OEM3-RO-DISPOZITIVE

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OEM3-RO-DISPOZITIVE
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“ANR — Electrotehnica-OEM3 — OEM3-RO-DISPOZITIVE” contains 6 questions across 1 collection.

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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

In conditii normale, o dioda stabilizatoare functioneaza

One correct answer

in regim de polarizare directa
in regim de polarizare inversa la tensiunea de strapungere V(BR)✓ Correct answer
in regim de polarizare inversa, la o tensiune mai mica decat V(BR);
in regim de polarizare inversa, la o tensiune mai mare decat V(BR);

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

Tranzitia din starea de blocare in starea de conductie (amorsarea sau aprinderea) unui tiristor se face prin

One correct answer

numai comanda de pe poarta
comanda de pe poarta si polarizarea directa a structurii (plus pe anod minus pe catod).✓ Correct answer
numai polarizarea directa a structurii (plus pe anod minus pe catod).
comanda de pe poarta si polarizarea inversa a structurii (minus pe anod pe plus catod)

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