Refrigeration And Air Conditioning - Study Mode
[#186] A refrigerant compressor is used to
Correct Answer
(D) All of the above
Explanation
Solution: A refrigerant compressor is used to: - Raise the pressure of the refrigerant - Raise the temperature of the refrigerant - Circulate the refrigerant through the refrigerating system
[#187] A reversible engine has ideal thermal efficiency of 30%. When it is used as a refrigerating machine with all other conditions unchanged, the coefficient of performance will be
Correct Answer
(B) 2.33
Explanation
Solution: C.O.P. is reciprocal of efficiency of heat engine. C.O.P. = $$frac{1}{{0.3}}$$ = 3.33 = C.O.P. of heat engine. Now, C.O.P. of refrigerator = C.O.P. of heat engine - 1 = 3.33 - 1 = 2.33.
[#188] In a domestic refrigerator, a capillary tube controls the flow of refrigerant from the
Correct Answer
(A) Expansion valve to the evaporator
Explanation
Solution: In a domestic refrigerator, a capillary tube controls the flow of refrigerant from the Expansion valve to the evaporator
[#189] A vapour absorption refrigeration system
Correct Answer
(B) Gives quiet operation
Explanation
Solution: A vapour absorption refrigeration system Gives quiet operation
[#190] A refrigeration system
Correct Answer
(A) Removes heat from a low temperature body and delivers it to a high temperature body
Explanation
Solution: Refrigeration is the process of cooling a space, substance, or system to lower and/or maintain its temperature below the ambient one (while the removed heat is rejected at a higher temperature). In other words, refrigeration means artificial (human-made) cooling.