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Microwave Communication

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

Reflex-klystron
Thyratron
Magnetron
Klystron

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Microwave Communication
Oscillators of a klystron tube are maintained

By circulating bunches of electrons within the cavities.
By bunches of electrons passing the cavity grids
By plate-to-cathode feedback
By feedback between the accelerating grid and the repeller

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

Attenuation
Modulation
Radiation
Propagation

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Microwave Communication
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?

Tunnel diode
Isolator
Wave trap
Circulator

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

Gunn diode
Reflex klystron
Magnetron
Traveling-wave tube

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Microwave Communication
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 number of the cavity resonators
The flux density of the external magnet
The dimension of each cavity resonator

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