Air for air conditioning of aircraft cabin is obtained by
A.Compressing ambient air
B.Recycling cabin air
C.Dehumidifying cabin air
D.Bleeding from air compressor
E.Turbine exhaust
Category: Refrigeration and Air conditioning Mcqs
PVC tubes are used for condenser and evaporator when the refrigerant is
A.Freon 12
B.Freon 22
C.Ammonia
D.Sulphur dioxide
E.None of the above
When the air temperature reaches the point where relative humidity is 100% the air is saturated because it cannot hold any more moisture. This temperature is called
A.Freezing point
B.Partial freezing point
C.Dew point
D.Dew point of water vapour
E.Dew point of air
Refrigerant 744 is
A.Air
B.Ammonia
C.Carbondioxide
D.Freon 12
E.Freon 22
If wet bulb temperature is same as dew point, the relative humidity of air will be
A.0
B.25
C.50
D.67
E.100
If space occupied by the refrigerating plant and cost is the major consideration, which of the following refrigerant will be preferred?
A.Carbondioxide
B.Sulphur dioxide
C.Mehtyl chloride
D.Ammonia
E.Any of the above
In a ammonia vapour compression cycle during gas charging the connection is made
A.Anywhere in the cycle
B.At the compressor cycle
C.At the compressor outlet
D.On low pressure side near evaporat
E.On high pressure side close to receiver
Dehumidification means
A.Removing humidity from a space
B.Reducing the quantity of water vapour in a space
C.Reducing the moisture content of a substance
D.Any of the above
E.None of the above
The change in temperature resulting from a gas expanding from one constant pressure, with no heat transfer and no external work other than to maintain the constant pressure is known as
A.Dalton’s law of partial pressures
B.Law of conservation of energy
C.Kinetic theory of gases
D.Avogadro’s hypothesis
E.Joule – Thomoson effect
