Increases C.O.P
Decreases C.O.P
C.O.P remains unaltered
Other factors decide C.O.P
A. Increases C.O.P
Increase
Decrease
May increase or decrease depending on the type of refrigerant used
Remain unaffected
After passing through the condenser
Before passing through the condenser
After passing through the expansion or throttle valve
Before entering the expansion valve
Increases C.O.P
Decreases C.O.P
C.O.P remains unaltered
Other factors decide C.O.P
Liquid
Sub-cooled liquid
Saturated liquid
Wet vapour
Constant pressure valve
Constant temperature valve
Constant superheat valve
None of these
Automatic expansion valve
High side float valve
Thermostatic expansion valve
Low side float valve
Condenser tubes
Evaporator tubes
Refrigerant cooling tubes
Capillary tubes
Frosting evaporator
Non-frosting evaporator
Defrosting evaporator
None of these
Compressor
Condenser
Expansion valve
Evaporator
(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
Condenser and expansion valve
Compressor and evaporator
Expansion valve and evaporator
Compressor and condenser
Halide torch
Sulphur sticks
Soap and water
All of these
0.1 ton
5 tons
10 tons
40 tons
20 to 50°C
50 to 70°C
70 to 110°C
None of these
Operating the machine at higher speeds
Operating the machine at lower speeds
Raising the higher temperature
Lowering the higher temperature
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
210 kJ/ min
21 kJ/ min
420 kJ/ min
840 kJ/ min
Strong solution to weak solution
Weak solution to strong solution
Strong solution to ammonia vapour
Ammonia vapours to weak solution
Is less than 1
Is more than 1
Is equal to 1
Depends upon the make
(td₂ - td₃)/(td₃ - td₁)
(td₃ - td₂)/(td₃ - td₁)
(td₃ - td₁)/(td₂ - td₃)
(td₃ - td₁)/(td₃ - td₂)
m/hK
m/h
m²/h
m²/hK
Atmospheric pressure
Slightly above atmospheric pressure
24 bars
56 bars
Vapour compression cycle
Vapour absorption cycle
Air refrigeration cycle
None of these
Inflammable
Toxic
Non-inflammable and toxic
Nontoxic and non-inflammable
1.33
2.33
3.33
4.33
B.P.F. - 1
1 - B.P.F.
1/ B.P.F.
1 + B.P.F.
Saturated liquid
Wet vapour
Dry saturated vapour
Superheated vapour
Wet vapour region
Superheated vapour region
Sub-cooled liquid region
None of these
In 1 hour
In 1 minute
In 24 hours
In 12 hours
Mean radiant temperature
Effective temperature
Dew point temperature
None of these