Top 250+ Solved Refrigeration and Air conditioning MCQ Questions Answer
Q. If the discharge pressure of a refrigeration compressor is too high it shows
a. Too little or to warm condenser water
b. Lack of refrigerant
c. Excessive cooling load
d. Lack of compressor lubrication
e. Any of the above
Q. Oil separator in a refrigeration cycle is installed
a. Before compressor
b. Between condenser and evaporator
c. Between condenser and expansion vlve
d. Between compressor and condenser
e. Could be installed anywhere
Q. If a refrigerator compressor cuts out on starter overloads the probable reason could be
a. Low line voltage
b. Suction pressure high
c. Discharge pressure high
d. Compressor tight
e. Any of the above
Q. In electrolus refrigerator
a. Hydrogen evaporates in ammonia
b. Ammonia evaporates in hydrogen
c. Hydrogen is absorbed in water
d. Ammonia is absorbed in hydrogen
e. Ammonia is absorbed in water
Q. A condenser removes from the refrigerant
a. Sensible heat only
b. Latent heat only
c. Sensile heat and latent heat
d. Partly sensible heat and latent heat
e. None of the above
Q. During dehumidification process
a. Relative humidity decreases
b. Relative humidity does not change
c. Specific humidity decreases
d. Relative humidity increases
e. Specific humidity increases
Q. In a refrigerator evaporator is located
a. Inside the refrigerator cabinet
b. Adjacent to compressor
c. On the side of condenser
d. On the bottom of refrigerator cabinet
e. Behind the refrigerator cabinet
Q. In case of wet bulb depression is zero, it can be concluded that
a. Rain is likely to occur
b. Storm is likely to hit the place
c. Relative humidity is zero
d. Relative humidity is 100%
e. None of the above
Q. Freon type (halocarbons) refrigerants are
a. Poisonous
b. Coloured
c. Have peculiar odour
d. Irritating
e. Non-poisonous
Q. Brine is always used as a secondary refrigerant in
a. Cold storage plant
b. Milk chilling plant
c. Cinema hall air conditioning plants
d. Ice plant
e. All of the above
Q. The bulk of tubes at the back of the domestic refrigerator are
a. Condenser tubes
b. Evaporator tubes
c. Capillary tubes
d. Throttling device
e. Refrigerant cooling tubes
Q. Out of the following refrigerants which one will provide highest compressor displacement per tonne of refrigeration in a vapour compression system operating between fixed temperatures
a. Freon 22
b. Carbondioxide
c. Freon 11
d. Freon 12
e. Ammonia
Q. Which of the following has lowest COP?
a. Vapour compression cycle using wet compression
b. Vapour compression cycle with superheated vapour at the end of compression
c. Vapour absorption cycle
d. Vapour compression cycle using dry compression
e. All the refrigerants have identical specific volume
Q. The performance of an evaporative condenser largely depends on
a. Wet bulb temperature
b. Dry bulb temperature
c. Hot water temperature
d. Ambient temperature
e. Air conditioned room temperature
Q. The rate of evaporation of water will be low when
a. Rate of evaporation does not depend on relative humidity
b. Sensible heat factor
c. Relative humidity is high
d. Reactive humidity is zero
e. Relative humidity is less than 50%