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
C. 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.
Centrifugal
Axial
Miniature sealed unit
Piston type reciprocating
Lithium bromide is used as a refrigerant and water as an absorbent
Water is used as a refrigerant and lithium bromide as an absorbent
Ammonia is used as a refrigerant and lithium bromide as an absorbent
None of the above
Bigger
Smaller
Equal
Smaller/bigger depending on capacity
Expansion valve to the evaporator
Evaporator to the thermostat
Condenser to the expansion valve
Condenser to the evaporator
More
Less
Equally
Unpredictable
Rankine
Carnot
Reversed Rankine
Reversed Carnot
Increased to a value above its critical temperature
Reduced to a value below its critical temperature
Equal to critical temperature
None of the above
1 kW
2 kW
3 kW
4 kW
Superheated vapour refrigerant
Dry saturated liquid refrigerant
A mixture of liquid and vapour refrigerant
None of these
3.5/C.O.P.
C.O.P/3.5
3.5 × C.O.P.
None of these
T₁/(T₂ - T₁)
(T₂ - T₁)/T₁
(T₁ - T₂)/T₁
T₂/(T₂ - T₁)
Ammonia
Carbon dioxide
Sulphur dioxide
R-12
Higher in winter than in summer
Lower in winter than in summer
Same in winter and summer
Not dependent on season
Ammonia
Carbon dioxide
Freon
Brine
20 to 50°C
50 to 70°C
70 to 110°C
None of these
Carnot cycle
Reversed Carnot cycle
Rankines cycle
Brayton cycle
Remains constant
Increases
Decreases
None of these
2 bar
8 bar
15 bar
30 bar
Vapour compression
Vapour absorption
Carnot cycle
Electrolux refrigerator
Removes heat from a low temperature body and delivers it to a high temperature body
Removes heat from a high temperature body and delivers it to a low temperature body
Rejects energy to a low temperature body
None of the above
Wet bulb temperature
Relative humidity
Dry bulb temperature
Specific humidity
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
Equal to
Less than
Greater than
None of these
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
50 kcal/ min
50 kcal/ hr
80 kcal/ min
80 kcal/ hr
Small displacements and low condensing pressures
Large displacements and high condensing pressures
Small displacements and high condensing pressures
Large displacements and low condensing pressures
(hA - h2)/ (h1 - h2)
(h2 - hA)/ (h1 - h2)
(h1 - h2)/ (hA - h2)
(hA - h1)/ (h2 - h1)
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
Liquid pump
Generator
Absorber and generator
Absorber, generator and liquid pump
The standard unit used in refrigeration problems
The cooling effect produced by melting 1 ton of ice
The refrigeration effect to freeze 1 ton of water at 0°C into ice at 0°C in 24 hours
The refrigeration effect to produce 1 ton of ice at NTP conditions