Top 250+ Solved Refrigeration and Air conditioning MCQ Questions Answer
Q. In a mechanical refrigeration system the refrigerant occurs as liquid (or very wet vapour) between
a. Before and after compressor
b. Expansion valve or evaporator
c. Condenser and expansion valve
d. Evaporation valve and compressor
e. Compressor outlet and condenser
Q. The ratio of specific humidity of moist air to the specific immidity of the saturated air at the same temperature, is known as
a. Absolute humidity
b. Degree of saturation and degree of reaction
c. Relative humidity
d. Any of the above
e. None of the above
Q. Dehydration means
a. Removing steam from any matter
b. Removing water from any matter
c. Removing hydrogen from any matter
d. Removing hydrogen from a hydrocarbon
e. Removing hydrogen from a mixture
Q. 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
Q. A cooling tower in a refrigeration system
a. Removes heat from refrigerant
b. Removes heat from brine
c. Removes heat from lubricating oil
d. Removes heat from hot water coming out of condenser
e. None of the above
Q. 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
Q. A refrigerant is added to vapour compression cycle through
a. High side in vapour form
b. High side in liquid form
c. Low side in liquid form
d. None of the above
e. Any of the above
Q. The horse power per ton of refrigerating effect when ammonia is used as a refrigerant, will be nearly
a. 5
b. 2
c. 0.1
d. 0.5
e. 1
Q. Dalton's law of partial pressure state that
a. All gases exert partial pressures only
b. All gases or mixture of gases exent partial pressures
c. All gases or mixture of gases in a container will exert their own pressure on the container entirely indipendent of the others
d. Total pressure exerted by a mixture of gases or vapours is equal to the pressure exerted by individual gases or vapours
e. None of the above
Q. When moisture is removed from air at constant dry bulb temperature the process is known as
a. Drying
b. Sensible cooling
c. Aeration
d. Deionisation
e. Dehumidification
Q. In a newly charged ammonia compression system, the clicking sound in the expansion valve indicates
a. High pressure after compression
b. Leakage of ammonia
c. Excessive ammonia charged
d. Lack of ammonia
e. Evaporator coils chocked
Q. The difference between wet and dry bulb temperature
a. Increases at atmospheric temperature
b. Increases as air gets wet
c. Increases as air gets drier
d. Remains constant always
e. None of the above
Q. 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
Q. 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