Discussion
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- Question
In which of the following devices can the operation be visualised in terms of a series feedback loops?
Options- A. TWT
- B. Reflex klystron
- C. Klystron amplifier
- D. Backward wave oscillator
- Correct Answer
- Backward wave oscillator
- 1. The characteristic impedance of a cable is about
Options- A. 300 ?
- B. 50 ?
- C. 5 ?
- D. 2 ? Discuss
- 2. In a high frequency coaxial line and the length of line characteristic impedance is a function of
Options- A. properties of insulating material only
- B. inner and outer conductor radius only
- C. both (a) and (b)
- D. neither (a) nor (b) Discuss
- 3. For a directional coupler the power is in the ratio of
Options- A. 40 dB
- B. 30 dB
- C. 20 dB
- D. 10 dB Discuss
- 4. If ?r is relative permeability, ?r is relative permittivity, c is velocity of light fc is cutoff frequency, phase velocity vp (i.e., speed with which a particular phase of the wave travels down a rectangular waveguide at frequency f) is given by
Options- A.
- B.
- C.
- D.
Discuss
- 5. Satellite communication systems use the frequency band
Options- A. 10 to 20 MHz
- B. 50 to 70 MHz
- C. 3 to 6 GHz
- D. 100 to 120 GHz Discuss
- 6. Assertion (A): In TE mode for rectangular waveguide.
Reason (R): In TM mode for rectangular waveguide.
Options- A. Both A and R are correct and R is correct explanation of A
- B. Both A and R are correct but R is not correct explanation of A
- C. A is correct but R is wrong
- D. A is wrong but R is correct Discuss
- 7. The secondary constants of a line are
Options- A. Z0
- B. Z0 and ?
- C. Z0, ? and wave velocity
- D. Z0, ? and L Discuss
- 8. To ensure that only dominant TE10 mode propagates in a rectangular waveguide, the operating frequency
Options- A. must be more than cutoff frequency of TE10 mode
- B. must be less than cutoff frequency of TE20 mode
- C. must be more than cutoff frequency of TE10 mode and less than cutoff frequency of TE20 mode
- D. must be less than cutoff frequency of TE10 mode Discuss
- 9. Z0 = (Zoc Zsc)0.5
Options- A. True
- B. False Discuss
- 10. Characteristic impedance of a coaxial cable is inversely proportional to ?r.
Options- A. True
- B. False Discuss
Microwave Communication problems
Search Results
Correct Answer: 50 ?
Correct Answer: both (a) and (b)
Correct Answer: 20 dB
Correct Answer:
Correct Answer: 3 to 6 GHz
Correct Answer: Both A and R are correct but R is not correct explanation of A
Correct Answer: Z0 and ?
Correct Answer: must be more than cutoff frequency of TE10 mode and less than cutoff frequency of TE20 mode
Correct Answer: True
Correct Answer: True
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