ME.IEB-EL

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ME.IEB-EL
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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 — Ro / ME + IEB / El.Bord / 8 — ME.IEB-EL” contains 14 questions across 1 collection.

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Din ce cauza la un transformator apare in exploatare o scurtcircuitare intre infasurarilor fazelor ?

One correct answer

imbunatatirea izolatiei principale datorata impregnarii cu lac de bachelita;
supratensiuni care au dus la strapungerea izolatiei;✓ Correct answer
imbatranirea lacului izolant al tolelor;

In ce consta functionarea "in gol" a transformatorului electric, conform cu figura alaturata ?

One correct answer

se aplica la bornele primarului A, X tensiunea alternativa U1 a retelei de alimentare, bornele infasurarii secundare nefiind legate la consumator;✓ Correct answer
t.e.m. E1, potrivit legii lui Lentz, se opune cauzei care a produs-o si deci va fi de sens contrar curentului aplicat de la retea, U1;
in infasurarea secundara se va induce un curent I2 = I20.

In ce consta functionarea "in gol" a transformatorului electric, conform cu figura alaturata ?

One correct answer

t.e.m. E1, potrivit legii lui Lentz, se opune cauzei care a produs-o si deci va fi de sens contrar curentului aplicat de la retea, U1;
in infasurarea secundara se va induce un curent I2 = I20.
fluxul magnetic alternativ Φ0 strabatand spirele infasurarilor primare si secundare induce in acestea tensiuni electromotoare proportionale cu numarul de spire, respectiv E1 si E2;✓ Correct answer

Ce se spune despre "miezul magnetic" ca parte componenta a transformatorului electric?

One correct answer

este elementul constructiv al transformatorului prin care se inchide fluxul magnetic principal;✓ Correct answer
formarea miezurilor se face separand coloanele de juguri sau utilizand otel masiv in loc de tole;
dupa forma constructiva a miezurilor magnetice, transformatoarele se impart in: transformatoare cu coloane in forma de "U" si transformatoare cu coloane in forma de "W";

Ce se spune despre "miezul magnetic" ca parte componenta a transformatorului electric?

One correct answer

formarea miezurilor se face imbinand coloanele din tole cu jugurile din otel masiv, prin simpla suprapunere;
dupa forma constructiva a miezurilor magnetice, transformatoarele se impart in: transformatoare cu coloane in forma de "U" si transformatoare cu coloane in forma de "W";
este alcatuit din tole de otel electromagnetic, izolate intre ele cu foita subtire de hartie sau o pelicula de lac izolant;✓ Correct answer

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