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Subelement 4

Circuit Components

Section 4-05

triode vacuum tube fundamentals

What is one reason a triode vacuum tube might be used instead of a transistor in a circuit?

  • It uses less current
  • Correct Answer
    It may be able to handle higher power
  • It is much smaller
  • It uses lower voltages
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Which component can amplify a small signal but must use high voltages?

  • Correct Answer
    A vacuum tube
  • A transistor
  • An electrolytic capacitor
  • A multiple-cell battery
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A feature common to tubes and transistors is that both:

  • have electrons drifting through a vacuum
  • Correct Answer
    can amplify signals
  • convert electrical energy to radio waves
  • use heat to cause electron movement
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In a vacuum tube, the electrode that is operated with the highest positive potential is the _______.

  • filament (heater)
  • Correct Answer
    plate
  • cathode
  • grid
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In a vacuum tube, the electrode that is usually a cylinder of wire mesh is the _______.

  • filament (heater)
  • Correct Answer
    grid
  • cathode
  • plate
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In a vacuum tube, the element that is furthest away from the plate is the _______.

  • grid
  • emitter
  • cathode
  • Correct Answer
    filament (heater)
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In a vacuum tube, the electrode that emits electrons is the _______.

  • Correct Answer
    cathode
  • grid
  • collector
  • plate
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What is inside the envelope of a triode tube?

  • argon
  • Correct Answer
    a vacuum
  • air
  • neon
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How many grids are there in a triode vacuum tube?

  • two
  • three
  • three plus a filament
  • Correct Answer
    one
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If you do not wish to have current flowing in the grid circuit of a vacuum tube, the grid should be:

  • positive with respect to the anode
  • Correct Answer
    negative with respect to the cathode
  • positive with respect to both cathode and anode
  • positive with respect to the cathode
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The negative DC control voltage applied to the control grid of a vacuum tube is called:

  • suppression voltage
  • Correct Answer
    bias voltage
  • repulsion voltage
  • excitation voltage
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