Non-toxic
Non-inflammable
Toxic and non-inflammable
Highly toxic and inflammable
D. Highly toxic and inflammable
Increases C.O.P
Decreases C.O.P
C.O.P remains unaltered
Other factors decide C.O.P
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
A refrigerant should have low latent heat
If operating temperature of system is low, then refrigerant with low boiling point should be used
Pre-cooling and sub-cooling bf refrigerant are same
Superheat and sensible heat of a refrigerant are same
More
Less
Equally
Unpredictable
Bigger
Smaller
Equal
Smaller/bigger depending on capacity
Low boiling point
High critical temperature
High latent heat of vaporisation
All of these
More
Less
Same
More for small capacity and less for high capacity
0.622 Pv / (Pb - Pv)
μ/[1 - (1 - μ) (Ps/Pb)]
[Pv (Pb - Pd)]/ [Pd (Pb - Pv)]
None of these
Carnot cycle
Rankines cycle
Reversed Carnot cycle
None of the above
Dry bulb depression
Wet bulb depression
Dew point depression
Degree of saturation
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
21 kJ/min
210 kJ/min
420 kJ/min
620 kJ/min
Centrifugal
Axial
Miniature sealed unit
Piston type reciprocating
Dry bulb temperature
Wet bulb temperature
Dew point temperature
Specific humidity
210 kJ/ min
21 kJ/ min
420 kJ/ min
840 kJ/ min
CO2
Freon-11
Freon-22
Air
Reciprocating
Rotating
Centrifugal
Screw
High pressure saturated liquid
Wet vapour
Very wet vapour
Dry vapour
Inflammable
Toxic
Non-inflammable and toxic
Nontoxic and non-inflammable
High risibility with oil
Low boiling point
Good electrical conductor
Large latent heat
Compressor and condenser
Condenser and receiver
Receiver and evaporator
Evaporator and compressor
1 m3 of wet air
1 m3 of dry air
1 kg of wet air
1 kg of dry air
After passing through the condenser
Before passing through the condenser
After passing through the expansion or throttle valve
Before entering the expansion valve
Above which liquid will remain liquid
Above which liquid becomes gas
Above which liquid becomes vapour
Above which liquid becomes solid
Small displacements and low condensing pressures
Large displacements and high condensing pressures
Small displacements and high condensing pressures
Large displacements and low condensing pressures
It has low operating pressures
It gives higher coefficient of performance
It is miscible with oil over large range of temperatures
All of the above
Equal to
Less than
Greater than
None of these
Colourless
Odourless
Non-flammable
All of these
Remains constant
Increases
Decreases
None of these
T₁ / (T₂ - T₁)
(T₂ - T₁)/T₁
(T₁ - T₂)/T₁
T₂/ (T₂ - T₁)