Which of the following are synonyms?
A.Humidity ratio and specific humidity
B.Degree of saturation and degree of reaction
C.Sensible cooling and dehumidification
D.Relative humidity and specific humidity
E.Dehumidification
Category: Refrigeration and Air conditioning Mcqs
For better performance a desert cooler
A.Should be placed inside the room
B.Should be placed outside
C.Should be mounted on window
D.Should be placed at the roof level
E.None of the above
Cooling towers are used for cooling water
A.To be injected in circulating air
B.To be used for humidification
C.To be used for filtration of air
D.To be used for cooling the compressor
E.To be used for cooling the building
The function of desuperheating coil in a condenser is
A.To remove heat from condenser
B.To improve performance of a condenser
C.To discharge the heat exchanged in condenser to the surroundings
D.To remove the heat of superheat of the refrigerant before it enters the condenser
E.None of the above
The ratio of mass of water vapour associated with unit mass of dry air to the mass of water vapour associated with unit mass of dry air saturated at the same temperature is known as
A.Relative humidity
B.Specific humidity decreases
C.Humidity ratio
D.Degree of saturation
E.None of the above
In a vapour compression refrigeration cycle, high head pressure is indicated which does not change even when compressor is stopped and allowed to cool. The probable cause may be
A.High refrigerant charge
B.Low refrigerant charge
C.Air in the system
D.High vapour pressure
E.Any of the above
Major modification required to produce temperature of – 200?C in a vapour compression refrigeration system using Freon 12 as refrigerant, is
A.Size of compressor required would be large to handle volumes of vapour
B.Compression ratio has to be restricted till stronger body of compressor is needed
C.Condenser capacity must be increased to handle the refrigerant
D.Insulation should be capable of withstanding such low temperatures
E.Freon 12 cannot be used for such low temperatures
The statement: If a maximum of gases or vapours is enclosed in a container, each will exert its own pressure on the container entirely independent of the others and the total absolute pressure will be equal to the sum of the partial pressure exerted by each of the gases. This statement is known as
A.Newton’s law of gases
B.Kinetic theory of gases
C.Fick’s law
D.Avogadro’s hypothesis
E.Dalton’s law of partial pressures.
In halide torch test if there is leakage of refrigerant, the colour of flame with change to
A.Yellow
B.Red or pink
C.Violet or orange
D.Black or grey
E.Blue or bright green
A thermometer in the compressor discharge line
A.Confirms the flow of refrigerant
B.Indicates the efficiency of cycle
C.Helps in adjusting the compressor performance
D.Shows the heat of refrigerant leaving the cylinder on way to the condenser
E.None of the above
