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Microwave Communication

Microwave Communication
Calculate the effective earth’s radius if the surface refractivity is 301.

8493 km
6370 km
6370 mi
8493 mmi

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Microwave Communication
A shipboard equipment which measures the distance between the ship’s bottom and the ocean floor.

Echosounder
LORAN
SONAR
Fathometer

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Microwave Communication
Which causes multipath or frequency selective fading?

Large reflector
Small reflector
Further reflector
Nearer reflector

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Microwave Communication
In microwave transmission using digital radio, what causes most intersymbol interference?

Rayleigh fading
Slow fading
Delayed spreading
Random Doppler shift

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Microwave Communication
Coupling into and out of a traveling-wave tube can be accompanied by a

Direct coax-helix match
All of these
Waveguide match
Cavity match

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Microwave Communication
What is the purpose of the electromagnetic field which surrounds a traveling-wave tube?

To accelerate the electron
To slow down the signal on the helix
To velocity modulate the electron beam
To keep the electrons from spreading out

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MORE MCQ ON Microwave Communication

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