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
A. It is not affected by the moisture present in the air
Equal to
Less than
Greater 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
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
Positive
Negative
Zero
None of these
1 : 1
1 : 9
9 : 1
1 : 3
1.33
2.33
3.33
4.33
Before entering the compressor
After leaving the compressor
Before entering the condenser
After leaving the condenser
Water
Ammonia
Freon
Aqua-ammonia
Reduce compressor overheating
Reduce compressor discharge temperature
Increase cooling effect
Ensure that only liquid and not the vapour enters the expansion (throttling) valve
Ammonia vapour goes into solution
Ammonia vapour is driven out of solution
Lithium bromide mixes with ammonia
Weak solution mixes with strong solution
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
5°C
8°C
14°C
22°C
Single fluid
Two fluids
Three fluids
None of these
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
Always less than unity
Always more than unity
Equal to unity
Any one of the above
0.376
0.4
0.6
0.67
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
Freezing at the expansion valve
Restriction to refrigerant flow
Corrosion of steel plates
All of these
Carnot cycle
Reversed Carnot cycle
Rankines cycle
Brayton cycle
Simple air cooling system
Bootstrap air cooling system
Reduced ambient air cooling system
Regenerative air cooling system
Remains constant
Increases
Decreases
None of these
Higher in winter than in summer
Lower in winter than in summer
Same in winter and summer
Not dependent on season
Humidity ratio
Relative humidity
Absolute humidity
Degree of saturation
[T₁ (T₂ - T₃)] / [T₃ (T₁ - T₂)]
[T₃ (T₁ - T₂)]/ [T₁ (T₂ - T₃)]
[T₁ (T₁ - T₂)] / [T₃ (T₂ - T₃)]
[T₃ (T₂ - T₃)] / [T₁ (T₁ - T₂)]
Small displacements and low condensing pressures
Large displacements and high condensing pressures
Small displacements and high condensing pressures
Large displacements and low condensing pressures
The constant enthalpy lines are also constant wet bulb temperature lines.
The wet bulb and dry bulb temperature are equal at saturation condition.
The wet bulb temperature is a measure of enthalpy of moist air.
All of the above
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
Does not alter C.O.P.
Increases C.O.P.
Decreases C.O.P.
None of these
Bigger cabinet should be used
Smaller cabinet should be used
Perfectly tight vapour seal should be used
Refrigerant with lower evaporation temperature should be used