Q. In counter-current flow heat exchanger, the logarithmic temperature difference between the fluids is __________ as compared to parallel flow heat exchanger.

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Q. Environmental protection agencies advice against the use of chloro-fluoro-carbon refrigerants since

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Q. When the lower temperature of a refrigerating machine is fixed, then the coefficient of performance can be improved by

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Q. The refrigerant carbon dioxide is not widely used because of its __________ power require ments per tonne of refrigeration and high operating pressures.

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Q. The by-pass factor of a cooling coil decreases with

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Q. For unsaturated air, the dew point temperature is __________ wet bulb temperature.

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Q. During dehumidification process, __________ remains constant.

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Q. Pressure of water vapour is given by

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Q. The value of the wave length for maximum emissive power is given by

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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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