Microwave Communication problems
- 1. 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
Correct Answer: below cut off frequency of TE11 mode
- 2. 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
Correct Answer: 1.5 x 108 m/s
- 3. 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
Correct Answer:
- 4. The main advantage of using micro waves for communications is
Options- A. large bandwidth
- B. small bandwidth
- C. low power
- D. high power Discuss
Correct Answer: large bandwidth
- 5. 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
Correct Answer: One TEM wave travelling along the length of wave guide and two TEM waves
- 6. Assertion (A): An artificial transmission line can be used as a pulse generator.
Reason (R): A pulse function is used very frequently in network analysis.
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
Correct Answer: Both A and R are correct but R is not correct explanation of A
- 7. Power monitor and reflectometer use the principle of
Options- A. directional coupler
- B. klystron amplifier
- C. Gunn diode
- D. TWT Discuss
Correct Answer: directional coupler
- 8. Dielectric constant and conductivity of rocky soil and flat sandy soil are around
Options- A. 10 and 20 mho/cm respectively
- B. 20 and 10 mho/cm respectively
- C. 2 and 5 mho/cm respectively
- D. 0.5 and 2 mho/cm respectively Discuss
Correct Answer: 10 and 20 mho/cm respectively
- 9. Consider the following statements, SWR of a transmission line is infinite when the load is
- a short circuit
- a complex impedance
- an open circuit
- a pure reactance
Options- A. 1 and 3 only
- B. 1, 2, 3
- C. 2, 3, 4
- D. 1, 2, 4 Discuss
Correct Answer: 1 and 3 only
- 10. Compared to coaxial lines, the advantages of wave guides are
Options- A. higher power handling capacity
- B. lower loss per unit length
- C. cheaper and simple mechanical structure
- D. all of the above Discuss
Correct Answer: all of the above
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