10 JANUARY 2021 CURRENT AFFAIRS QUIZ

Klystron oscillators are most often used in the frequency range of

30 to 30000 MHz

300 to 3000 MHz

10 to 10000 MHz

3000 to 30000 MHz

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

Tunnel diode

Both B and C

Thyratron tube

Klystron tube

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The resonant frequency of a cavity resonator depends upon

The mode of operation

Its electrical dimensions

Its physical dimensions

The capacitor which tunes it

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Oscillators of a klystron tube are maintained

By bunches of electrons passing the cavity grids

By circulating bunches of electrons within the cavities.

By plate-to-cathode feedback

By feedback between the accelerating grid and the repeller

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Theoretically electromagnetic radiation field strength varies in inverse proportion to the square of the distance, but when atmospheric attenuation effects and the absorption of the terrain are taken into account the attenuation can be as high as the inverse ___________ power of the distance.

Fourth

Fifth

Third

Sixth

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__________ is the progressive decrease of signal strength with increasing distance.

Attenuation

Modulation

Radiation

Propagation

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

Gunn diode

Traveling-wave tube

Reflex klystron

Magnetron

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A Class-S Emergency Position-Indicating Radio Beacon (E.P.I.R.B)

Must be capable of floating or being secured to a survival

All of these

Must have its battery replaced after emergency use

May be tested during the first five minutes of any hour

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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

May be decreased

Must be doubled

Must remain as before

Must be increased

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The cavity resonator

Has a low Q factor for narrow operation.

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

Is equivalent to an LC resonant circuit

Produces a frequency which is independent of the cavity size.

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