(e₁ + e₂)/ e₁ + e₂ - e₁e₂
1/e₁ + 1/e₂
e₁ + e₂
e₁e₂
A. (e₁ + e₂)/ e₁ + e₂ - e₁e₂
Which lies between the dry bulb and wet bulb temperatures of the incoming stream
Which lies between the wet bulb and dew point temperatures of the incoming stream
Which is lower than the dew point temperature of the incoming stream
Of adiabatic saturation of incoming stream
Saturated liquid
Wet vapour
Dry saturated vapour
Superheated vapour
Same as
Lower than
Higher than
None of these
Decrease in fin spacing and increase in number of rows
Increase in fin spacing and increase in number of rows
Increase in fin spacing and decrease in number of rows
Decrease in fin spacing and decrease in number of rows
Vapour compression
Vapour absorption
Carnot cycle
Electrolux refrigerator
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
Zero
20
50
100
Absolute
Relative
Specific
None of these
High pressure liquid refrigerant
Low pressure liquid and vapour refrigerant
Low pressure vapour refrigerant
None of these
Ammonia
Carbon dioxide
Sulphur dioxide
R-12
Ammonia vapour goes into solution
Ammonia vapour is driven out of solution
Lithium bromide mixes with ammonia
Weak solution mixes with strong solution
0.3
0.6
0.67
1.5
Less than 2 kg
More than or equal to 3.65 kg
More than 10 kg
There is no such consideration
Small displacements and low condensing pressures
Large displacements and high condensing pressures
Small displacements and high condensing pressures
Large displacements and low condensing pressures
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
Flooded
DX coil
Dry
None of these
Compressor
Condenser
Evaporator
Expansion valve
Wet bulb temperature
Relative humidity
Dry bulb temperature
Specific humidity
Is less than 1
Is more than 1
Is equal to 1
Depends upon the make
Non-toxic
Non-inflammable
Toxic and non-inflammable
Highly toxic and inflammable
21 kJ/min
210 kJ/min
420 kJ/min
620 kJ/min
Centrifugal
Axial
Miniature sealed unit
Piston type reciprocating
B.P.F. - 1
1 - B. P.F.
1/ B.P.F.
1 + B.P.F.
T₁/(T₂ - T₁)
(T₂ - T₁)/T₁
(T₁ - T₂)/T₁
T₂/(T₂ - T₁)
Iron
Lead
Aluminium
Rubber
Increases C.O.P
Decreases C.O.P
C.O.P remains unaltered
Other factors decide C.O.P
Copper
Aluminium
Steel
Brass
Wet bulb temperature
Relative humidity
Dry bulb temperature
Specific humidity
Constant pressure valve
Constant temperature valve
Constant superheat valve
None of these
Degree of superheat at exit from the evaporator
Temperature of the evaporator
Pressure in the evaporator
None of the above