Reciprocating
Rotating
Centrifugal
Screw
C. Centrifugal
0.1 to 0.3 TR
1 to 3 TR
3 to 5 TR
5 to 7 TR
(e₁ + e₂)/ e₁ + e₂ - e₁e₂
1/e₁ + 1/e₂
e₁ + e₂
e₁e₂
Heat supplied by the gas burner to the heat absorbed by the evaporator
Heat absorbed by the evaporator to the heat supplied by the gas burner
Heat supplied by the gas burner minus the heat absorbed by the evaporator to the heat supplied by the gas burner
Heat absorbed by the evaporator minus the heat supplied by the gas burner to the heat absorbed by the evaporator
Reciprocating
Rotating
Centrifugal
Screw
Carbon dioxide
Sulphur dioxide
Lithium bromide
R-12
The constant enthalpy lines are also constant wet bulb temperature lines.
The wet bulb and dry bulb temperature are equal at saturation condition.
The wet bulb temperature is a measure of enthalpy of moist air.
All of the above
(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
0.622 Pv/ (Pb - Pv)
μ/[1 - (1 - μ) (Ps/Pb)]
[Pv (Pb - Pd)]/ [Pd (Pb - Pv)]
None of these
Raise the pressure of the refrigerant
Raise the temperature of the refrigerant
Circulate the refrigerant through the refrigerating system
All of the above
Cooled and humidified
Cooled and dehumidified
Heated and humidified
Heated and dehumidified
Suction pressure
Discharge pressure
Critical pressure
Back pressure
Remains constant
Increases
Decreases
None of these
Remains constant
Increases
Decreases
None of these
Vapour compression
Vapour absorption
Carnot cycle
Electrolux refrigerator
1.33
2.33
3.33
4.33
Before compressor
Between compressor and condenser
Between condenser and evaporator
Between condenser and expansion valve
0.2
1.2
5
6
20°C DBT and 50% RH
26°C DBT and 50% RH
20°C DBT and 60% RH
26°C DBT and 60% RH
Iron
Lead
Aluminium
Rubber
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
20 to 50°C
50 to 70°C
70 to 110°C
None of these
Very little work input
Maximum work input
Nearly same work input as for vapour compression cycle
Zero work input
Small displacements and low condensing pressures
Large displacements and high condensing pressures
Small displacements and high condensing pressures
Large displacements and low condensing pressures
Relative humidity
Dew point temperature
Dry bulb temperature
Wet bulb temperature
Positive
Negative
Zero
None of these
More
Less
Equally
Unpredictable
Above which liquid will remain liquid
Above which liquid becomes gas
Above which liquid becomes vapour
Above which liquid becomes solid
Atmospheric pressure
Slightly above atmospheric pressure
24 bars
56 bars
1 : 1
1 : 9
9 : 1
1 : 3
Positive
Negative
Zero
None of these