Top 250+ Solved Refrigeration and Air conditioning MCQ Questions Answer
Q. In a refrigeration cycle the heat is rejected by refrigerant at
a. expansion valve
b. compressor
c. condenser
d. all the above
Q. A reversible refrigerator working between two fixed temperatures
a. has the same COP whatever the working substance
b. has its COP increased for working substance with high enthalpy of evaporation
c. has its COP increased for working substance with higher specific heats
d. none of above
Q. The air craft system giving Lowest Dry Air Rated Turbine discharge temperature atsupersonic cruising speeds of the plane, is
a. Reduced ambient system of Refrigeration
b. Boot-strap system of Refrigeration
c. Regenerative system of Refrigeration
d. Boot strap evaporative system of Refrigeration
Q. A reversible refrigerator working between two fixed temperatures
a. has the same COP whatever the working substance
b. has its COP increased for working substance with high enthalpy of evaporation
c. has its COP increased for working substance with higher specific heats
d. none of the above
Q. Heat is absorbed by the refrigerant, during vapour compression refrigeration cycle in
a. Compressor
b. Condenser
c. Evaporator
d. Throttle valve
Q. In a simple saturated vapour compression cycle, the refrigerant is in superheated condition
a. before entering compressor
b. before entering condenser
c. before entering throttle valve
d. before entering evaporator
Q. Sub-cooling is a process of cooling the refrigerant in vapour compression refrigeration system
a. after compression
b. before compression
c. before Throttling
d. none of the above
Q. The order in which main components of vapour compression refrigeration system are used is
a. compressor-evaporator-condenser-throttle valve
b. compressor-condenser-evaporator-throttle valve
c. compressor-throttle valve- evaporator-condenser
d. compressor-condenser- throttle valve- evaporator
Q. The oil separator is incorporated in vapour compression refrigeration system
a. between evaporator and compressor
b. between compressor and condenser
c. between condenser and Throttle valve
d. between throttle valve and evaporator
Q. In vapour compression refrigeration cycle the following data is available Heat rejected in condenser = 65 KW Work done in compressor = 10 kw, then COP( refrigerator) is
a. 4.5
b. 5.5
c. 6.5
d. not possible to find with the given data
Q. With reciprocating compressor in vapour compression refrigeration system, wetcompression is not desirable because
a. liquid trapped up in the head of cylinder may damage the compressor valves
b. COP of the cycle decreases
c. volumetric efficiency of compressor decreases
d. mass flow rate per ton of refrigerant increases
Q. An ideal refrigerant should have
a. low latent heat of vaporization
b. high critical temperature
c. high boiling point
d. high specific volume of vapour