Refrigeration & Air Conditioning – HI MCQ!

The critical pressure of a liquid is the pressure?

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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, is called?

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Dry bulb temperature is the temperature of air recorded by a thermometer, when?

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The evaporator used in house-hold refrigerators is?

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The capillary tube is not used in large capacity refrigeration systems because?

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A valve which maintains a constant degree of superheat at the end of the evaporator called?

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If a gas is to be liquified, its temperature must be?

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The critical temperature is the temperature?

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In larger industrial and commercial reciprocating compression systems, refrigerent widely used is?

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Kirchhoff’s law states that?

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the total radiation from a black body per second per unit area is directly proportional to the fourth power of the absolute temperature
the wave length corresponding to the maximum energy is proportional to the absolute temperature
the ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body
none of the above