Heat Transfer, Refrigeration and Air Conditioning Questions

• 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
• The refrigerant supplied to a compressor must be
• 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.
• During sensible heating of air, specific humidity remains constant.
• Air refrigeration cycle is used in
• In electrolux refrigerator
• The wet bulb depression is zero when relative humidity is
• Which of the following statement is correct?
• A good refrigerant should have
• Dew point temperature corresponds to the saturation temperature of vapour at its partial pressure.
• The sensible heat during humidification process decreases.
• Which of the following refrigerant has the maximum ozone depletion potential in the stratophere?
• The unit of thermal diffusivity is
• In a boot-strap air evaporative cooling system, the evaporator is provided
• The ratio of Nusselt number and the product of Reynold's number and Prandtl number is equal to
• In a shell and coil condenser, water flows in the shell and the refrigerant in the coil.
• The condition of refrigerant after passing through the expansion or throttle valve, in a vapour compression system is
• In a vapour compression system, the condition of refrigerant before entering the expansion or throttle valve is
• The condition of refrigerant as it leaves the compressor in a vapour compression system is
• Which of the following statement is correct?