a line terminated in z0

Answer: Option D

Explanation:

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34. 

A rectangular waveguide has two stubs each length connected at the source end. The stubs are short circuted. Then

A. the longitudinal current is power current and current in stubs is reactive
B. the longitudinal current is reactive current and current in stubs is power current
C. both power and reactive exists in both longitudinal direction and stubs
D. the current in stubs is zero

Answer: Option A

Explanation:

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35. 

Performance of a PIN diode switch is represented by

A. insertion loss when switch is off
B. insertion loss when switch is on
C. insertion loss when switch is on and isolation loss when switch is off
D. insertion loss when switch is off and isolation loss when switch is on

Answer: Option C

Explanation:

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