Discussion
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- Question
In a rectangular waveguide cutoff wavelength for TE10 mode is 8 cm. Then cutoff wavelength for TE20 mode is
Options- A. 8 cm
- B. 6 cm
- C. 4 cm
- D. 2 cm
- Correct Answer
- 4 cm
- 1. A waveguide twist is used to change the plane of polarization.
Options- A. True
- B. False Discuss
- 2. In a rectangular waveguide
Options- A. the broad width is generally labelled 'a' and height 'b'
- B. the broad width is generally labelled 'b' and height 'a'
- C. any one of the dimensions may be labelled 'a' and the other 'b'
- D. the length is labelled as 'a' Discuss
- 3. In rectangular waveguides the ratio of width to height is about
Options- A. 0.5
- B. 1
- C. 2
- D. 4 Discuss
- 4. Standard mismatches are used to calibrate SWR and impedance measuring equipments.
Options- A. True
- B. False Discuss
- 5. A 'rat race' is a
Options- A. hybrid junction for microwaves
- B. a microwave oscillator
- C. a microwave amplifier
- D. a microwave antenna Discuss
- 6. The use of coaxial microwave line should be restricted to frequencies
Options- A. below cut off frequency of TE11 mode
- B. above cut off frequency of TE11 mode
- C. at frequencies much lower than cut off frequency of TE11 mode
- D. at frequencies much higher than cut off frequency of TE11 mode Discuss
- 7. In a cable with ?r = 4, the wave velocity is
Options- A. 3 x 108 m/s
- B. 0.75 x 108 m/s
- C. 1.5 x 108 m/s
- D. 108 m/s Discuss
- 8. If QL is loaded Q, QE is external Q and QU is unloaded Q of a microwave resonator, then
Options- A.
- B.
- C.
- D. QL = QE + QU Discuss
- 9. The main advantage of using micro waves for communications is
Options- A. large bandwidth
- B. small bandwidth
- C. low power
- D. high power Discuss
- 10. TE10 mode of propagation of electromagnetic energy in waveguides can be thought of as
Options- A. three TEM waves travelling along length of wave-guide
- B. One TEM wave travelling along length of wave guide and one TEM wave propagation in the transverse plane
- C. One TEM wave travelling along the length of wave guide and two TEM waves
- D. none of the above Discuss
Microwave Communication problems
Search Results
Correct Answer: True
Correct Answer: the broad width is generally labelled 'a' and height 'b'
Correct Answer: 2
Correct Answer: True
Correct Answer: hybrid junction for microwaves
Correct Answer: below cut off frequency of TE11 mode
Correct Answer: 1.5 x 108 m/s
Correct Answer:
Correct Answer: large bandwidth
Correct Answer: One TEM wave travelling along the length of wave guide and two TEM waves
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