A Carnot refrigerator extracts 100 kcal of heat per minute from a cold room which is maintained at – 15?C and it is discharged to atmosphere 30C?. The horse power required to run the unit would be
A.1
B.1.5 to 2
C.2 to 5
D.5 to 6
E.More than 6
Category: Refrigeration and Air conditioning Mcqs
While designing air conditioning system for a theatre the various heat loads are categorized as given below. Which one will give lowest heat load?
A.Direct sun
B.Human beings
C.Lights
D.Outside temperature in summer
Of the following chemicals the liquid having the greatest cooling effect on an individual is
A.Water
B.Brine
C.Ether
D.Water containing ammonium hydroxide
E.Alcohol
Defrosting in a refrigerator may be done by
A.Stopping the compressor for a while
B.Opening the door of refrigerator
C.Placing trays of warm water in the refrigerator
D.Any of the above
E.None of the above
Cryogenics
A.Is same as refrigeration
B.Include heating and cooling of liquids
C.Is a thermodynamic analysis of low temperature systems
D.Is the field of engineering associated with development, production and use of equipment in the range -180?C to absolute zero
E.None of the above
Which of the following refrigerant has the freezing point?
A.Ammonia
B.Carbondioxide
C.Freon 11
D.Freon 22
Which of the following is not a dehydrator?
A.Silica sel
B.Molecular sieve
C.Calcium chloride
D.Sodium chloride
E.All of the above
In a mechanical refrigeration system the refrigerant occurs as liquid (or very wet vapour) between
A.Compressor outlet and condenser
B.Condenser and expansion valve
C.Expansion valve or evaporator
D.Evaporation valve and compressor
E.Before and after compressor
In case of freon as refrigerant the pipe lines should be of
A.Copper
B.Brass
C.Seamless steel tubes
D.Stainless steel tubes
E.None of the above
