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Microwave Communication
What is the purpose of the electromagnetic field which surrounds a traveling-wave tube?
To slow down the signal on the helix
To accelerate the electron
To keep the electrons from spreading out
To velocity modulate the electron beam
To slow down the signal on the helix
To accelerate the electron
To keep the electrons from spreading out
To velocity modulate the electron beam
Answer
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Related Question
Microwave Communication
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 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
The flux density of the external magnet
Answer
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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
Must be doubled
May be decreased
Must remain as before
Must be increased
Must be doubled
May be decreased
Must remain as before
Must be increased
Answer
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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
100 watts
1,000,000 watts
1,000 watts
10,000 watts
100 watts
1,000,000 watts
1,000 watts
10,000 watts
Answer
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Microwave Communication
Which of the reception problems below that is not due to multipath?
Delayed spreading
Slow fading
Rayleigh fading
Random Doppler shift
Delayed spreading
Slow fading
Rayleigh fading
Random Doppler shift
Answer
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Microwave Communication
A PPI cathode-ray tube as used on a radar set
Indicates both the range and azimuth of a target
Indicates only the range of a target
Is used for receiver alignment
Is used to check the percentage of modulation
Indicates both the range and azimuth of a target
Indicates only the range of a target
Is used for receiver alignment
Is used to check the percentage of modulation
Answer
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