Refrigeration And Air Conditioning Set 2

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This set of Refrigeration and Air conditioning Multiple Choice Questions & Answers (MCQs) focuses on Refrigeration And Air Conditioning Set 2

Q1 | Which of the following refrigerant has the freezing point?
  • Ammonia
  • Carbondioxide
  • Freon 11
  • Freon 22
  • All of the above
Q2 | Dehumidification means
  • Removing humidity from a space
  • Reducing the quantity of water vapour in a space
  • Reducing the moisture content of a substance
  • Any of the above
  • None of the above
Q3 | In a refrigeration system a condenser
  • Receives liquid refrigerant and supplies liquid refrigerant
  • Receives vapour refrigerant and supplies vapour refrigerant
  • Receives vapour refrigerant and supplies liquid refrigerant
  • Receives liquid refrigerant and supplies liquid refrigerant
  • None of the above
Q4 | Dry ice is
  • Free from water
  • Free from dissolved air or gases
  • Does not contain impurities
  • Solidified form of carbondioxide
  • None of the above
Q5 | A refrigerating machine working on Reversed Carnot cycle takes out 2 kW per minute of heat from the system while working between temperature limits of 300?K and 200?K. The C.O.P. and power consumed by the cycle will be
  • 2. 1 kW
  • 1, 2 kW
  • 1,1 kW
  • 0, 0 kW
  • 2, 2 kW
Q6 | In halide torch test if there is leakage of refrigerant, the colour of flame with change to
  • Violet or orange
  • Red or pink
  • Blue or bright green
  • Black or grey
  • Yellow
Q7 | If the discharge pressure of a refrigeration compressor is too high it shows
  • Too little or to warm condenser water
  • Lack of refrigerant
  • Excessive cooling load
  • Lack of compressor lubrication
  • Any of the above
Q8 | Oil separator in a refrigeration cycle is installed
  • Before compressor
  • Between condenser and evaporator
  • Between condenser and expansion vlve
  • Between compressor and condenser
  • Could be installed anywhere
Q9 | If a refrigerator compressor cuts out on starter overloads the probable reason could be
  • Low line voltage
  • Suction pressure high
  • Discharge pressure high
  • Compressor tight
  • Any of the above
Q10 | In electrolus refrigerator
  • Hydrogen evaporates in ammonia
  • Ammonia evaporates in hydrogen
  • Hydrogen is absorbed in water
  • Ammonia is absorbed in hydrogen
  • Ammonia is absorbed in water
Q11 | A condenser removes from the refrigerant
  • Sensible heat only
  • Latent heat only
  • Sensile heat and latent heat
  • Partly sensible heat and latent heat
  • None of the above
Q12 | During dehumidification process
  • Relative humidity decreases
  • Relative humidity does not change
  • Specific humidity decreases
  • Relative humidity increases
  • Specific humidity increases
Q13 | In a refrigerator evaporator is located
  • Inside the refrigerator cabinet
  • Adjacent to compressor
  • On the side of condenser
  • On the bottom of refrigerator cabinet
  • Behind the refrigerator cabinet
Q14 | In case of wet bulb depression is zero, it can be concluded that
  • Rain is likely to occur
  • Storm is likely to hit the place
  • Relative humidity is zero
  • Relative humidity is 100%
  • None of the above
Q15 | Freon type (halocarbons) refrigerants are
  • Poisonous
  • Coloured
  • Have peculiar odour
  • Irritating
  • Non-poisonous
Q16 | Brine is always used as a secondary refrigerant in
  • Cold storage plant
  • Milk chilling plant
  • Cinema hall air conditioning plants
  • Ice plant
  • All of the above
Q17 | The bulk of tubes at the back of the domestic refrigerator are
  • Condenser tubes
  • Evaporator tubes
  • Capillary tubes
  • Throttling device
  • Refrigerant cooling tubes
Q18 | 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
  • Freon 22
  • Carbondioxide
  • Freon 11
  • Freon 12
  • Ammonia
Q19 | Which of the following has lowest COP?
  • Vapour compression cycle using wet compression
  • Vapour compression cycle with superheated vapour at the end of compression
  • Vapour absorption cycle
  • Vapour compression cycle using dry compression
  • All the refrigerants have identical specific volume
Q20 | The performance of an evaporative condenser largely depends on
  • Wet bulb temperature
  • Dry bulb temperature
  • Hot water temperature
  • Ambient temperature
  • Air conditioned room temperature
Q21 | The rate of evaporation of water will be low when
  • Rate of evaporation does not depend on relative humidity
  • Sensible heat factor
  • Relative humidity is high
  • Reactive humidity is zero
  • Relative humidity is less than 50%
Q22 | Dry bulb temperature depends on
  • Humidity of air
  • Water vapour content of air
  • Condition of air
  • All above
  • None of the above
Q23 | In a psychrometric chart vertical lines indicate
  • Dew point temperature
  • Dry bulb temperature
  • Wet bulb temperature
  • Percentage humidity
  • Relative humidity
Q24 | In case of completely dry air
  • Total heat is same as latent heat
  • Total heat is same as sensible heat
  • Total heat is sum of sensible heat and latent heat
  • Total heat is sum of sensible heat required for all individual constituents
  • None of the above
Q25 | When the lower temperature is fixed, the COP of a refrigerating machine can be improved by
  • Operating the machine at higher speeds
  • Raising the higher temperature
  • Lowering the higher temperature
  • None of the above