Simple air cooling system
Bootstrap air cooling system
Reduced ambient air cooling system
Regenerative air cooling system
D. Regenerative air cooling system
Does not alter C.O.P.
Increases C.O.P.
Decreases C.O.P.
None of these
Freon-11
Freon-22
CO2
Ammonia
One tonne is the total mass of machine
One tonne refrigerant is used
One tonne of water can be converted into ice
One tonne of ice when melts from and at 0° C in 24 hours, the refrigeration effect is equivalent to 210 kJ/min
Heated and dehumidified
Heated and humidified
Cooled and humidified
Cooled and dehumidified
One heat exchanger
Two heat exchangers
Three heat exchangers
Four heat exchangers
Does not alter C.O.P.
Increases C.O.P.
Decreases C.O.P.
None of these
Of cooling medium
Of freezing zone
Of evaporator
At which refrigerant gas becomes liquid
(hA - h2)/ (h1 - h2)
(h2 - hA)/ (h1 - h2)
(h1 - h2)/ (hA - h2)
(hA - h1)/ (h2 - h1)
Remains constant
Increases
Decreases
None of these
Equal to
Less than
Greater than
None of these
Equal to
Less than
More than
None of these
Condenser
Evaporator
Absorber
Condenser, absorber and separator (rectifier)
It is toxic to mucous membranes.
It requires large displacement per TR compared to fluoro carbons.
It reacts with copper and its alloys.
All of these
0.622 Pv/ (Pb - Pv)
μ/[1 - (1 - μ) (Ps/Pb)]
[Pv (Pb - Pd)]/ [Pd (Pb - Pv)]
None of these
Condensation of the refrigerant vapour
Evaporation of the refrigerant liquid
Compression of the refrigerant vapour
Metering of the refrigerant liquid
Heat supplied by the gas burner to the heat absorbed by the evaporator
Heat absorbed by the evaporator to the heat supplied by the gas burner
Heat supplied by the gas burner minus the heat absorbed by the evaporator to the heat supplied by the gas burner
Heat absorbed by the evaporator minus the heat supplied by the gas burner to the heat absorbed by the evaporator
Equal to
Less than
Greater than
None of these
More
Less
Equally
Unpredictable
(hA - h2)/ (h1 - h2)
(h2 - hA)/ (h1 - h2)
(h1 - h2)/ (hA - h2)
(hA - h1)/ (h2 - h1)
Vapour compression cycle
Vapour absorption cycle
Air refrigeration cycle
None of these
Single fluid
Two fluids
Three fluids
None of these
Low boiling point
High critical temperature
High latent heat of vaporisation
All of these
1 kW
2 kW
3 kW
4 kW
Absolute
Relative
Specific
None of these
R-11
R-12
R-22
Ammonia
High latent heat of vaporisation and low freezing point
High operating pressures and low freezing point
High specific volume and high latent heat of vaporisation
Low C.O.P. and low freezing point
Wet bulb temperature
Relative humidity
Dry bulb temperature
Specific humidity
Liquid pump
Generator
Absorber and generator
Absorber, generator and liquid pump
Halide torch which on detection produces greenish flame lighting
Sulphur sticks which on detection gives white smoke
Using reagents
Smelling
Ammonia
Carbon dioxide
Sulphur dioxide
R-12