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  • Question
  • When measuring the characteristics of a small-signal amplifier, say for a radio receiver, one might be concerned with its "Noise..."?


  • Options
  • A. Fundamental
  • B. Fall
  • C. Force
  • D. Figure

  • Correct Answer
  • Figure 

    Explanation
    "Noise figure" is one critical parameter for determining the "quality" of a low-noise, small-signal, amplifier, and perhaps more importantly, the sensitivity of the overall receiver system. It is especially important for VHF (very high frequency) - and higher frequency - designs where most of the undesired "noise" (noise that masks or overpowers the desired signals) is generated internal to the electronics itself. In HF (high frequency) applications, atmospheric noise plays a much larger role in determining overall useful sensitivity, so a circuit's "noise figure" is less important.

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    • 1. What is part of a database that holds only one type of information?

    • Options
    • A. Report
    • B. Field
    • C. Record
    • D. File
    • Discuss
    • 2. What does AM mean?

    • Options
    • A. Angelo marconi
    • B. Anno median
    • C. Amplitude modulation
    • D. Amperes
    • Discuss
    • 3. Who co-created the UNIX operating system in 1969 with Dennis Ritchie?

    • Options
    • A. Bjarne Stroustrup
    • B. Steve Wozniak
    • C. Ken Thompson
    • D. Niklaus Wirth
    • Discuss
    • 4. Sometimes computers and cache registers in a foodmart are connected to a UPS system. What does UPS mean?

    • Options
    • A. United Parcel Service
    • B. Uniform Product Support
    • C. Under Paneling Storage
    • D. Uninterruptable Power Supply
    • Discuss
    • 5. Compact discs, (according to the original CD specifications) hold how many minutes of music?

    • Options
    • A. 74 mins
    • B. 56 mins
    • C. 60 mins
    • D. 90 mins
    • Discuss
    • 6. The transformer that develops the high voltage in a home television is commonly called a...?

    • Options
    • A. Tesla coil
    • B. Flyback
    • C. Yoke
    • D. Van de Graaf
    • Discuss
    • 7. What does EPROM stand for?

    • Options
    • A. Electric Programmable Read Only Memory
    • B. Erasable Programmable Read Only Memory
    • C. Evaluable Philotic Random Optic Memory
    • D. Every Person Requires One Mind
    • Discuss
    • 8. Which motor is NOT suitable for use as a DC machine?

    • Options
    • A. Permanent magnet motor
    • B. Series motor
    • C. Squirrel cage motor
    • D. Synchronous motor
    • Discuss
    • 9. The sampling rate, (how many samples per second are stored) for a CD is...?

    • Options
    • A. 48.4 kHz
    • B. 22,050 Hz
    • C. 44.1 kHz
    • D. 48 kHz
    • Discuss
    • 10. What does the term PLC stand for?

    • Options
    • A. Programmable Lift Computer
    • B. Program List Control
    • C. Programmable Logic Controller
    • D. Piezo Lamp Connector
    • Discuss


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