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Subelement A
RADAR Principles
Section 8
Components-2
The basic frequency determining element in a Gunn oscillator is:
  • The power supply voltage.
  • The type of semiconductor used.
  • Correct Answer
    The resonant cavity.
  • The loading of the oscillator by the mixer.
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Which of the following is not a method of analog-to-digital conversion?
  • Delta-sigma conversion.
  • Correct Answer
    Dynamic-range conversion.
  • Switched-capacitor conversion.
  • Dual-slope integration.
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When comparing TTL and CMOS logic families, which of the following is true:
  • CMOS logic requires a supply voltage of 5 volts ±20%, whereas TTL logic requires 5 volts ±5%.
  • Unused inputs should be tied high or low as necessary especially in the CMOS family.
  • Correct Answer
    At higher operating frequencies, CMOS circuits consume almost as much power as TTL circuits.
  • When a CMOS input is held low, it sources current into whatever it drives.
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The primary operating frequency of a reflex klystron is controlled by the:
  • Correct Answer
    Dimensions of the resonant cavity.
  • Level of voltage on the control grid.
  • Voltage applied to the cavity grids.
  • Voltage applied to the repeller plate.
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A Gunn diode oscillator takes advantage of what effect?
  • Negative resistance.
  • Avalanche transit time.
  • Bulk-effect.
  • Correct Answer
    Negative resistance and bulk-effect.
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Fine adjustments of a reflex klystron are accomplished by:
  • Adjusting the flexible wall of the cavity.
  • Correct Answer
    Varying the repeller voltage.
  • Adjusting the AFC control system.
  • Varying the cavity grid potential.
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