Ammonia
Carbon dioxide
Sulphur dioxide
R-12
B. Carbon dioxide
One cooling turbine and one heat exchanger
One cooling turbine and two heat exchangers
Two cooling turbines and one heat exchanger
Two cooling turbines and two heat exchangers
Liquid
Sub-cooled liquid
Saturated liquid
Wet vapour
Same
More
Less
More or less depending on ambient conditions
Coefficient of performance of refrigeration
Coefficient of performance of heat pump
Relative coefficient of performance
Refrigerating efficiency
The human body can lose heat even if its temperature is less than the atmospheric temperature.
The increase in air movement increases the evaporation from the human body.
The warm air increases the rate of radiation of heat from the human body.
Both (A) and (B)
Between the combustion chamber and the first heat exchanger
Between the first heat exchanger and the secondary compressor
Between the secondary compressor and the second heat exchanger
Between the second heat exchanger and the cooling turbine
Suction pressure
Discharge pressure
Critical pressure
Back pressure
Collect liquid refrigerant and prevent it from going to compressor
Detect liquid in vapour
Superheat the vapour
Collect vapours
Critical pressure of refrigerant
Much below critical pressure
Much above critical pressure
Near critical pressure
Receiver
Expansion valve
Evaporator
Compressor discharge
Water and water
Water and lithium bromide
Ammonia and lithium bromide
Ammonia and water
Humidification
Dehumidification
Heating and humidification
Cooling and dehumidification
Vapour compression
Vapour absorption
Carnot cycle
Electrolux refrigerator
Dehumidification
Cooling and humidification
Cooling and dehumidification
Dehumidification and pure sensible cooling
Increases heat transfer
Improves C.O.P. of the system
Increases power consumption
Reduces power consumption
More
Less
Same
More for small capacity and less for high capacity
25 kJ/kg
50 kJ/kg
100 kJ/kg
125 kJ/kg
Single fluid
Two fluids
Three fluids
None of these
Ammonia
Carbon dioxide
Sulphur dioxide
R-12
Ammonia
Carbon dioxide
Sulphur dioxide
Fluorine
0.1 to 0.5 h.p. per ton of refrigeration
0.5 to 0.8 h.p. per ton of refrigeration
1 to 2 h.p. per ton of refrigeration
2 to 5 h.p. per ton of refrigeration
Vapour compression cycle
Vapour absorption cycle
Air refrigeration cycle
None of these
Remains constant
Increases
Decreases
None of these
Condenser and expansion valve
Compressor and evaporator
Expansion valve and evaporator
Compressor and condenser
Above which liquid will remain liquid
Above which liquid becomes gas
Above which liquid becomes vapour
Above which liquid becomes solid
Bright green
Yellow
Red
Orange
Compression
Expansion
Condensation
Evaporation
Ensures the evaporator completely filled with refrigerant of the load
Is suitable only for constant load systems
Maintains different temperatures in evaporator in proportion to load
None of the above
Remains constant
Increases
Decreases
None of these
Circulating more quantity of cooling water through the condenser
Using water colder than the main circulating water
Employing a heat exchanger
Any one of the above