Q. The temperature rise, between the condenser outlet and expansion valve in ammonia vapour compression system, should be as low as possible.

View solution

Q. The ratio of the actual mass of water vapour in a unit mass of dry air to the mass of water vapour in the same mass of dry air when it is saturated at the same temperature and pressure, is called

View solution

Q. The __________ point of ammonia is -77.7°C.

View solution

Q. Sulphur dioxide has the lowest boiling point.

View solution

Q. For a given dry bulb temperature, as the relative humidity __________ the wet bulb temperature will increase.

View solution

Q. The lowest thermal diffusivity is of

View solution

Q. A low wet bulb temperature indicates very __________ humidity.

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

Q. During dehumidification process, __________ remains constant.

View solution

Q. Pressure of water vapour is given by

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution