Discussion
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- Question
In the given figure shows a 10dB directional coupler. If power input at port 1 is 100 mW, power output at port 3 is
Options- A. 10 mW
- B. 15 mW
- C. 20 mW
- D. 25 mW
- Correct Answer
- 10 mW
- 1. A microwave connector should have high SWR.
Options- A. True
- B. False Discuss
- 2. In microwave communication links the fading due to rain occurs. The methods to solve this problem include
Options- A. antenna replacement and feed correction
- B. amplitude trimming and phase correction
- C. polarization shifting and code diversity
- D. path diversity and frequency diversity Discuss
- 3. Oscillations are obtained from a reflex klystron only for combinations of anode voltage and repeller voltage that give a favourable transit time.
Options- A. True
- B. False Discuss
- 4. In 8 cavity magnetron the p mode corresponds to a total phase shift equal to
Options- A. ± 8 p radians around the periphery
- B. ± 4 p radians around the periphery
- C. ± 2 p radians around the periphery
- D. ± 16 p radians around the periphery Discuss
- 5. Which of the following statements is not correct regarding modes of electromagnetic energy transmission?
Options- A. In TE mode the direction of electric field is always and everywhere transverse to the direction of propagation
- B. In TM mode the magnetic field pattern is always and everywhere transverse to the direction of propagation
- C. The subscripts is TE and TM designations denote the number of half sine wave variations of the field components in x and y directions respectively.
- D. TM11 is called the dominant mode. Discuss
- 6. In Gunn diode electrons are transferred from
Options- A. Ridge guide is essentially a form of capacitively loaded guide
- B. low to high mobility energy bands
- C. valley to domain formation
- D. domain to valley formation Discuss
- 7. 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
- 8. 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
- 9. 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
- 10. 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
Microwave Communication problems
Search Results
Correct Answer: False
Correct Answer: path diversity and frequency diversity
Correct Answer: True
Correct Answer: ± 8 p radians around the periphery
Correct Answer: TM11 is called the dominant mode.
Correct Answer: Ridge guide is essentially a form of capacitively loaded guide
Correct Answer: 3 to 6 GHz
Correct Answer:
Correct Answer: 20 dB
Correct Answer: both (a) and (b)
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