Liquid
Sub-cooled liquid
Saturated liquid
Wet vapour
D. Wet vapour
Dry bulb temperature
Wet bulb temperature
Dew point temperature
Relative humidity
0.1 to 0.3 TR
1 to 3 TR
3 to 5 TR
5 to 7 TR
T₁/(T₂ - T₁)
(T₂ - T₁)/T₁
(T₁ - T₂)/T₁
T₂/(T₂ - T₁)
Iron
Lead
Aluminium
Rubber
1 m3 of wet air
1 m3 of dry air
1 kg of wet air
1 kg of dry air
Reciprocating
Rotating
Centrifugal
Screw
Isentropic compression process
Constant pressure cooling process
Isentropic expansion process
Constant pressure expansion process
Does not alter C.O.P.
Increases C.O.P.
Decreases C.O.P.
None of these
Low weight per tonne of refrigeration
High heat transfer rate
Low temperature at high altitudes
Higher coefficient of performance
Cost is too high
Capacity control is not possible
It is made of copper
Required pressure drop cannot be achieved
Collect liquid refrigerant and prevent it from going to compressor
Detect liquid in vapour
Superheat the vapour
Collect vapours
After passing through the condenser
Before passing through the condenser
After passing through the expansion or throttle valve
Before entering the expansion valve
Very little work input
Maximum work input
Nearly same work input as for vapour compression cycle
Zero work input
Before compressor
Between compressor and condenser
Between condenser and evaporator
Between condenser and expansion valve
Same
Lower
Higher
None of these
Compressor and condenser
Condenser and receiver
Receiver and evaporator
Evaporator and compressor
Condenser and expansion valve
Compressor and evaporator
Expansion valve and evaporator
Compressor and condenser
Horizontal line
Vertical line
Inclined line
Curved line
Commercial refrigerators
Domestic refrigerators
Air-conditioning
Gas liquefaction
1.86 kW
3.72 kW
7.44 kW
18.6 kW
Small
High
Equal
Anything
Superheated vapour refrigerant
Dry saturated liquid refrigerant
A mixture of liquid and vapour refrigerant
None of these
Colourless
Odourless
Non-flammable
All of these
Compressor
Condenser
Evaporator
Expansion valve
After passing through the condenser
Before passing through the condenser
After passing through the expansion throttle valve
Before entering the expansion valve
Increased to a value above its critical temperature
Reduced to a value below its critical temperature
Equal to critical temperature
None of the above
Ammonia
Carbon dioxide
Sulphur dioxide
R-12
(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
Water
Ammonia
Freon
Aqua-ammonia
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