Refrigeration and Air-Conditioning - GATE practice papers - Mechanical

1)   Mass fraction of vapor in liquid-vapor mixture is called as _________(Marks: 02)
- Published on 19 Oct 15

a. partial gas fraction
b. flash gas fraction
c. both a. and b.
d. none of the above
Answer  Explanation 

ANSWER: flash gas fraction

Explanation:
Flash gas fraction is the quality of refrigerant at the inlet to the evaporator. This is the mass fraction of vapor in liquid-vapor mixture of refrigerant.


2)   Which parameter is constant during condensation process in vapor compression refrigeration cycle? (Marks: 02)
- Published on 19 Oct 15

a. enthalpy
b. volume
c. pressure
d. all of the above
Answer  Explanation 

ANSWER: pressure

Explanation:
Condensation process in vapor compression cycle is a constant pressure process. Refrigerant is first superheated and then condensed.


3)   What is the purpose of using capillary tube in vapor compression refrigeration cycle?(Marks: 01)
- Published on 19 Oct 15

a. to compress the refrigerant
b. to expand the refrigerant
c. to condense refrigerant
d. none of the above
Answer  Explanation 

ANSWER: to expand the refrigerant

Explanation:
High pressure condensed refrigerant is expanded in capillary tube or throttling value.


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