Results in loss of heat due to poor heat transfer
Increases heat transfer rate
Is immaterial
Can be avoided by proper design
A. Results in loss of heat due to poor heat transfer
Positive
Negative
Zero
None of these
Water
Ammonia
Freon
Aqua-ammonia
After passing through the condenser
Before passing through the condenser
After passing through the expansion or throttle valve
Before entering the compressor
Wet bulb temperature
Relative humidity
Dry bulb temperature
Specific humidity
Kinetic theory of gases
Newton's law of gases
Dalton's law of partial pressures
Avogadro's hypothesis
Ammonia
Carbon dioxide
Sulphur dioxide
R-12
50 kcal/ min
50 kcal/ hr
80 kcal/ min
80 kcal/ hr
Sub-cooling or under-cooling
Super-cooling
Normal cooling
None of these
Increases C.O.P
Decreases C.O.P
C.O.P remains unaltered
Other factors decide C.O.P
Dry bulb temperature
Wet bulb temperature
Dew point temperature
Relative humidity
B.P.F. - 1
1 - B.P.F.
1/ B.P.F.
1 + B.P.F.
Remains constant
Increases
Decreases
None of these
Can be lower or higher than that of the entering air
Is lower than that of the entering air
Is higher than that of the entering air
None of the above
The value of C.O.P. is always greater than one.
In a vapour compression system, the condition of refrigerant before entering the compressor is dry saturated vapour.
The space between the saturated liquid line and saturated vapour line, in a pressure enthalpy chart, is wet vapour region.
None of the above
NN = hl/k
NN = μ cp/k
NN = ρ V l /μ
NN = V²/t.cp
Raise the pressure of the refrigerant
Raise the temperature of the refrigerant
Circulate the refrigerant through the refrigerating system
All of the above
100°C
50°C
33.3°C
0°C
Condenser
Evaporator
Absorber
None of these
Ammonia vapour goes into solution
Ammonia vapour is driven out of solution
Lithium bromide mixes with ammonia
Weak solution mixes with strong solution
(C.O.P.)P = (C.O.P.)R + 2
(C.O.P.)P = (C.O.P.)R + 1
(C.O.P)P = (C.O.P)R - 1
(C.O.P)P = (C.O.P)R
Humidity ratio
Relative humidity
Absolute humidity
Degree of saturation
Same
Lower
Higher
None of these
Reversed Carnot cycle
Reversed Joule cycle
Reversed Brayton cycle
Reversed Otto cycle
1 : 1
1 : 9
9 : 1
1 : 3
Remains constant
Increases
Decreases
None of these
Automatic expansion valve
High side float valve
Thermostatic expansion valve
Low side float valve
Condensation of the refrigerant vapour
Evaporation of the refrigerant liquid
Compression of the refrigerant vapour
Metering of the refrigerant liquid
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
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
Reciprocating
Rotating
Centrifugal
Screw