Electronics and Communication Engineering - Microwave Communication

21. 

Compared to coaxial lines, the advantages of wave guides are

A. higher power handling capacity
B. lower loss per unit length
C. cheaper and simple mechanical structure
D. all of the above

Answer: Option D

Explanation:

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22. 

Standard mismatches are used to calibrate SWR and impedance measuring equipments.

A. True
B. False

Answer: Option A

Explanation:

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23. 

As compared to LED, LASER has

  1. higher emission efficiency
  2. no tuning arrangement
  3. narrow spectral width
  4. provision for confinement
Of these statements

A. 1, 2, 3 are correct
B. 1, 2, 4 are correct
C. 1 and 3 are correct
D. 1, 3, 4 are correct

Answer: Option D

Explanation:

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24. 

Microwaves are used for

A. telephony
B. radio broadcast
C. TV systems
D. all of the above

Answer: Option D

Explanation:

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25. 

In a shield helix

A. the spacing between adjacent turns is very large
B. the spacing between adjacent turns approaches zero
C. the spacing between adjacent turns approaches zero and wire thickness approaches zero
D. the spacing between adjacent turns is very large wire thickness approaches zero

Answer: Option C

Explanation:

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