MICROWAVE COMMUNICATION QUIZ

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

Echosounder

Fathometer

LORAN

SONAR

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A PPI cathode-ray tube as used on a radar set

Is used to check the percentage of modulation

Is used for receiver alignment

Indicates only the range of a target

Indicates both the range and azimuth of a target

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At what position is the input signal inserted into a traveling-wave tube?

At the cathode end of the helix

At the collector

At the collector end of the helix

At the control grid of the electron gun

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A Class-S Emergency Position-Indicating Radio Beacon (E.P.I.R.B)

Must be capable of floating or being secured to a survival

May be tested during the first five minutes of any hour

All of these

Must have its battery replaced after emergency use

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The main frequency determining element of a klystron is

The accelerating voltage

Its resonant cavity

Its mode of operation

The repeller voltage

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As the electron beam moves through a klystron’s intercavity drift space

Velocity modulation at the input cavity creates density modulation at the output cavity

Density modulation at the input cavity creates velocity modulation at the output cavity

Phase modulation at the input cavity creates velocity modulation at the output cavity.

Frequency modulation at the input cavity creates velocity modulation at the output cavity

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Which of the following permits a microwave signal to travel in one direction with virtually no loss, but severely attenuates any signal attempting to travel in the reverse direction?

Circulator

Tunnel diode

Wave trap

Isolator

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The resonant frequency of a cavity resonator depends upon

Its physical dimensions

The mode of operation

Its electrical dimensions

The capacitor which tunes it

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What do you call an attenuation that occurs over many different wavelengths of the carrier?

Slow fading

Rician fading

Rayleigh fading

Wavelength fading

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

8493 mmi

6370 km

6370 mi

8493 km

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