MICROWAVE COMMUNICATION QUIZ

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

A silicon crystal

And FET

A tunnel diode

A Rochelle salts crystal

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A traveling-wave tube (TWT) amplifies by virtue of

The effect of an external magnetic field

The energy contained the cavity resonators

The energy liberated form the collector

The absorption of energy by the signal from an electron stream

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

The flux density of the external magnet

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

The dimension of each cavity resonator

The number of the cavity resonators

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When it is desired that short-range targets be clearly seen on a pulsed-radar set, it is important that the receiver and display system have

The shortest possible time

Low-pass filters

A long time constant

The restricted high-frequency response

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The highest frequency which a conventional vacuum tube oscillator can generate is not limited by the

Electron transit time

Distributed lead inductance

Degree of emission from the cathode

Inter-electrode capacitance

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A thin layer of dirt and grime coverts the reflecting surface of the parabolic dish of a radar set. The particular effect on the performance of the radar will be

A decrease in range

A reduction in horizontal resolution

No noticeable effect

A decrease in gain

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Which of the following is used as a high power microwave oscillator?

Klystron

Magnetron

Thyratron

Reflex-klystron

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The Gunn diode oscillator

Operates over a positive resistance characteristic

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

Depends on the formation of charge domain

Generates frequencies which are below 100 MHz

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

A high duty cycle

A narrow, antenna-beam width in the vertical plane

A low repetition rate

A narrow, antenna-beam width in the horizontal plane

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Klystron oscillators are most often used in the frequency range of

30 to 30000 MHz

300 to 3000 MHz

3000 to 30000 MHz

10 to 10000 MHz

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