A grey body is one whose absorptivity does not vary with temperature and wave length of the incident ray.
The wet bulb temperature during sensible cooling of air
The superheated vapour region, in a pressure enthalpy chart, is represented by the space
Which of the following refrigerant has the maximum ozone depletion potential in the stratophere?
The C.O.P. of a Carnot refrigerator in winter will be __________ as compared to C.O.P. in summer.
A boot-strap air cooling system has
The thermostatic expansion valve operates on the changes in the
The sensible heat during humidification process decreases.
Thermal conductivity of a material may be defined as the
The desirable property of a refrigerant is
In a boot-strap air evaporative cooling system, the evaporator is provided
In absorption vapour systems, the refrigerant widely used is R-12.
The minimum temperature to which water can be cooled in a cooling tower is
Which of the following statement is correct?
The boiling point of __________ is -10.5°C.
In a vapour compression system, the condition of refrigerant before entering the expansion or throttle valve is
According to Newton's law of cooling, the heat transfer from a hot body to a cold body is
During sensible heating of air, specific humidity remains constant.
The condition of refrigerant after passing through the expansion or throttle valve, in a vapour compression system is
In a shell and coil condenser, water flows in the shell and the refrigerant in the coil.
In counter-current flow heat exchanger, the logarithmic temperature difference between the fluids is __________ as compared to parallel flow heat exchanger.
The humidification process, on the psychrometric chart is shown by
According to Stefan-Boltzmann law, the total radiation from a black body per second per unit area is directly proportional to the
Hydrogen is used in electrolux refrigeration system so as to __________ the rate of evaporation of the liquid ammonia passing through the evaporator.
The index which corelates the combined effects of air temperature, relative humidity and air velocity on the human body, is known as
According to Stefan's law, the total radiation from a black body per second per unit area is directly proportional to the fourth power of the absolute temperature.
The heat is transferred by conduction, convection and radiation in
The expansion valve in a refrigerator controls the flow of refrigerant.
Dehydration is the process of removing water vapour from the surrounding air.
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