Top 250+ Solved Refrigeration and Air conditioning MCQ Questions Answer
Q. The refrigerant leaving throttle valve is
a. saturated liquid
b. saturated vapour
c. superheated vapour
d. fraction as saturated vapour and remainder as liquid
Q. Freon group of refrigerants
a. toxic
b. inflammable
c. non-toxic and non-inflammable
d. highly toxic and inflammable
Q. The leaks of refrigerant from a cycle may be detected by
a. halide torch test
b. sulphur candle test
c. soap and water test
d. any of the above
Q. During compression in a vapour compression cycle the refrigerant is super heated
a. work done is increased
b. C.O.P is increased
c. Work done is reduced
d. Refrigerating effect is reduced
Q. Heat is rejected by the refrigerant, during vapour compression refrigeration cycle in
a. Compressor
b. Condenser
c. Evaporator
d. Throttle valve
Q. Wet compression vapour compression refrigeration cycle means
a. Vapour compression takes place in wet region
b. Vapour compression in dry region, but evaporation in wet region
c. vapour compression in wet region, but leaves in superheated region
d. None of the above
Q. With reciprocating compressor in vapour compression refrigeration system, wet compression 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. lower critical temperature
c. lower boiling point
d. high specific volume of vapour
Q. During compression in a vapour compression cycle the refrigerant is super heated
a. C.O.P is reduced
b. C.O.P is increased
c. Work done is reduced
d. Refrigerating effect is reduced
Q. Heat is absorbed by a refrigerant, during a refrigeration cycle in a
a. condenser
b. evaporator
c. compressor
d. throttle valve
Q. What is the effect of frost on the cooling coils of the evaporator of refrigeration system
a. It reduces the life of cooling coils
b. It increases the compressor pressure
c. It makes the compressor run for comparatively short runs
d. It acts as the insulator and decreases the heat transfer rate
Q. The widely used refrigerant in domestic refrigerators is
a. Carbon-dioxide
b. Sulphur dioxide
c. Freon-12
d. Ammonia
Q. Freon group refrigerants are
a. toxic
b. inflamma
c. nontoxic and inflammable
d. non- toxic & non-inflammable
Q. Latent heat of vaporization of a refrigerant ,at lower temperatures and pressures
a. increase
b. decreases
c. remains constant
d. unpredictable