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RO-MA

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About this collection

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 — ME.IEB-OEMP — RO-MA” contains 10 questions across 1 collection.

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Sample questions and answers

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Alegeti plaja de valori in care se incadreaza alunecarea la motoarele asincrone trifazate navale la functionarea in regim de motor

Multiple correct answers

  • 00≤s≤1
  • 0✓ Correct answer
  • 0≤s<1✓ Correct answer
Care este Regim 1 in Fig. MA 03, care reprezinta caracteristica mecanica naturala a masinii asincrone

One correct answer

Question illustration
  • regim de generator✓ Correct answer
  • regim de motor
  • regim de frana
  • regim nominal
In cazul motoarelor asincrone trifazate cu rotor in scurt-circuit , infasurarea rotorica:

One correct answer

  • are un nr. de perechi de poli mai mare ca in infasurarea statorica
  • are un nr. de perechi de poli mai mic ca in infasurarea statorica
  • are un nr. de perechi de poli fie mai mare,fie mai mic ca in infasurarea statorica, in functie de varianta constructiva
  • ia automat acelasi nr. de perechi de poli ca infasurarea statorica✓ Correct answer
Principalele caracteristici la pornirea directa a motoarelor asincrone trifazate cu rotor in scurtcircuit sunt:

One correct answer

  • cuplu mare de pornire si curenti mici absorbiti de la retea
  • cuplu mic de pornire si curenti mari absorbiti de la retea
  • cuplu mic de pornire si curenti mici absorbiti de la retea
  • cuplu mare de pornire si curenti mari absorbiti de la retea✓ Correct answer
In cazul motoarelor asincrone trifazate cu rotor bobinat, valoarea cuplului maxim se poate obtine chiar si la pornire prin:

One correct answer

  • marirea frecventei tensiunii de alimentare
  • inserierea in circuitul statoric a unor rezistente exterioare
  • inserierea in circuitul rotoric a unor rezistente exterioare suficiente ca valoare pentru ca alunecarea critica sa atinga valoarea maxima✓ Correct answer
  • alimentarea directa la retea a motorului fara inserierea de rezistente exterioare la infasurari.

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