Heated and dehumidified
Heated and humidified
Cooled and humidified
Cooled and dehumidified
B. Heated and humidified
In vapour absorption refrigerator, the compression of refrigerant is avoided.
Sub-cooling can be achieved by circulating more quantity of cooling water through the condenser.
In vapour compression refrigeration, the vapour is drawn in the compressor cylinder during its suction stroke and is compressed adiabatically during the compression stroke.
All of the above
R-11
R-12
R-22
Ammonia
Remains constant
Increases
Decreases
None of these
Freezing at the expansion valve
Restriction to refrigerant flow
Corrosion of steel plates
All of these
Compressor
Condenser
Evaporator
Expansion valve
Vertical and uniformly spaced
Horizontal and uniformly spaced
Horizontal and non-uniformly spaced
Curved lines
High pressure liquid refrigerant
Low pressure liquid and vapour refrigerant
Low pressure vapour refrigerant
None of these
Does not alter C.O.P.
Increases C.O.P.
Decreases C.O.P.
None of these
High pressure saturated liquid
Wet vapour
Very wet vapour
Dry vapour
Copper
Aluminium
Steel
Brass
0.3
0.6
0.67
1.5
Wet bulb temperature
Relative humidity
Dry bulb temperature
Specific humidity
Halide torch
Sulphur sticks
Soap and water
All of these
Freezing coil
Cooling coil
Chilling coil
All of these
Remains constant
Increases
Decreases
None of these
Humidity ratio
Relative humidity
Absolute humidity
Degree of saturation
Ensures the evaporator completely filled with refrigerant of the load
Is suitable only for constant load systems
Maintains different temperatures in evaporator in proportion to load
None of the above
Wet bulb temperature
Relative humidity
Dry bulb temperature
Specific humidity
Same
Low
Very low
High
Compressor
Condenser
Evaporator
Expansion valve
Remains constant
Increases
Decreases
None of these
25°C DBT and 100% RH
20°C DBT and 80% RH
22°C DBT and 60% RH
25°C DBT and 40% RH
1.25
0.8
0.5
0.25
After passing through the condenser
Before passing through the condenser
After passing through the expansion or throttle valve
Before entering the compressor
CO₂
Ammonia
R-12
All of these
Non-toxic
Non-inflammable
Toxic and non-inflammable
Highly toxic and inflammable
(td₂ - td₃)/(td₃ - td₁)
(td₃ - td₂)/(td₃ - td₁)
(td₃ - td₁)/(td₂ - td₃)
(td₃ - td₁)/(td₃ - td₂)
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
Vertical and uniformly spaced
Horizontal and uniformly spaced
Horizontal and non-uniformly spaced
Curved lines
-10.5°C
-30°C
-33.3°C
-77.7°C