If dry bulb temperature is 25?C and wet bulb temperature is 18?C, then which of the following temperatures could possibly represent dew point?
A.14?C
B.18?C
C.25?C
D.40?C
E.43?C
Category: Refrigeration and Air conditioning Mcqs
The secondary refrigerant used in milk chilling plants is usually
A.Brine
B.Ammonia solution
C.Glycol
D.Sodium silicate
E.Any of the above
The flow of the refrigerant in a refrigeration cycle is controlled by
A.Compressor
B.Condenser
C.Evaporator
D.Expansion valve
E.Copper tubing
Which of the following has lowest COP?
A.Vapour absorption cycle
B.Vapour compression cycle using wet compression
C.Vapour compression cycle using dry compression
D.Vapour compression cycle with superheated vapour at the end of compression
Refrigerant No. 717 is
A.Ammonia
B.Freon 12
C.Freon 22
D.Methyl chloride
E.Carbondioxide
The leakage in a refrigeration system using freon is detected by
A.Acetylene torch
B.Halide torch
C.Sulphur stricks
D.Soap and water
E.Any of the above
A hermetic compressor is
A.A reciprocating compressor
B.A valveless compressor
C.A thermodynamically efficient comprossor
D.A factory sealed unit containing motor and compressor
E.None of the above
The relation between vapour pressure to the enthalpy of vaporisation is expressed in
A.Energy equation
B.Vander wall’s equation
C.Lewis equation
D.Maxwell’s equation
E.Clausius Clapeyron equation
Dew point is
A.Percentage of moisture contained in a sample of air
B.Partial pressure of water vapour in a sample of air
C.The temperature of water vapour in air starts
D.The temperature at which condensation of water vapour in air starts
E.The temperature at which ice starts melting in presence of air without external aid
In which of the following plants secondary refrigerant is used?
A.Domestic refrigerator
B.Room air conditioner
C.Deep freezer
D.Ice plant
E.None of the above
