(td₁ -td₃)/( td₂ -td₃)
(td₂ -td₃)/( td₁ -td₃)
(td₃ -td₁)/( td₂ -td₃)
(td₃ -td₂)/( td₁ -td₃)
B. (td₂ -td₃)/( td₁ -td₃)
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
(hA - h2)/ (h1 - h2)
(h2 - hA)/ (h1 - h2)
(h1 - h2)/ (hA - h2)
(hA - h1)/ (h2 - h1)
Condenser and expansion valve
Compressor and evaporator
Expansion valve and evaporator
Compressor and condenser
In vapour absorption refrigerator, the compression of refrigerant is avoided.
Sub-cooling can be achieved by circulating more quantity of cooling water through the condenser.
In vapour compression refrigeration, the vapour is drawn in the compressor cylinder during its suction stroke and is compressed adiabatically during the compression stroke.
All of the above
Ammonia
Carbon dioxide
Sulphur dioxide
R-12
Small displacements and low condensing pressures
Large displacements and high condensing pressures
Small displacements and high condensing pressures
Large displacements and low condensing pressures
Sub-cooling or under-cooling
Super-cooling
Normal cooling
None of these
Vertical and uniformly spaced
Horizontal and uniformly spaced
Horizontal and non-uniformly spaced
Curved lines
Reversed Carnot cycle
Bell Coleman cycle
Both (A) and (B)
None of these
Lower than atmospheric pressure
Higher than atmospheric pressure
Equal to atmospheric pressure
Could be anything
Electrically operated throttling valve
Manually operated valve
Thermostatic valve
Capillary tube
Dry air
Moist air
Saturated air
Specific humidity
Humidification
Dehumidification
Heating and humidification
Cooling and dehumidification
Halide torch
Sulphur sticks
Soap and water
All of these
After passing through the condenser
Before passing through the condenser
After passing through the expansion or throttle valve
Before entering the expansion valve
Automatic expansion valve
High side float valve
Thermostatic expansion valve
Low side float valve
Reversed Carnot cycle
Reversed Joule cycle
Reversed Brayton cycle
Reversed Otto cycle
T₁/(T₂ - T₁)
(T₂ - T₁)/T₁
(T₁ - T₂)/T₁
T₂/(T₂ - T₁)
3.5/C.O.P.
C.O.P/3.5
3.5 × C.O.P.
None of these
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
Lowers evaporation temperature
Increases power required per ton of refrigeration
Lowers compressor capacity because vapour is lighter
All of the above
Non-toxic
Non-flammable
Non-explosive
High boiling point
R-11
R-12
R-22
Ammonia
Results in loss of heat due to poor heat transfer
Increases heat transfer rate
Is immaterial
Can be avoided by proper design
Low weight per tonne of refrigeration
High heat transfer rate
Low temperature at high altitudes
Higher coefficient of performance
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
More
Less
Same
More for small capacity and less for high capacity
More
Less
Equally
Unpredictable
Reciprocating
Rotating
Centrifugal
Screw
These react with water vapour and cause acid rain
These react with plants and cause greenhouse effect
These react with oxygen and cause its depletion
These react with ozone layer