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Extra-Study/pages/E7B.md
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2025-05-01 15:49:18 -05:00

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E7B Amplifiers: class of operation; vacuum tube and solid-state circuits; distortion and intermodulation; spurious and parasitic suppression; switching-type amplifiers

  • E7B01 (A) For what portion of the signal cycle does each active element in a push-pull, Class AB amplifier conduct? #card
    • A. More than 180 degrees but less than 360 degrees
    • B. Exactly 180 degrees
    • C. The entire cycle
    • D. Less than 180 degrees
  • E7B02 (A) What is a Class D amplifier? #card
    • A. An amplifier that uses switching technology to achieve high efficiency
    • B. A low power amplifier that uses a differential amplifier for improved linearity
    • C. An amplifier that uses drift-mode FETs for high efficiency
    • D. An amplifier biased to be relatively free from distortion
  • E7B03 (A) What circuit is required at the output of an RF switching amplifier? #card
    • A. A filter to remove harmonic content
    • B. A high-pass filter to compensate for low gain at low frequencies
    • C. A matched load resistor to prevent damage by switching transients
    • D. A temperature compensating load resistor to improve linearity
  • E7B04 (A) What is the operating point of a Class A common emitter amplifier? #card
    • A. Approximately halfway between saturation and cutoff
    • B. Approximately halfway between the emitter voltage and the base voltage
    • C. At a point where the bias resistor equals the load resistor
    • D. At a point where the load line intersects the zero bias current curve
  • E7B05 (C) What can be done to prevent unwanted oscillations in an RF power amplifier? #card
    • A. Tune the stage for minimum loading
    • B. Tune both the input and output for maximum power
    • C. Install parasitic suppressors and/or neutralize the stage
    • D. Use a phase inverter in the output filter
  • E7B06 (B) What is a characteristic of a grounded-grid amplifier? #card
    • A. High power gain
    • B. Low input impedance
    • C. High electrostatic damage protection
    • D. Low bandwidth
  • E7B07 (D) Which of the following is the likely result of using a Class C amplifier to amplify a single-sideband phone signal? #card
    • A. Reduced intermodulation products
    • B. Increased overall intelligibility
    • C. Reduced third-order intermodulation
    • D. Signal distortion and excessive bandwidth
  • E7B08 (B) Why are switching amplifiers more efficient than linear amplifiers? #card
    • A. Switching amplifiers operate at higher voltages
    • B. The switching device is at saturation or cutoff most of the time
    • C. Linear amplifiers have high gain resulting in higher harmonic content
    • D. Switching amplifiers use push-pull circuits
  • E7B09 (D) What is characteristic of an emitter follower (or common collector) amplifier? #card
    • A. Low input impedance and phase inversion from input to output
    • B. Differential inputs and single output
    • C. Acts as an OR circuit if one input is grounded
    • D. Input and output signals in-phase
  • E7B10 (B) In Figure E7-1, what is the purpose of R1 and R2? #card image.png
    • A. Load resistors
    • B. Voltage divider bias
    • C. Self bias
    • D. Feedback

  • E7B11 (D) In Figure E7-1, what is the purpose of R3? #card image.png

    • A. Fixed bias
    • B. Emitter bypass
    • C. Output load resistor
    • D. Self bias
  • E7B12 (C) What type of amplifier circuit is shown in Figure E7-1? #card image.png
    • A. Common base
    • B. Common collector
    • C. Common emitter
    • D. Emitter follower