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Microwave Communication

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
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

No noticeable effect
A decrease in range
A decrease in gain
A reduction in horizontal resolution

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Microwave Communication
Coupling into and out of a traveling-wave tube can be accompanied by a

All of these
Waveguide match
Direct coax-helix match
Cavity match

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

π mode
π/4 mode
2π mode
π/2 mode

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Microwave Communication
What ferrite device can be used instead of duplexer of isolate microwave transmitter and receiver when both are connected to the same antenna?

Isolator
Simplex
Circulator
Magnetron

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

May be tested during the first five minutes of any hour
All of these
Must be capable of floating or being secured to a survival
Must have its battery replaced after emergency use

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