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.

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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.

Third

Fifth

Sixth

Fourth

Third

Fifth

Sixth

Fourth

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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 gain

A reduction in horizontal resolution

A decrease in range

No noticeable effect

A decrease in gain

A reduction in horizontal resolution

A decrease in range

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Microwave Communication
The frequency of the oscillation generated by a magnetron, is mainly determined by

The flux density of the external magnet

The dimension of each cavity resonator

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

The ratio of the dc cathode voltage to the magnetic flux density

The number of the cavity resonators

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Microwave Communication
A traveling-wave tube (TWT) amplifies by virtue of

The energy liberated form the collector

The energy contained the cavity resonators

The effect of an external magnetic field

The absorption of energy by the signal from an electron stream

The energy liberated form the collector

The energy contained the cavity resonators

The effect of an external magnetic field

The absorption of energy by the signal from an electron stream

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The cavity resonator

Is equivalent to an LC resonant circuit

Produces a frequency which is independent of the cavity size.

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

Has a low Q factor for narrow operation.

Is equivalent to an LC resonant circuit

Produces a frequency which is independent of the cavity size.

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

Has a low Q factor for narrow operation.

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

π/2 mode

2π mode

π mode

π/4 mode

π/2 mode

2π mode

π mode

π/4 mode

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Microwave Communication

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

Microwave Communication The frequency of the oscillation generated by a magnetron, is mainly determined by

Microwave Communication A traveling-wave tube (TWT) amplifies by virtue of

Microwave Communication The cavity resonator

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

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

Microwave Communication
The frequency of the oscillation generated by a magnetron, is mainly determined by

Microwave Communication
A traveling-wave tube (TWT) amplifies by virtue of

Microwave Communication
The cavity resonator

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