MICROWAVE COMMUNICATION QUIZ

A high-power microwave pulse of the order of megawatts can be generated by a

Reflex klystron

Traveling-wave tube

Gunn diode

Magnetron

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The cavity resonator

Produces a frequency which is independent of the cavity size.

In a reflect klystron has its output taken from the reflector plate

Has a low Q factor for narrow operation.

Is equivalent to an LC resonant circuit

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

Waveguide match

Cavity match

Direct coax-helix match

All of these

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

Slow fading

Wavelength fading

Rician fading

Rayleigh fading

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In a pulsed radar set, the function of the duplexer is to

Aid in calibrating the display unit

Prevent frequency drift in the klystron

All of these

Allow the transmitter and the receiver to operate from a common antenna

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If the duration of the radar transmitted pulse, on a particular range of operation, is increased, the required bandwidth of the receiver’s IF amplifiers

Must be increased

Must remain as before

May be decreased

Must be doubled

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The frequency of the oscillation generated by a magnetron, is mainly determined by

The ratio of the dc cathode voltage to the magnetic flux density

The flux density of the external magnet

The number of the cavity resonators

The dimension of each cavity resonator

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

6370 mi

8493 km

6370 km

8493 mmi

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In a pulsed radar set, the STC circuit is used to

Increases receiver sensitivity for echoes from targets

Vary the pulse frequency in order to control the maximum target

Improve the target bearing resolution

Reduce interference from the effects of sea return

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What allow microwave to pass in only one direction?

Varactor-triac

RF emitter

Ferrite emitter

Capacitor

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