Remains constant
Increases
Decreases
None of these
B. Increases
(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
Halide torch
Sulphur sticks
Soap and water
All of these
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
Critical pressure of refrigerant
Much below critical pressure
Much above critical pressure
Near critical pressure
Will be higher
Will be lower
Will remain unaffected
May be higher or lower depending upon the nature of noncondensable gases
Suction pressure
Discharge pressure
Critical pressure
Back pressure
Equal to
Less than
Greater than
None of these
Ammonia
Carbon dioxide
Sulphur dioxide
R-12
After passing through the condenser
Before passing through the condenser
After passing through the expansion or throttle valve
Before entering the expansion valve
Lowers evaporation temperature
Increases power required per ton of refrigeration
Lowers compressor capacity because vapour is lighter
All of the above
Vertical and uniformly spaced
Horizontal and uniformly spaced
Horizontal and non-uniformly spaced
Curved lines
Vapour compression
Vapour absorption
Carnot cycle
Electrolux refrigerator
1 : 1
1 : 9
9 : 1
1 : 3
A gas will never liquefy
A gas will immediately liquefy
Water will evaporate
Water will never evaporate
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
Relative humidity remains constant
Wet bulb temperature increases
Specific humidity increases
Partial pressure of vapour remains constant
Suction pressure
Discharge pressure
Critical pressure
Back pressure
Condenser tubes
Evaporator tubes
Refrigerant cooling tubes
Capillary tubes
Small displacements and low condensing pressures
Large displacements and high condensing pressures
Small displacements and high condensing pressures
Large displacements and low condensing pressures
Remains constant
Increases
Decreases
None of these
Same
Lower
Higher
None of these
Remains constant
Increases
Decreases
None of these
Low weight per tonne of refrigeration
High heat transfer rate
Low temperature at high altitudes
Higher coefficient of performance
Compressor and condenser
Condenser and receiver
Receiver and evaporator
Evaporator and compressor
Near critical temperature of refrigerant
Above critical temperature
At critical Temperature
Much below critical temperature
Degree of superheat at exit from the evaporator
Temperature of the evaporator
Pressure in the evaporator
None of the above
Ammonia
Carbon dioxide
Sulphur dioxide
Fluorine
After passing through the condenser
Before passing through the condenser
After passing through the expansion throttle valve
Before entering the expansion valve
Wet bulb temperature
Relative humidity
Dry bulb temperature
Specific humidity
(Theoretical C.O.P.)/ (Actual C.O.P.)
(Actual C.O.P.) /(Theoretical C.O.P.)
(Actual C.O.P.) × (Theoretical C.O.P.)
None of these