MICROWAVE COMMUNICATION QUIZ

Which causes multipath or frequency selective fading?

Further reflector

Large reflector

Nearer reflector

Small reflector

TRUE ANSWER : ?
YOUR ANSWER : ?

The coarse frequency adjustment of a reflex klystron is accomplished by

The AFC system

Varying the repeller voltage

An adjustment in the synchronizer

Adjusting the flexible wall of the resonant cavity

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YOUR ANSWER : ?

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 be increased

Must remain as before

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YOUR ANSWER : ?

A magnetron is operated at a duty cycle of 0.001. It has a peak power output of 100 kilo-watts. Its average power is

1,000 watts

100 watts

10,000 watts

1,000,000 watts

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YOUR ANSWER : ?

The antenna separations (in meters) required for optimum operation of a space diversity system can be calculated from:where R = effective earth radius (m) and L = path length (m)

S = λR/L

S = λR/RL

S = 3λR/L

S = 2λR/L

TRUE ANSWER : ?
YOUR ANSWER : ?

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 dimension of each cavity resonator

The number of the cavity resonators

The flux density of the external magnet

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YOUR ANSWER : ?

It is possible to increase the maximum range of a radar equipment by

Lowering the pulse frequency

Narrowing the beam width and increasing the pulse duration

Raising the peak power of the transmitter

All of these

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YOUR ANSWER : ?

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

To slow down the signal on the helix

To keep the electrons from spreading out

To velocity modulate the electron beam

To accelerate the electron

TRUE ANSWER : ?
YOUR ANSWER : ?

If the instantaneous RF potentials on the two sides of a magnetron cavity are of opposite polarity, the operation is in the

π mode

2π mode

π/4 mode

π/2 mode

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YOUR ANSWER : ?

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?

Wave trap

Circulator

Tunnel diode

Isolator

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YOUR ANSWER : ?

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