The type of compressor used in refrigeration system is
A.Reciprocating
B.Centrifugal
C.Rotary sliding vane
D.Rotary screw compressor
E.All of the above
Category: Refrigeration and Air conditioning Mcqs
The condition of refrigerant before and after compression in vapour compression cycle is
A.Wet vapour, cry saturated vapour
B.Liquid, wet vapour
C.Dry saturated vapour, superheated vapour
D.Dry saturated vapour, liquid
E.Wet vapour, wet vapour
The freezing point of ammonia is
A.0?C
B.? 20?C
C.? 77.8?C
D.? 132.5?C
E.? 202.5?C
Moisture in Freon refrigeration system causes
A.Ineffective refrigeration
B.Damage to compressor
C.High power consumption
D.Freezing of automatic regulating valve
E.None of the above
Hydrogen cannot be liquefied at room temperature by the application of pressure, because
A.It has low density
B.It has high viscosity
C.Its thermal conductivity is high
D.It is a diatomic molecule
E.Its critical temperature is lower than the normal room temperature
Out of the following refrigerants which one will provide highest compressor displacement per tonne of refrigeration in a vapour compression system operating between fixed temperatures
A.Ammonia
B.Freon 11
C.Freon 12
D.Freon 22
E.Carbondioxide
Dry bulb temperature depends on
A.Humidity of air
B.Water vapour content of air
C.Condition of air
D.All above
E.None of the above
The ratio of sensible heat to total heat is known as
A.Dew point
B.Humidification ratio
C.Relative humidity
D.Specific humidity
E.Sensible heat factor
An average adult while sitting in a cinema hall
A.Absorbs about 100 kcal of heat per hour
B.Absorbs about 500 kcal of heat per hour
C.Discards about 500 kcal of heat per hour
D.Discharges about 100 kcal of heat per hour
E.Neither absorbs nor discards heat
