- A. The mode of operation
- B. Its electrical dimensions
- C. Its physical dimensions
- D. The capacitor which tunes it
Microwave Communication
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The resonant frequency of a cavity resonator depends upon_____.
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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_____.
- A. 10,000 watts
- B. 100 watts
- C. 1,000 watts
- D. 1,000,000 watts
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______ is the progressive decrease of signal strength with increasing distance.
- A. Radiation
- B. Attenuation
- C. Modulation
- D. Propagation
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Coupling into and out of a traveling-wave tube can be accompanied by a_____.
- A. Waveguide match
- B. Cavity match
- C. Direct coax-helix match
- D. All of the above
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Which of the following operating frequencies is used for the modern loran navigational system?
- A. Loran C: 100 kHz
- B. Loran D: 10.2 kHz
- C. Loran A: 1950 kHz
- D. Loran B: 900 kHz
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What is the purpose of the electromagnetic field which surrounds a traveling-wave tube?
- A. To accelerate the electron
- B. To velocity modulate the electron beam
- C. To keep the electrons from spreading out
- D. To slow down the signal on the helix
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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_____.
- A. π mode
- B. π/2 mode
- C. 2π mode
- D. π/4 mode
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A traveling-wave tube (TWT) amplifies by virtue of_____.
- A. The absorption of energy by the signal from an electron stream
- B. The effect of an external magnetic field
- C. The energy contained the cavity resonators
- D. The energy liberated form the collector
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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_____.
- A. Must remain as before
- B. Must be increased
- C. May be decreased
- D. Must be doubled
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Klystron oscillators are most often used in the frequency range of_____.
- A. 300 to 3000 MHz
- B. 3000 to 30000 MHz
- C. 30 to 30000 MHz
- D. 10 to 10000 MHz