Electronics and Communication Engineering - Microwave Communication

26. 

The rotation of direction of E field of a linearly polarized wave passing through a magnetised ferric medium is called

A. Lorentz rotation
B. Faraday rotation
C. Steinmitz rotation
D. Fleming's rotation

Answer: Option B

Explanation:

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27. 

If air pressure in a rectangular waveguide is increased the maximum power handling capacity

A. is decreased
B. is increased
C. remains the same
D. may increase or decrease depending on pressure

Answer: Option B

Explanation:

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28. 

A directional coupler is used to determine

A. rv
B. rv and VSWR
C. L and C
D. wave velocity

Answer: Option B

Explanation:

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29. 

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

A. 5 GHz
B. 7.5 GHz
C. 6.5 GHz
D. 8 GHz

Answer: Option B

Explanation:

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30. 

For air filled circular waveguides

A. the attenuation due to imperfect conducting walls is negligible
B. the attenuation due to imperfect dielectric is negligible
C. both the attenuation i.e. due to imperfect conducting walls and due to imperfect dielectric are significant
D. the total attenuation is almost zero

Answer: Option B

Explanation:

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