Raise the pressure of the refrigerant
Raise the temperature of the refrigerant
Circulate the refrigerant through the refrigerating system
All of the above
D. All of the above
0.3
0.6
0.67
1.5
Reciprocating
Rotating
Centrifugal
Screw
Positive
Negative
Zero
None of these
Humidity ratio
Relative humidity
Absolute humidity
Degree of saturation
Remains constant
Increases
Decreases
None of these
B.P.F. - 1
1 - B. P.F.
1/ B.P.F.
1 + B.P.F.
Commercial refrigerators
Domestic refrigerators
Air-conditioning
Gas liquefaction
Same as
Lower than
Higher than
None of these
Inflammable
Toxic
Non-inflammable and toxic
Nontoxic and non-inflammable
Constant pressure valve
Constant temperature valve
Constant superheat valve
None of these
Remains constant
Increases
Decreases
None of these
50 kcal/ min
50 kcal/ hr
80 kcal/ min
80 kcal/ hr
1 + C.O.P
1 - C.O.P.
1 + (1/C.O.P)
1 - (1/C.O.P)
Dry bulb depression
Wet bulb depression
Dew point depression
Degree of saturation
Saturation point of vapour
Saturation point of liquid
Sublimation temperature
Triple point
Dry bulb temperature is higher than wet bulb temperature
Dew point temperature is lower than wet bulb temperature
Dry bulb, wet bulb and dew point temperature are same
Dry bulb temperature is higher than dew point temperature
After passing through the condenser
Before passing through the condenser
After passing through the expansion or throttle valve
Before entering the compressor
Pressure lines
Temperature lines
Total heat lines
Entropy lines
(e₁ + e₂)/ e₁ + e₂ - e₁e₂
1/e₁ + 1/e₂
e₁ + e₂
e₁e₂
Horizontal line
Vertical line
Inclined line
Curved line
Same
Lower
Higher
None of these
Ammonia
Carbon dioxide
Sulphur dioxide
R-12
Condenser
Evaporator
Compressor
Expansion valve
Iron
Lead
Aluminium
Rubber
20°C DBT and 50% RH
26°C DBT and 50% RH
20°C DBT and 60% RH
26°C DBT and 60% RH
Lower than atmospheric pressure
Higher than atmospheric pressure
Equal to atmospheric pressure
Could be anything
Zero
20
50
100
Wet bulb temperature
Relative humidity
Dry bulb temperature
Specific humidity
It has low operating pressures
It gives higher coefficient of performance
It is miscible with oil over large range of temperatures
All of the above
Compressor
Condenser
Evaporator
Expansion valve