Wet bulb temperature
Relative humidity
Dry bulb temperature
Specific humidity
C. Dry bulb temperature
Ammonia
R-12
Sulphur dioxide
Carbon dioxide
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
Increases C.O.P
Decreases C.O.P
C.O.P remains unaltered
Other factors decide C.O.P
Automatic expansion valve
High side float valve
Thermostatic expansion valve
Low side float valve
Cooled and humidified
Cooled and dehumidified
Heated and humidified
Heated and dehumidified
Vertical and uniformly spaced
Horizontal and uniformly spaced
Horizontal and non-uniformly spaced
Curved lines
Increase
Decrease
May increase or decrease depending on the type of refrigerant used
Remain unaffected
Wet bulb temperature
Relative humidity
Dry bulb temperature
Specific humidity
High pressure saturated liquid
Wet vapour
Very wet vapour
Dry vapour
Equalise
Reduce
Increase
None of these
Above which liquid will remain liquid
Above which liquid becomes gas
Above which liquid becomes vapour
Above which liquid becomes solid
25°C DBT and 100% RH
20°C DBT and 80% RH
22°C DBT and 60% RH
25°C DBT and 40% RH
Heat of compression
Work done by compressor
Enthalpy increase in compressor
All of the above
Superheated vapour refrigerant
Dry saturated liquid refrigerant
A mixture of liquid and vapour refrigerant
None of these
Higher in winter than in summer
Lower in winter than in summer
Same in winter and summer
Not dependent on season
Wet bulb temperature
Relative humidity
Dry bulb temperature
Specific humidity
0.376
0.4
0.6
0.67
It considerably reduces mass of the system
It improves the C.O.P., as the condenser is small
The positive work in isentropic expansion of liquid is very small
It leads to significant cost reduction
(Theoretical C.O.P.)/ (Actual C.O.P.)
(Actual C.O.P.) /(Theoretical C.O.P.)
(Actual C.O.P.) × (Theoretical C.O.P.)
None of these
0.1 ton
5 tons
10 tons
40 tons
Saturated liquid
Wet vapour
Dry saturated vapour
Superheated vapour
Colourless
Odourless
Non-flammable
All of these
Remains constant
Increases
Decreases
None of these
Degree of superheat at exit from the evaporator
Temperature of the evaporator
Pressure in the evaporator
None of the above
Dry bulb temperature
Wet bulb temperature
Dew point temperature
Specific humidity
Near critical temperature of refrigerant
Above critical temperature
At critical Temperature
Much below critical temperature
CO₂
Ammonia
R-12
All of these
The standard unit used in refrigeration problems
The cooling effect produced by melting 1 ton of ice
The refrigeration effect to freeze 1 ton of water at 0°C into ice at 0°C in 24 hours
The refrigeration effect to produce 1 ton of ice at NTP conditions
High pressure liquid refrigerant
Low pressure liquid and vapour refrigerant
Low pressure vapour refrigerant
None of these
Same
Less
More
None of these