Remains constant
Increases
Decreases
None of these
C. Decreases
Receiver
Expansion valve
Evaporator
Compressor discharge
Dry bulb depression
Wet bulb depression
Dew point depression
Degree of saturation
Non-toxic
Non-inflammable
Toxic and non-inflammable
Highly toxic and inflammable
Higher in winter than in summer
Lower in winter than in summer
Same in winter and summer
Not dependent on season
Ammonia
Carbon dioxide
Freon
Brine
Saturation point of vapour
Saturation point of liquid
Sublimation temperature
Triple point
Low weight per tonne of refrigeration
High heat transfer rate
Low temperature at high altitudes
Higher coefficient of performance
Absolute
Relative
Specific
None of these
Pressure lines
Temperature lines
Total heat lines
Entropy lines
Same
Less
More
None of these
Decrease in fin spacing and increase in number of rows
Increase in fin spacing and increase in number of rows
Increase in fin spacing and decrease in number of rows
Decrease in fin spacing and decrease in number of rows
Relative humidity
Dew point temperature
Dry bulb temperature
Wet bulb temperature
CO₂
Ammonia
R-12
All of these
(td₂ - td₃)/(td₃ - td₁)
(td₃ - td₂)/(td₃ - td₁)
(td₃ - td₁)/(td₂ - td₃)
(td₃ - td₁)/(td₃ - td₂)
Reduce compressor overheating
Reduce compressor discharge temperature
Increase cooling effect
Ensure that only liquid and not the vapour enters the expansion (throttling) valve
Vapour compression
Vapour absorption
Carnot cycle
Electrolux refrigerator
Remains constant
Increases
Decreases
None of these
1 : 1
1 : 9
9 : 1
1 : 3
0.622 Pv/ (Pb - Pv)
μ/[1 - (1 - μ) (Ps/Pb)]
[Pv (Pb - Pd)]/ [Pd (Pb - Pv)]
None of these
R-11
R-12
R-22
Ammonia
Remains constant
Increases
Decreases
None of these
Ammonia
Carbon dioxide
Sulphur dioxide
R-12
Same as
Lower than
Higher than
None of these
Dehumidification
Cooling and humidification
Cooling and dehumidification
Dehumidification and pure sensible cooling
(C.O.P.)P = (C.O.P.)R + 2
(C.O.P.)P = (C.O.P.)R + 1
(C.O.P)P = (C.O.P)R - 1
(C.O.P)P = (C.O.P)R
These react with water vapour and cause acid rain
These react with plants and cause greenhouse effect
These react with oxygen and cause its depletion
These react with ozone layer
Remains constant
Increases
Decreases
None of these
Colourless
Odourless
Non-flammable
All of these
1 m3 of wet air
1 m3 of dry air
1 kg of wet air
1 kg of dry air
Remains constant
Increases
Decreases
None of these