The condition of refrigerant before and after the condenser in a vapour compression cycle is
A.Dry saturated, saturated liquid
B.Dry saturated, wet vapour
C.Dry saturated, dry saturated
D.Wet vapour, wet vapour
E.Liquid, liquid
Category: Refrigeration and Air conditioning Mcqs
Defrosting of evaporators is done because
A.Frosting is undersirable
B.Frosting increases refrigerating effect
C.Frosting retards heat flow
D.Frosting obstructs flow of refrigerant
E.Frosting may cause damage to equipment
The bulk of tubes at the back of the domestic refrigerator are
A.Condenser tubes
B.Evaporator tubes
C.Refrigerant cooling tubes
D.Capillary tubes
E.Throttling device
Refrigerant R-40 is
A.Air
B.Methyl chloride
C.Glycol
D.Brine
E.None of the above
Which of the following symptoms will indicate under charging of a vapour compressor refrigeration cycle?
A.Compressor runs continuously
B.Frost on suction line
C.Low suction pressure
D.Low head pressure
E.All of the above
In control cooling water system, chromates, phosphates and silicates are added to water
A.To prevent scale formation
B.To remove odour
C.To increase remove foreign particle
D.To inhibit corrosion
E.To prevent algae growth
If a discharge pressure of a refrigeration compressor is too high, it shows there is (are)
A.Too little or too warm condenser water
B.Fouled tubes in shell and tube condenser
C.Improper operations of evaporator condenser
D.Overcharge of refrigerant
E.Any of the above
For for measurement of temperature in cryogenic range the thermometers used are
A.Pyrometers
B.Radiation pyrometers
C.Mercury thermometers
D.Gas thermometers
E.Electronic digital instruments
A prssure gauge on the discharge side of compressor
A.Indicates the temperature of refrigerant after compression
B.Gives an ideas about the coefficient of performance of the cycle
C.Gives a warning when the pressure reaches a dangerous point
D.Confirms the flow of refrigerant in cycle
E.Is mounted for show only
The performance of an evaporative condenser largely depends on
A.Dry bulb temperature
B.Wet bulb temperature
C.Hot water temperature
D.Ambient temperature
E.Air conditioned room temperature
