MICROWAVE COMMUNICATION QUIZ

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

Loran B: 900 kHz

Loran D: 10.2 kHz

Loran C: 100 kHz

Loran A: 1950 kHz

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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 range

A decrease in gain

A reduction in horizontal resolution

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

Thyratron

Klystron

Reflex-klystron

Magnetron

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At what position is the input signal inserted into a traveling-wave tube?

At the collector

At the collector end of the helix

At the cathode end of the helix

At the control grid of the electron gun

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The antenna separations (in meters) required for optimum operation of a space diversity system can be calculated from:where R = effective earth radius (m) and L = path length (m)

S = λR/RL

S = 2λR/L

S = 3λR/L

S = λR/L

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In a pulsed radar set, the function of the duplexer is to

Allow the transmitter and the receiver to operate from a common antenna

Prevent frequency drift in the klystron

All of these

Aid in calibrating the display unit

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

Modulation

Propagation

Attenuation

Radiation

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The cavity resonator

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

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

The dimension of each cavity resonator

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

The flux density of the external magnet

The number of the cavity resonators

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