Discussion
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- Question
For a 1 cm x 2 cm air filled rectangular waveguide the maximum frequency should be less than about
Options- A. 1000 MHz
- B. 5000 MHz
- C. 14000 MHz
- D. 140000 MHz
- Correct Answer
- 14000 MHz
- 1. TE01 mode of propagation of electromagnetic energy
Options- A. is merely the TE10 mode rotated 90°
- B. is merely the TE10 mode rotated 180°
- C. is the same as TE10 mode
- D. either (b) or (c) Discuss
- 2. A line is excited by a 100 V, 200 ohm source and is terminated by 100 ? resistance. If the voltage on line reaches steady value in 80 ns, the natural resonant frequency is
Options- A. 100 MHz
- B. 50 MHz
- C. 12.5 MHz
- D. 6.25 MHz Discuss
- 3. In TE10 mode of rectangular waveguide
Options- A. there is one half sine wave variation along x direction and one along y direction
- B. there is one half sine wave variation along y direction and one along x direction
- C. there is one full sine wave variation along x direction and one along y direction
- D. none of the above Discuss
- 4. The total power radiated from an antenna system is determined by imagining that the antenna is at the centre of a very large
Options- A. sphere
- B. rectangle
- C. square
- D. ellipse Discuss
- 5. Reflection from the object to be measured is significant only when the wavelength is
Options- A. much bigger than the size of object
- B. much smaller than the size of object
- C. almost of the size of object
- D. either (a) or (c) Discuss
- 6. A PIN diode can be used
Options- A. as a shunt mounted switch
- B. as a series mounted switch
- C. both as series or shunt mounted switch
- D. non of the above Discuss
- 7. As frequency is increased, the skin effect
Options- A. increases
- B. decreases
- C. remains the same
- D. either (b) or (c) Discuss
- 8. At millimeter wavelength the favoured mode in circular wave guide is
Options- A. TE01
- B. TE11
- C. TE20
- D. TE21 Discuss
- 9. In a TWT the phase velocity of the axial component of the field on the slow wave structure is kept
Options- A. equal to velocity of electron
- B. slightly less than velocity of electron
- C. slightly more than velocity of electron
- D. equal to velocity of light in free space Discuss
- 10. Microwaves
Options- A. get reflected by ionosphere
- B. are absorbed by ionosphere
- C. are neither reflected nor absorbed by ionosphere
- D. are both reflected and absorbed by ionosphere Discuss
Microwave Communication problems
Search Results
Correct Answer: is merely the TE10 mode rotated 90°
Correct Answer: 12.5 MHz
Correct Answer: there is one half sine wave variation along x direction and one along y direction
Correct Answer: sphere
Correct Answer: much smaller than the size of object
Correct Answer: both as series or shunt mounted switch
Correct Answer: increases
Correct Answer: TE01
Correct Answer: equal to velocity of electron
Correct Answer: are neither reflected nor absorbed by ionosphere
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