Condenser and expansion valve
Compressor and evaporator
Expansion valve and evaporator
Compressor and condenser
C. Expansion valve and evaporator
1 m3 of wet air
1 m3 of dry air
1 kg of wet air
1 kg of dry air
More
Less
Equally
Unpredictable
Equalise
Reduce
Increase
None of these
High pressure saturated liquid
Wet vapour
Very wet vapour
Dry vapour
Ericson
Stirling
Carnot
Bell Coleman
Freezing coil
Cooling coil
Chilling coil
All of these
Same
Lower
Higher
None of these
Room sensible heat load only
Room latent heat load only
Both room sensible heat and latent heat loads
None of the above
Higher in winter than in summer
Lower in winter than in summer
Same in winter and summer
Not dependent on season
Positive
Negative
Zero
None of these
Simple air cooling system
Simple evaporative air cooling system
Bootstrap air cooling system
All of these
Isentropic compression process
Constant pressure cooling process
Isentropic expansion process
Constant pressure expansion process
Remains constant
Increases
Decreases
None of these
The performance of the vapour compression refrigerator varies considerably with both vaporising and condensing temperatures.
In vapour compression cycle, the useful part of the heat transfer is at the condenser.
In ammonia-hydrogen (Electrolux) refrigerator, no compressor, pump or fan is required.
The effect of under-cooling the liquid refrigerant is to decrease the coefficient of performance.
Always less than unity
Always more than unity
Equal to unity
Any one of the above
Saturation point of vapour
Saturation point of liquid
Sublimation temperature
Triple point
Carnot cycle
Rankines cycle
Reversed Carnot cycle
None of the above
Dry bulb temperature
Wet bulb temperature
Dew point temperature
Relative humidity
Is less than 1
Is more than 1
Is equal to 1
Depends upon the make
Rankine
Carnot
Reversed Rankine
Reversed Carnot
Relative humidity remains constant
Wet bulb temperature increases
Specific humidity increases
Partial pressure of vapour remains constant
-56.6°C
-75.2°C
-77.7°C
-135.8°C
5°C
8°C
14°C
22°C
20 to 50°C
50 to 70°C
70 to 110°C
None of these
Dry bulb depression
Wet bulb depression
Dew point depression
Degree of saturation
Same
Lower
Higher
None of these
Expansion valve to the evaporator
Evaporator to the thermostat
Condenser to the expansion valve
Condenser to the evaporator
Remains constant
Increases
Decreases
None of these
T₁/(T₂ - T₁)
(T₂ - T₁)/T₁
(T₁ - T₂)/T₁
T₂/(T₂ - T₁)
Suction pressure
Discharge pressure
Critical pressure
Back pressure