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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
If the evaporator temperature of a plant is lowered, keeping the condenser temperature constant, the h.p. of compressor required will be

Same
More
More/less depending on rating
Less

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Refrigeration and Air Conditioning
During sensible heating of air _________ decreases.

Relative humidity
Dry bulb temperature
Wet bulb temperature
Specific humidity

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Refrigeration and Air Conditioning
The dehumidification process, on the psychrometric chart, is shown by

Horizontal line
Inclined line
Vertical line
Curved line

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Refrigeration and Air Conditioning
The comfort conditions in air conditioning are at (where DBT = Dry bulb temperature, and RH = Relative humidity)

22°C DBT and 60% RH
20°C DBT and 80% RH
25°C DBT and 40% RH
25°C DBT and 100% RH

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Refrigeration and Air Conditioning
R-12 is generally preferred over R-22 in deep freezers since

It is miscible with oil over large range of temperatures
It gives higher coefficient of performance
All of these
It has low operating pressures

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Refrigeration and Air Conditioning
The C.O.P. of a heat pump working on a reversed Carnot cycle is

T₂/(T₂ - T₁)
T₁/(T₂ - T₁)
(T₁ - T₂)/T₁
(T₂ - T₁)/T₁

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MORE MCQ ON Refrigeration and Air Conditioning

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