Schimbatoarele de caldura recuperative:

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Hard
Diana Iacob
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86 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
pot fi de suprafata sau de contact direct
pot fi de suprafata sau de contact direct
realizeaza coeficinti de transfer de caldura mai mari decat in cazul celor regenerative
2.
MULTIPLE SELECT QUESTION
45 sec • 1 pt
Schimbatoarele de caldura tubulare prin marirea nr de treceri:
coeficientul de conv in exteriorul tevilor se va micsora
apartul devine mai scurt
pierderile de presiune la curgerea prin tevi se maresc
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Într-un schimbator de caldura coeficientul global de schimb de caldura:
este mai mare decat cel mai mic coeficient de convectie
este mai mic decat cel mai mic coeficient de conv
este cuprins intre cele doua valori ale coef de conv
4.
MULTIPLE SELECT QUESTION
45 sec • 1 pt
În cazul curgerii in curent incrucisat pt aceleasi temperaturi ale agentilor termici, diferenta medie de temperatura:
este mai mare decat in cazul echicurentului
este mai mare decat in cazul contracurentului
este diferita daca fluidele sunt amestecate sau neamestecate
5.
MULTIPLE SELECT QUESTION
45 sec • 1 pt
Schimb de caldura cu placi si garnituri:
nu se pot utilize la temperature mai mari de 180grdC
pot fi demontate
au NTC mai mare decat schimb tubulare
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In cazul schimb de cald regenerative:
fluxul termic prin suprafata isi schimba sensul periodic
furnizarea ag sec este intotdeauna intemitenta
realizeaza coef de transf de cald mai mari decat in cazul aparatelor recuperative
7.
MULTIPLE SELECT QUESTION
45 sec • 1 pt
Unghiul de ondulare al placilor unui schimbator de caldura:
influenteaza pierderile de caldura in apara
influenteaza coeficientul de schimb de caldura
mareste nr lui Re
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