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OEM2-RO-circuite electronice(B)

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About this collection

The ANR bank contains many sets with original names and codes, including navigation, safety and equipment topics. Select a module by name or use question search.

“ANR — Electrotehnica-SEM_OEM2 — OEM2-RO-circuite electronice(B)” contains 3 questions across 1 collection.

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Sample questions and answers

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in practica, sunt tranzistoarele din amplificatoarele in contratimp clasa B au jonctiunea baza - emitor prepolarizata direct astfel ca prin fiecare tranzistor sa circule un mic curent de repaus. Despre aceste amplificatoare se spune ca lucreaza in clasa AB. Prin aceasta se urmareste:

One correct answer

  • marirea randamentului;
  • marirea amplificarii in putere
  • marirea benzii de trecere
  • reducerea distorsiunii de trecere✓ Correct answer
Ce caracteristica principala au invertoarele autonome de tensiune trifazate?

One correct answer

  • pot avea numai sarcina rezistiva
  • pot fi alimentate numai de la un transformator
  • sunt necomandate
  • blocarea tiristorului principal se realizeaza prin amorsarea unui alt tiristor principal✓ Correct answer
Un amplificator operational lucrand in bucla inchisa (cu reactie negativa) are amplificarea in tensiune intotdeauna:

One correct answer

  • unitara
  • subununitara
  • determinata de reteaua de reactie✓ Correct answer
  • foarte mare

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