A refrigerant cycle is usually a
A.Open cycle
B.Closed cycle
C.Mixed cycle
D.Hybrid cycle
Category: Refrigeration and Air conditioning Mcqs
If a refrigerator is directly exposed to sun rays
A.It will stop working
B.The refrigerant will leak
C.There will be less cooling effect
D.Frost will be formed on cabinet surface
E.(A) and (B) above
White ice is
A.Sub-cooled water
B.Fast cooled water
C.Due to dissolved air, gases and impurities
D.Produced by blowing air during freezing
E.None of the above
When the higher temperature is fixed, the COP of a refrigerating machine can be improved by
A.Operating the machine at higher speeds
B.Operating the machine at lower speeds
C.Raising the higher temperature
D.Lowering the higher temperature
E.None of the above
When Freon 12 is used as a refrigerant in vapour compression cycle, the mass circulated per ton of refrigerating effect will be nearly
A.0.2 kg
B.0.5 kg
C.1 kg
D.12 kg
E.1.8 kg
In a refrigeration system, if the compressor short cycles, the probable cause could be
A.Intermittent contact in electric control circuit
B.Dirty or iced evaporator
C.Lack of refrigerant
D.Overchange of refrigerant
E.Any of the above
In rainy season desert coolers become ineffective
A.Because of low temperature
B.Pleasant weather
C.Rain serves the purpose of cooler
D.Humidity of air increases
E.None of the above
Air and other non-condensable gases (foul gases) get into a refrigeration system through
A.Decomposition of refrigerant in contact with impurities
B.Breakdown of oil
C.Under vacuum operation or during maintenance work
D.Corrosion
E.Any of the above
Which reciprocating compressor is usually used in domestic refrigerators?
A.Open type
B.Semi-sealed type
C.Hermetically sealed type
D.Any of the above
E.None of the above
