MICROWAVE COMMUNICATION QUIZ

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

π/4 mode

π/2 mode

π mode

2π mode

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

A low repetition rate

A narrow, antenna-beam width in the vertical plane

A high duty cycle

A narrow, antenna-beam width in the horizontal plane

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

A Rochelle salts crystal

And FET

A silicon crystal

A tunnel diode

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Oscillators of a klystron tube are maintained

By feedback between the accelerating grid and the repeller

By circulating bunches of electrons within the cavities.

By plate-to-cathode feedback

By bunches of electrons passing the cavity grids

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Rainfall is an important factor for fading of radio waves at frequencies above

100 GHz

100 MHz

10 GHz

1 GHz

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Which of the following is used as an oscillator device in the SHF band?

Tunnel diode

Thyratron tube

Both B and C

Klystron tube

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

Magnetron

Klystron

Thyratron

Reflex-klystron

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The aquadag coating on the inside of PPI tube is used

To focus the beam of primary electrons

To shield the electron beam from unidirectional magnetic

All of these

As a second anode and to prevent the build-up of secondary field

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Which of the following operating frequencies is used for the modern loran navigational system?

Loran D: 10.2 kHz

Loran B: 900 kHz

Loran A: 1950 kHz

Loran C: 100 kHz

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Klystron oscillators are most often used in the frequency range of

10 to 10000 MHz

300 to 3000 MHz

30 to 30000 MHz

3000 to 30000 MHz

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