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Subel. A
6 questions
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.

In a signal, dynamic range is the ratio of the power of the strongest signal to the power of the weakest signal.

Dynamic-range conversion refers to decreasing (compression) or increasing (expansion) the dynamic range of a signal.

Dynamic range and dynamic range conversion are therefore unrelated to ADC - Analog to Digital Conversion and the right Answer is B.

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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.

They are the same at Higher Frequencies, so don’t compare Families, it’s not nice.

Last edited by jukesj01. Register to edit

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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.

Fine adjustments of a reflex klystron are accomplished by:

Varying the repeller voltage.

A reflex klystron is a type of microwave tube used to generate microwave signals at a specific frequency. Fine adjustments of a reflex klystron are accomplished by varying the repeller voltage.

The repeller voltage is used to control the velocity of the electrons passing through the cavity of the reflex klystron. By adjusting the repeller voltage, the electron beam's velocity can be finely tuned, which affects the phase relationship between the electrons and the RF signal in the cavity. This, in turn, allows for precise frequency control and fine adjustments of the generated microwave signal.

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