Q. The operating pressure for refrigerating units using R-12 as a refrigerant is

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Q. The specific humidity during heating and humidification process.

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Q. According to Prevost's theory of exchanges, every body irrespective of its temperature continuously emit heat radiations to the surrounding bodies and at the same time receives heat radiations from the surrounding bodies.

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Q. In a boot-strap air evaporative cooling system, the evaporator is provided

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Q. According to Stefan-Boltzmann law, the total radiation from a black body per second per unit area is directly proportional to the

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Q. A good refrigerant should have

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Q. The thermal diffusivity for gases is generally __________ those for liquids.

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Q. In a shell and coil condenser, water flows in the shell and the refrigerant in the coil.

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Q. In a saturated air-water vapour mixture, the

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Q. Dew point temperature corresponds to the saturation temperature of vapour at its partial pressure.

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

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Q. The ratio of emissive power of a body to the emissive power of a perfectly black body is called emissivity.

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Q. The thermostatic expansion valve operates on the changes in the

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Q. In a vapour compression system, the condition of refrigerant before entering the expansion or throttle valve is

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Q. The freezing point of R-12 is

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Q. The refrigerant supplied to a compressor must be

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Q. The unit of thermal diffusivity is

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Q. The superheated vapour region, in a pressure enthalpy chart, is represented by the space

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Q. The minimum temperature to which water can be cooled in a cooling tower is

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Q. The index which corelates the combined effects of air temperature, relative humidity and air velocity on the human body, is known as

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