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Subel. C
6 questions
Subelement C
Components
Section 19
Photoconductive Devices
What happens to the conductivity of photoconductive material when light shines on it?
  • Correct Answer
    It increases.
  • It decreases.
  • It stays the same.
  • It becomes temperature dependent.
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What is the photoconductive effect?
  • The conversion of photon energy to electromotive energy.
  • Correct Answer
    The increased conductivity of an illuminated semiconductor junction.
  • The conversion of electromotive energy to photon energy.
  • The decreased conductivity of an illuminated semiconductor junction.
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What does the photoconductive effect in crystalline solids produce a noticeable change in?
  • The capacitance of the solid.
  • The inductance of the solid.
  • The specific gravity of the solid.
  • Correct Answer
    The resistance of the solid.
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What is the description of an optoisolator?
  • Correct Answer
    An LED and a photosensitive device.
  • A P-N junction that develops an excess positive charge when exposed to light.
  • An LED and a capacitor.
  • An LED and a lithium battery cell.
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What happens to the conductivity of a photosensitive semiconductor junction when it is illuminated?
  • The junction resistance is unchanged.
  • Correct Answer
    The junction resistance decreases.
  • The junction resistance becomes temperature dependent.
  • The junction resistance increases

Standard semiconductors use voltage at the base to control the conductivity of the junction a photosensitive semiconductor uses light instead.

As the light increases the junction resistance decreases therefore increasing the conductivity.

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What is the description of an optocoupler?
  • A resistor and a capacitor.
  • Two light sources modulated onto a mirrored surface.
  • Correct Answer
    An LED and a photosensitive device.
  • An amplitude modulated beam encoder.
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