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Microwave Communication

Microwave Communication
What allow microwave to pass in only one direction?

Capacitor
Varactor-triac
Ferrite emitter
RF emitter

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Microwave Communication
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

10,000 watts
1,000 watts
100 watts
1,000,000 watts

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Microwave Communication
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.

Sixth
Fifth
Fourth
Third

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Microwave Communication
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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Microwave Communication
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 increased
Must be doubled
Must remain as before

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

Loran C: 100 kHz
Loran D: 10.2 kHz
Loran A: 1950 kHz
Loran B: 900 kHz

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