Q. The refrigerant used in small-tonnage commercial machines (hermetically sealed units) is

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Q. In a vapour absorption refrigeration system, the compressor of the vapour compression system is replaced by

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Q. The absolute humidity is the mass of water vapour present in 1 m³ of dry air.

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Q. In a domestic refrigerator, a capillary tube controls the flow of refrigerant from the

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Q. Which of the following statement is wrong?

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Q. When the air is passed through an insulated chamber having sprays of water maintained at a temperature higher than the dew point temperature of entering air but lower than its dry bulb temperature, then the air is said to be

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Q. In a parallel flow heat exchanger, the rate of flow of heat and the rate of decrease of temperature are maximum.

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Q. A steam pipe is to be lined with two layers of insulating materials of different thermal conductivities. For the minimum heat transfer,

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Q. A condenser is used in the __________ pressure side of a refrigerating system.

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Q. The boiling point of R-12 is about - 30°C.

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Q. The overall coefficient of heat transfer is used in problems of

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Q. During sensible heating of air __________ decreases.

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Q. R-12 has the __________ freezing point.

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Q. The refrigerant after condensation process is cooled below the saturation temperature before throttling. Such a process is called

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Q. The process of undercooling is generally brought about by

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Q. The fluids used in electrolux refrigerator are

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Q. During heating and humidification, the final relative humidity of air

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Q. The specific humidity during cooling and dehumidification

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Q. The thermostatic expansion valve is also called

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Q. The process of heat transfer from one particle of the fluid to another by the actual movement of the fluid particles due to difference of density caused by temperature of the particle is known as

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