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OEM2-RO-dispozitive semiconductoare (B)

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“ANR — Electrotehnica-SEM_OEM2 — OEM2-RO-dispozitive semiconductoare (B)” contains 4 questions across 1 collection.

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Consideram o dioda cu germaniu si o dioda cu siliciu avand aceleasi limite de curent. Comparand cele doua diode in ceea ce priveste caderea de tensiune corespunzatoare unui anumit curent in regim de conductie directa si curentul rezidual in regim de conductie inversa, se poate face urmatoarea afirmatie:

One correct answer

  • caderea de tensiune in conductie directa si curentul invers sunt mai mici la dioda cu siliciu
  • caderea de tensiune in conductie directa este mai mica iar curentul invers este mai mare la dioda cu siliciu
  • caderea de tensiune in conductie directa si curentul invers sunt mai mari la dioda cu siliciu
  • caderea de tensiune in conductie directa este mai mare iar curentul invers este mai mic la dioda cu siliciu✓ Correct answer
Care sunt conditiile corecte de polarizare pentru un tranzistor npn folosit ca simplu amplificator?

One correct answer

  • baza negativa fata de emitor, colectorul negativ fata de baza
  • baza pozitiva fata de emitor, colectorul pozitiv fata de baza✓ Correct answer
  • baza negativa fata de emitor, colectorul pozitiv fata de baza
  • baza pozitiva fata de emitor, colectorul negativ fata de baza
Cum trebuie sa fie polarizate cele doua jonctiuni ale unui tranzistor care functioneaza in regiunea activa normala?

One correct answer

  • jonctiunea emitor-baza polarizata direct, jonctiunea colector-baza polarizata invers✓ Correct answer
  • jonctiunea emitor-baza polarizata invers, jonctiunea colector-baza polarizata direct
  • ambele jonctiuni polarizate invers
  • ambele jonctiuni polarizate direct
Cum variaza vBE cu cresterea temperaturii (in domeniul normal de variatie a temperaturii ambiante)?

One correct answer

  • aproximativ - 20 mV/oC
  • aproximativ - 2 mV/oC✓ Correct answer
  • aproximativ - 200 V/oC
  • aproximativ - 20 V/oC

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