1/4
1/3
3
4
D. 4
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
The mass of water vapour present in 1 m³ of dry air
The mass of water vapour present in 1 kg of dry air
The ratio of the actual mass of water vapour in a unit mass of dry air to the mass of water vapour in the same mass of dry air when it is saturated at the same temperature and pressure.
The ratio of actual mass of water vapour in a given volume of moist air to the mass of water vapour in the same volume of saturated air at the same temperature and pressure
Condensation of the refrigerant vapour
Evaporation of the refrigerant liquid
Compression of the refrigerant vapour
Metering of the refrigerant liquid
Remains constant
Increases
Decreases
None of these
Halocarbon refrigerants
Zoetrope refrigerants
Inorganic refrigerants
Hydrocarbon refrigerants
Higher in winter than in summer
Lower in winter than in summer
Same in winter and summer
Not dependent on season
Humidification
Dehumidification
Heating and humidification
Cooling and dehumidification
Increases C.O.P
Decreases C.O.P
C.O.P remains unaltered
Other factors decide C.O.P
Iron
Lead
Aluminium
Rubber
Ammonia
Carbon dioxide
Sulphur dioxide
R-12
Remains constant
Increases
Decreases
None of these
High risibility with oil
Low boiling point
Good electrical conductor
Large latent heat
Wet vapour region
Superheated vapour region
Sub-cooled liquid region
None of these
Cooled and humidified
Cooled and dehumidified
Heated and humidified
Heated and dehumidified
Cooling
Heating
Dehumidifying
All of these
Lack of cooling water
Water temperature being high
Dirty condenser surface
All of these
1/4
1/3
3
4
Dew point temperature decreases
Wet bulb temperature decreases
Dry bulb temperature increases
All of these
Will be higher
Will be lower
Will remain unaffected
May be higher or lower depending upon the nature of noncondensable gases
Low weight per tonne of refrigeration
High heat transfer rate
Low temperature at high altitudes
Higher coefficient of performance
Equal to
Less than
Greater than
None of these
Zero
0.5
0.75
1.0
Reversed Carnot cycle
Reversed Joule cycle
Reversed Brayton cycle
Reversed Otto cycle
Constant pressure valve
Constant temperature valve
Constant superheat valve
None of these
It is not affected by the moisture present in the air
Its bulb is surrounded by a wet cloth exposed to the air
The moisture present in it begins to condense
None of the above
Automatic expansion valve
High side float valve
Thermostatic expansion valve
Low side float valve
Near critical temperature of refrigerant
Above critical temperature
At critical Temperature
Much below critical temperature
Wet bulb temperature
Relative humidity
Dry bulb temperature
Specific humidity
Condenser
Evaporator
Absorber
Condenser, absorber and separator (rectifier)