Electronics and Communication Engineering - Microwave Communication

1. 

Which one of the following is also called 'rat race'?

A. E plane tee
B. H plane tee
C. Magic tee
D. Hybrid ring

Answer: Option D

Explanation:

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2. 

Radar principle is used in

A. detection of aircraft
B. burglar alarms
C. garage door openers
D. all of the above

Answer: Option D

Explanation:

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3. 

In an optional fiber the refractive index of cladding material should be

A. nearly 1
B. very low
C. less than that of core
D. more than that of core

Answer: Option C

Explanation:

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4. 

In microwave circuits, a mode transducer is used to

A. change mode of wave transmission
B. change direction of wave transmission
C. change polarization of wave transmission
D. change mode, direction or polarization wave transmission

Answer: Option D

Explanation:

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5. 

A waveguide connected to a circularly polarized antenna must be able to efficiently propagate both vertically and horizontally polarised waves.

A. True
B. False

Answer: Option A

Explanation:

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