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09_MAI

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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 — RO-DIN — 09_MAI” contains 2 questions across 1 collection.

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Sample questions and answers

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In determinarea ordinei de aprindere la motoarele in patru timpi cu numar par de cilindri si plan central de simetrie apare multiplicarea posibilitatilor de aprindere, deoarece:

One correct answer

  • Ciclul motor este efectuat in 720 grd RAC;
  • Numarul de cilindri este par;
  • Exista perechi de manivele in faza doua cate doua fata de mijlocul arborelui cotit (planul central de simetrie);
  • Existenta grupelor de manivele in faza face ca in timpul primei rotatii acestea sa ajunga la punctul mort interior, pentru fiecare fiind posibile cate doua variante de ordine de aprindere.✓ Correct answer
Miscarea reala a arborerelui cotit nu este uniforma, deoarece:

One correct answer

  • Forta de presiune a gazelor este insuficienta pentru a compensa pe cele de inertie;
  • Miscarea pistoanelor in cilindrii motorului este alternative si variatia presiunii in acestia este mare, ceea ce genereaza fluctuatii importante ale momentului motor;
  • Fluctuatiile momentului motor intre valorile extreme implica variatii ale energiei cinetice ale maselor in miscare, deci a vitezei unghiulare a arborelui cotit;
  • Raspunsurile b) si c) sunt complementare.✓ Correct answer

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