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OEM2-EN-dispozitive semiconductoare(A)

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“ANR — Electrotehnica-SEM_OEM2 — OEM2-EN-dispozitive semiconductoare(A)” contains 20 questions across 1 collection.

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Sample questions and answers

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The main application for SCRs and triacs is:

One correct answer

  • as audio amplifiers.
  • as oscillators.
  • for control of current in the milliampere range.
  • for control of power in the watt or kilowatt range.✓ Correct answer
Breakover voltage of a diac is:

One correct answer

  • never to be exceeded.
  • the point at which its resistance changes from high to low.✓ Correct answer
  • the same as avalanche voltage.
  • always less than 0.6 V.
SCR phase-shift control circuits are used to vary the ____ between the trigger pulse and the point in the conducting cycle when the pulse occurs.

One correct answer

  • power delivered
  • time relationship✓ Correct answer
  • different points
  • motor speed
A silicon-controlled rectifier (SCR) is normally biased so that it can be turned ON by:

One correct answer

  • momentarily increasing its forward voltage.
  • increasing its reverse voltage.
  • momentarily applying a gate current.✓ Correct answer
  • momentarily decreasing its gate current.
The laser diode has a(n) ____ which is required for lasing production.

One correct answer

  • optical cavity✓ Correct answer
  • depletion area
  • hole current carriers
  • electron current carriers

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