During dehumidification process, __________ remains constant.
In a psychrometric chart, dew point temperature lines are horizontal and non-uniformly spaced.
The super-heating in a refrigeration cycle
When the temperature of the surrounding is higher than the temperature of the body, then the heat loss by convection from the body to the surrounding will be
One tonne of refrigeration (1TR) means that the heat removing capacity is
The freezing point of R-is
The freezing point of carbon dioxide is equal to boiling point of R-12.
Air refrigeration cycle is used in
The process of adding moisture to the air, without change in its dry bulb temperature, is known as humidification.
In a saturated air-water vapour mixture, the
Environmental protection agencies advice against the use of chloro-fluoro-carbon refrigerants since
The colour of the flame of halide torch, in case of leakage of freon refrigerant, will change to
A good refrigerant should have
The ratio of Nusselt number and the product of Reynold's number and Prandtl number is equal to
In electrolux refrigerator
A thermostatic expansion valve in a refrigeration system
The relative humidity lines on a psychrometric chart are
The cooling of air, without any change in its specific humidity, is known as sensible cooling.
A refrigerating system operating on reversed Brayton refrigeration cycle is used for maintainingK. If the temperature at the end of constant pressure cooling isK and rise in the temperature of air in the refrigerator isK, then the net work of compression will be (assume air as working substance with cp = 1 kJ/kg)
If the evaporator temperature is kept constant, the coefficient of performance of a refrigeration cycle __________ with the increase in condenser temperature.
The operating temperature of a cold storage is -C. The heat leakage from the surrounding iskW for the ambient temperature ofC. The actual C.O.P. of refrigeration plant used is one fourth that of ideal plant working between the same temperatures. The power required to drive the plant is
If a gas is to be liquified, its temperature must be
The operating pressure for refrigerating units using R-as a refrigerant is
The refrigerant supplied to a compressor must be
The condition of refrigerant as it leaves the compressor in a vapour compression system is
Reynolds number is the ratio of
In case of liquids and gases, the heat transfer takes place according to
Dew point temperature corresponds to the saturation temperature of vapour at its partial pressure.
When the lower temperature of a refrigerating machine is fixed, then the coefficient of performance can be improved by
The thermal diffusivity for gases is generally __________ those for liquids.