Condensation of the refrigerant vapour
Evaporation of the refrigerant liquid
Compression of the refrigerant vapour
Metering of the refrigerant liquid
B. Evaporation of the refrigerant liquid
Absolute
Relative
Specific
None of these
Iron
Lead
Aluminium
Rubber
Gives noisy operation
Gives quiet operation
Requires little power consumption
Cools below 0°C
Wet bulb temperature
Dry bulb temperature
Dew point temperature
None of these
Lithium bromide is used as a refrigerant and water as an absorbent
Water is used as a refrigerant and lithium bromide as an absorbent
Ammonia is used as a refrigerant and lithium bromide as an absorbent
None of the above
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.
After passing through the condenser
Before passing through the condenser
After passing through the expansion or throttle valve
Before entering the expansion valve
Evaporator
Safety relief valve
Dehumidifier
Driers
Saturated liquid
Wet vapour
Dry saturated vapour
Superheated vapour
After passing through the condenser
Before passing through the condenser
After passing through the expansion or throttle valve
Before entering the compressor
Temperature of medium being cooled must be below that of the evaporator
Refrigerant leaves the condenser as liquid
All solar thermally operated absorption systems are capable only of intermittent operation
Frost on evaporator reduces heat transfer
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
Cooled and humidified
Cooled and dehumidified
Heated and humidified
Heated and dehumidified
2 bar
8 bar
15 bar
30 bar
Always less than unity
Always more than unity
Equal to unity
Any one of the above
Can be lower or higher than that of the entering air
Is lower than that of the entering air
Is higher than that of the entering air
None of the above
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
Dry bulb temperature
Wet bulb temperature
Dew point temperature
Specific humidity
Humidity ratio
Relative humidity
Absolute humidity
Degree of saturation
Same
Lower
Higher
None of these
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
0.2
1.2
5
6
Small displacements and low condensing pressures
Large displacements and high condensing pressures
Small displacements and high condensing pressures
Large displacements and low condensing pressures
Results in loss of heat due to poor heat transfer
Increases heat transfer rate
Is immaterial
Can be avoided by proper design
Dew point temperature of air
Wet bulb temperature of air
Dry bulb temperature of air
Ambient air temperature
Compressor
Condenser
Evaporator
Expansion valve
Before compressor
Between compressor and condenser
Between condenser and evaporator
Between condenser and expansion valve
Inflammable
Toxic
Non-inflammable and toxic
Nontoxic and non-inflammable
(td₂ - td₃)/(td₃ - td₁)
(td₃ - td₂)/(td₃ - td₁)
(td₃ - td₁)/(td₂ - td₃)
(td₃ - td₁)/(td₃ - td₂)
Low boiling point
High critical temperature
High latent heat of vaporisation
All of these