Heat Transfer, Refrigeration and Air Conditioning Questions

• Conduction is the process of heat transfer from one particle of the body to another by the actual motion of the heated particles.
• If the condenser temperature is kept constant, the coefficient of performance of a refrigeration cycle increases with the increase in evaporator temperature.
• When α is absorptivity, ρ is reflectivity and τ is transmittivity, then for a diathermanous body,
• The central air conditioning system has __________ overall efficiency as compared to individual systems.
• Logarithmic mean temperature difference is the same as the arithmetic mean temperature difference.
• A refrigerant with the highest critical pressure is
• The refrigerant used for absorption refrigerators working on heat from solar collectors is a mixture of water and
• The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body. This statement is known as
• The leakage in a refrigeration system using freon is detected by
• Most air cooled condensers are designed to operate with a temperature difference of
• A device used for transfering heat from one fluid to another is called heat exchanger.
• The relative humidity __________ as air gets drier.
• The product of Reynolds number and Prandtl number is known as
• The boiling point of ammonia is
• A Bell Coleman refrigerator working on dense air system as compared to open air system, for the same range of temperature, results in higher coefficient of performance.
• During humidification process, dry bulb temperature
• The condition of refrigerant after passing through the condenser in a vapour compression system is
• Fourier's law of heat conduction gives the heat flow for
• In a shell and tube heat exchanger, baffles are provided on the shell side to
• Dew point temperature is the temperature of air recorded by a thermometer, when the moisture present in it begins to condense.