Equal to
Less than
More than
None of these
B. Less than
(hA - h2)/ (h1 - h2)
(h2 - hA)/ (h1 - h2)
(h1 - h2)/ (hA - h2)
(hA - h1)/ (h2 - h1)
Liquid
Sub-cooled liquid
Saturated liquid
Wet vapour
Vertical and uniformly spaced
Horizontal and uniformly spaced
Horizontal and non-uniformly spaced
Curved lines
Constant pressure lines
Constant temperature lines
Constant total heat lines
Constant entropy lines
-86.6°C
-95.2°C
-107.7°C
-135.8°C
The mass of water vapour present in 1 m³ of dry air
The mass of water vapour present in 1 kg of dry air
The ratio of the actual mass of water vapour in a unit mass of dry air to the mass of water vapour in the same mass of dry air when it is saturated at the same temperature and pressure.
The ratio of actual mass of water vapour in a given volume of moist air to the mass of water vapour in the same volume of saturated air at the same temperature and pressure
Raise the pressure of the refrigerant
Raise the temperature of the refrigerant
Circulate the refrigerant through the refrigerating system
All of the above
Inflammable
Toxic
Non-inflammable and toxic
Nontoxic and non-inflammable
Mean radiant temperature
Effective temperature
Dew point temperature
None of these
B.P.F. - 1
1 - B. P.F.
1/ B.P.F.
1 + B.P.F.
Freon-12
NH3
CO2
Freon-22
Critical pressure of refrigerant
Much below critical pressure
Much above critical pressure
Near critical pressure
More
Less
Same
More/less depending on size of plant
Halide torch which on detection produces greenish flame lighting
Sulphur sticks which on detection gives white smoke
Using reagents
Smelling
Of cooling medium
Of freezing zone
Of evaporator
At which refrigerant gas becomes liquid
Gives noisy operation
Gives quiet operation
Requires little power consumption
Cools below 0°C
Same
Low
Very low
High
Remains constant
Increases
Decreases
None of these
High pressure saturated liquid
Wet vapour
Very wet vapour
Dry vapour
Saturation point of vapour
Saturation point of liquid
Sublimation temperature
Triple point
3.5/C.O.P.
C.O.P/3.5
3.5 × C.O.P.
None of these
It permits higher speeds to be used
It permits complete evaporation in the evaporator
It results in high volumetric and mechanical efficiency
All of the above
Condenser tubes
Evaporator tubes
Refrigerant cooling tubes
Capillary tubes
(C.O.P.)P = (C.O.P.)R + 2
(C.O.P.)P = (C.O.P.)R + 1
(C.O.P)P = (C.O.P)R - 1
(C.O.P)P = (C.O.P)R
Ammonia
Carbon dioxide
Freon
Brine
20 to 50°C
50 to 70°C
70 to 110°C
None of these
Simple air cooling system
Bootstrap air cooling system
Reduced ambient air cooling system
Regenerative air cooling system
A gas will never liquefy
A gas will immediately liquefy
Water will evaporate
Water will never evaporate
The performance of the vapour compression refrigerator varies considerably with both vaporising and condensing temperatures.
In vapour compression cycle, the useful part of the heat transfer is at the condenser.
In ammonia-hydrogen (Electrolux) refrigerator, no compressor, pump or fan is required.
The effect of under-cooling the liquid refrigerant is to decrease the coefficient of performance.
Commercial refrigerators
Domestic refrigerators
Air-conditioning
Gas liquefaction