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Felicia Crăciunescu
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34 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
In cazul neglijarii anizotropiei rotorice (Xd=Xq=Xs) pentru modelarea generatorului sincron in regim permanent se utilizeaza:
O tensiune electro-motoare constanta in spatele reactantei tranzitorii
O tensiune electro-motoare constanta in spatele reactantei sincrone
O tensiune electro-motoare variabila in spatele reactantei sincrone
Answer explanation
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Puterea nodala este definita ca:
Diferenta dintre puterea consumata si puterea generata intr-un nod
Suma puterilor generate si consumate intr-un nod c. Diferenta dintre puterea generata si puterea consumat
Diferenta dintre puterea generata si puterea consumata intr-un nod
Answer explanation
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Legatura dintre marimea A= Are+ jAimg reprezinta in sistemul de coordonate (Re-Im) atasat retelei electrice si aceeasi marime reprezinta in sistemul de coordonate (d-q) atasat rotorului unui generator sincron exista relatia :
A=Ae^(-j(d-pi/2))
A=Ae^(j(d-pi/2))
A=Ae^(j(d+pi/2))
Answer explanation
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Estimarea starii statice a unui SEE prin metoda celor mai mici patrate ponderate este un proces de calcul:
Direct bazata pe metoda eliminarii Gauss pentru rezolvarea sistemului de ecuatii aferent modelului matemic
Iterativ bazat pe transpunerea matricei ponderii pentru calculul matricei de castig G
Iterativ bazat pe liniarizarea modelului matematic si calculul matricei de castig G
Answer explanation
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Daca in schemele echivalente ale liniilor si transformatoarelor electrice dintr-un SEE se neglijeaza rezistentele si admitantele transversale atunci pierderile de putere activa sunt:
Negative
Nule
Pozitive
Answer explanation
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
In cadrul procesului iterativ de calcul al regimului permanent un nod de tipul PU care a fost transformat in nod de tipul PQ cu : Qimp,i=Q imin
indiferent de valoarea lui Ui(p)
Ui(p)<Uimp, i
Ui(p)>Uimp, i
Answer explanation
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Cea mai buna estimare a starii statice prin metoda celor mai mici patrate ponderate se obtine daca:
matricea ponderilor este egala cu matricea de covarianta
matricea ponderilor este egala cu inversa matricei pe covarianta
matricea ponderilor este egala cu transpusa matricei de covarianta
Answer explanation
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