Q. Emissivity of a body will be equal to its absorptivity at all temperatures.

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Q. Dehydration is the process of removing water vapour from the surrounding air.

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Q. The cooling of air, without any change in its specific humidity, is known as sensible cooling.

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Q. The capacity of the cooling tower and spray ponds __________ as the wet bulb temperature of air decreases.

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Q. A mixture of dry air and water vapour, when the air has diffused the maximum amount of water vapour into it, is called

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Q. The total pressure exerted by the mixture of air and water vapour is equal to the sum of pressures which each constituent would exert, if it occupied the same space by itself. This statement is called

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Q. The expansion valve in a refrigerator controls the flow of refrigerant.

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Q. Upto the critical radius of insulation,

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Q. The relative humidity lines on a psychrometric chart are

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Q. The C.O.P. of a heat pump working on a reversed Carnot cycle is

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Q. A vapour absorption refrigeration system

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

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Q. The dry bulb temperature lines, on the psychrometric chart are

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Q. The pressure at the outlet of a refrigerant compressor is called

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Q. A simple air cooling system is good for __________ flight speeds.

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Q. The highest temperature during the cycle in a vapour compression system occurs after evaporation.

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Q. The rato of energy transferred by convection to that by conduction is called

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Q. A refrigerating system operating on reversed Brayton refrigeration cycle is used for maintaining 250 K. If the temperature at the end of constant pressure cooling is 300 K and rise in the temperature of air in the refrigerator is 50 K, then the net work of compression will be (assume air as working substance with cp = 1 kJ/kg)

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Q. Wet bulb temperature indicates the moisture content in air.

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Q. A designer chooses the values of fluid flow rates and specific heats in such a manner that the heat capacities of the two fluids are equal. A hot fluid enters the counter flow heat exchanger at 100° C and leaves at 60° C. A cold fluid enters the heat exchanger at 40° C. The mean temperature difference between the two fluids is

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