Microwave Communication problems
- 1. The usable bandwidth of ridge wave guide
Options- A. is lower than that of rectangular waveguide
- B. is higher than that of rectangular waveguide
- C. is almost same as that of rectangular waveguide
- D. is very small as compared to that of rectangular waveguide Discuss
Correct Answer: is higher than that of rectangular waveguide
- 2. A short circuited stub is preferred to an open circuited stub because an open circuited stub
Options- A. is more difficult to fabricate and construct
- B. is made of transmission line of different Z0
- C. is liable to radiate
- D. is incapable of giving full range of reactance Discuss
Correct Answer: is liable to radiate
- 3. A square waveguide carries TE11 mode whose axial magnetic field is given by Hz = H0
, where the guide dimensions are in cms. The cut off frequency of the mode is
Options- A. 5 GHz
- B. 7.5 GHz
- C. 6.5 GHz
- D. 8 GHz Discuss
Correct Answer: 7.5 GHz
- 4. If air pressure in a rectangular waveguide is increased the maximum power handling capacity
Options- A. is decreased
- B. is increased
- C. remains the same
- D. may increase or decrease depending on pressure Discuss
Correct Answer: is increased
- 5. The noise figure of klystron amplifier is about
Options- A. 25 dB
- B. 3 dB
- C. zero
- D. 1 dB Discuss
Correct Answer: 25 dB
- 6. If the peak transmitted power in a radar is increased by a factor 81, the maximum range is increased by a factor of
Options- A. 3
- B. 9
- C. 27
- D. 81 Discuss
Correct Answer: 3
- 7. 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
Correct Answer: TM11 is called the dominant mode.
- 8. 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
Correct Answer: ± 8 p radians around the periphery
- 9. 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
Correct Answer: True
- 10. 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
Correct Answer: path diversity and frequency diversity
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