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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