MICROWAVE COMMUNICATION QUIZ

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

To accelerate the electron

To velocity modulate the electron beam

To keep the electrons from spreading out

To slow down the signal on the helix

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The Gunn diode oscillator

Generates frequencies which are below 100 MHz

Depends on the formation of charge domain

Operates over a positive resistance characteristic

Is capable of generating continuous microwave power of the order of kilowatt

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In an SHF pulsed radar set, a reflex klystron can be used as a

Local oscillator

Transmitter oscillator

Duplexer stage

Single mixer stage

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To achieve good bearing resolution when using a pulsed-radar set, an important requirement is

A narrow, antenna-beam width in the vertical plane

A high duty cycle

A narrow, antenna-beam width in the horizontal plane

A low repetition rate

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What allow microwave to pass in only one direction?

Capacitor

Ferrite emitter

RF emitter

Varactor-triac

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Which causes multipath or frequency selective fading?

Small reflector

Large reflector

Nearer reflector

Further reflector

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

Delayed spreading

Rayleigh fading

Random Doppler shift

Slow fading

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In a radar-set receiver, the usual mixer stage is

A silicon crystal

A tunnel diode

A Rochelle salts crystal

And FET

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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 doubled

May be decreased

Must remain as before

Must be increased

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If k-factor is greater than 1, the array beam is bent

Away from the earth

Towards the earth

Towards the outer space

Towards the ionosphere,

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