Q. Prandtl number (PN) is given by PN = μ.cp/k.

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Q. In a vapour compression system, the condition of refrigerant before passing through the condenser is

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Q. A composite slab has two layers of different materials with thermal conductivities k1 and k2. If each layer has the same thickness, then the equivalent thermal conductivity of the slab will be

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Q. The critical temperature is the temperature

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Q. The evaporator changes the low pressure liquid refrigerant from the expansion valve into

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Q. For air conditioning the operation theatre in a hospital, the percentage of outside air in the air supplied is

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Q. In case ofsensible cooling of air, the coil efficiency is given by

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Q. The cooling system used for supersonic aircrafts and rockets is

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Q. Which of the following statement is correct?

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Q. The desirable property of a refrigerant is

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Q. The humidification process, on the psychrometric chart is shown by

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Q. The colour of the flame of halide torch, in case of leakage of freon refrigerant, will change to

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Q. The ratio of actual mass of water vapour in a given volume of moist air to the mass of water vapour in the same volume of saturated air at the same temperature and pressure, is called

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Q. The transfer of heat by molecular collision is smallest in

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Q. During dehumidification process, the relative humidity

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Q. The space between the two walls of a thermos flask is evacuated because vacuum is a __________ conductor of heat.

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Q. The ratio of actual heat transfer to the maximum possible heat transfer is known as heat exchanger effectiveness.

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Q. The mass of water vapour present in 1 kg of dry air, is called humidity ratio.

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Q. In a vapour compression refrigeration system, a throttle valve is used in place of an expander because

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Q. The unit of overall coefficient of heat transfer is

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