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Grile 3.2 Modul 1 Electromec Constantinescu FMC&FMM

A detailed illustration of a synchronous motor with electromagnetic fields highlighted, including labels for torque, load angle, and various components in a technical style.

Electromechanical Concepts Quiz

Test your knowledge on electromechanical principles with our comprehensive quiz focused on synchronous machines. This quiz consists of 10 multiple choice questions designed to challenge your understanding of the electromagnetic aspects of electric motors and generators.

Learn about electromagnetic torque expressions
Explore the characteristics of synchronous machines
Understand load angle and its implications on machine performance

10 Questions2 MinutesCreated by ElectricWave302

22) Expresia cuplului electromagnetic a unei motor sincron trifazat cu poli aparenti este de forma:

21) Expresia cuplului electromagnetic a unei masini sincrone trifazate cu poli plini este de forma:

23) Curbele in V ale generatorului sincron reprezinta dependenta:

A) I=f(l indiceE) ,pentru U=ct.,P=ct.;

B) U=f(I),pentru cosφ=ct., IE=ct

C) UE=f(IE), pentru U=ct.,f=ct.,cos φ=ct;

D) U=f(UindiceE),pentru IE=ct.,I=ct.

24) Reactia indusului generatorului sincron avand ca sarcina o bobina ideala are caracter :

A ) longitudinal magnetizata

B ) transversal;

C ) longitudinal demagnetizata;

D ) mixt;

25) Reactia indusului generatorului sincron avand ca sarcina un condensator ideal are caracter :

A ) longitudinal magnetizata;

B ) longitudinal demagnetizata;

C ) mixt;

D ) transversal;

26) Unghiul de sarcina Θ al masinii sincrone reprezinta:

A ) unghiul de defazaj dintre t.e.m. polara URE ,indusa de catre campul inductor si curentul de sarcina I;

B ) unghiul dintre tensiunea la borne si componenta activa Id a curentului de sarcina I;

C ) unghiul dintre tensiunea la borne si componenta reactiva Id a curentului de sarcina I;

D ) unghiul dintre tensiunea la borne si curentul de sarcina;

27) Viteza de rotatie (n) a motorului sincron trifazat alimentat de la o retea de frecventa constanta:

A ) depinde liniar de sarcina;

B ) depinde patratic de sarcina;

C ) depinde sinusoidal de sarcina;

D ) nu depinde de sarcina.

28) La masinile sincrone in mod normal unghiul de sarcina nominal este:

A) 0 grade

B) 25 grade

C) 90 grade

D) 180 grade

29) Modificarea vitezei de rotatie a motoarelor sincrone se face de regula prin:

A ) variatia frecventei tensiunii de alimentare;

B ) prin modificarea valorii efective a tensiunii de alimentare;

C ) prin schimbarea numarului de poli;

D ) prin introducerea unor rezistente in circuitul rotoric.

30) Incarcarea cu putere activa a unui generator sincron se face prin:

A ) modificarea tensiunii de la borne;

B ) cresterea cuplului la arbore

C ) modificarea curentului de excitatie;

D ) modificarea frecventei tensiunii la borne;

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