Heat Transfer, Refrigeration and Air Conditioning Questions

• The temperature of air recorded by a thermometer, when it is not effected by the moisture present in the air, is called
• The wave length of the radiation emitted depends only on the temperature and is independent of the material of the body.
• A condenser is used in the __________ pressure side of a refrigerating system.
• The temperature of air recorded by a thermometer, when the moisture present in it begins to condense, is called wet bulb temperature.
• In figure shown, E is a heat engine with efficiency of 0.4 and R is a refrigerator. It is given that Q2 + Q4 = 3Q1. The C.O.P. of the refrigerator is
• The leakage in a refrigeration system using ammonia is detected by
• During sensible cooling,
• The specific humidity during cooling and dehumidification
• A human body feels comfortable when the heat produced by the metabolism of human body is equal to the
• During heating and humidification, the final relative humidity of air
• The overall coefficient of heat transfer is used in problems of
• The fluids used in electrolux refrigerator are
• The refrigerant after condensation process is cooled below the saturation temperature before throttling. Such a process is called
• In a parallel flow heat exchanger, the rate of flow of heat and the rate of decrease of temperature are maximum.
• The boiling point of R-12 is about - 30°C.
• It is desired to condition the outside air from 70% relative humidity and 45° C dry bulb temperature to 50% relative humidity and 25° C dry bulb temperature (room condition). The practical arrangement will be
• The heat transfer from a hot body to a cold body is directly proportional to the surface area and difference of temperatures between the two bodies. This statement is called
• The absolute humidity is the mass of water vapour present in 1 m3 of dry air.
• In a lithium bromide absorption refrigeration system
• The thermostatic expansion valve is also called