85001. The ratio of the energy absorbed by the body to the total energy falling on it, is called
85002. The coefficient of performance of a domestic refrigerator is __________ as compared to a domestic air-conditioner.
85003. The process of heat transfer from one particle of the body to another is called conduction, when the particles of the body
85004. The human body feels comfortable when the heat stored in the body is
85005. A Bell Coleman refrigerator working on dense air system as compared to open air system, for the same range of temperature, results in __________ power per tonne of refrigeration.
85006. The amount of heat flow through a body by conduction is
85007. A furnace is made of a red brick wall of thickness 0.5 m and conductivity 0.7 W/mK. For the same heat loss and temperature drop, this can be replaced by a layer of diatomite earth of conductivity 0.14 W/mK and thickness
85008. In a refrigeration system, the expansion device is connected between the
85009. The heat rejection factor (HRF) is given by
85010. Wein's law states that the wave length corresponding to __________ is proportional to the absolute temperature.
85011. In a domestic vapour compression refrigerator, the refrigerant commonly used is
85012. In order to cool and dehumidify a stream of moist air, it must be passed over the coil at a temperature
85013. The coefficient of performance of vapour compression refrigeration system is quite __________ as compared to air refrigeration system.
85014. In order to collect liquid refrigerant and to prevent it from going to a __________ , a device known as accumulator is used at the suction of compressor.
85015. Which of the following refrigerant has the lowest boiling point?
85016. During sensible cooling of air, the relative humidity increases.
85017. In actual air-conditioning applications for R-12 and R-22, and operating at a condenser temperature of 40° C and an evaporator temperature of 5° C, the heat rejection factor is about
85018. The undesireable property of a refrigerant is
85019. The dry bulb temperature during sensible heating of air
85020. Radiation is the process of heat transfer in which heat flows from a __________ , in a straight line, without affecting the intervening medium.
85021. The heating of air, without any change in its specific humidity, is known as sensible heating.
85022. 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
85023. The pressure at the inlet of a refrigerant compressor is called
85024. The process, generally used in summer air conditioning to cool and dehumidify the air, is called
85025. The leakage in a refrigeration system using ammonia is detected by
85026. The lowest temperature during the cycle in a vapour compression system occurs after
85027. The temperature of air recorded by a thermometer, when it is not effected by the moisture present in the air, is called
85028. A human body feels comfortable when the heat produced by the metabolism of human body is equal to the
85029. During sensible cooling,
85030. The wave length of the radiation emitted depends only on the temperature and is independent of the material of the body.
85031. The process of heat transfer from one particle of the body to another by the actual motion of the heated particles, is called
85032. In a domestic refrigerator, a capillary tube controls the flow of refrigerant from the
85033. The absolute humidity is the mass of water vapour present in 1 m3 of dry air.
85034. In a vapour absorption refrigeration system, the compressor of the vapour compression system is replaced by
85035. The refrigerant used in small-tonnage commercial machines (hermetically sealed units) is
85036. In a lithium bromide absorption refrigeration system
85037. A condenser is used in the __________ pressure side of a refrigerating system.
85038. A steam pipe is to be lined with two layers of insulating materials of different thermal conductivities. For the minimum heat transfer,
85039. In a parallel flow heat exchanger, the rate of flow of heat and the rate of decrease of temperature are maximum.
85040. When the air is passed through an insulated chamber having sprays of water maintained at a temperature higher than the dew point temperature of entering air but lower than its dry bulb temperature, then the air is said to be
85041. 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
85042. During heating and dehumidification process, dry bulb temperature
85043. A refrigerant compressor is used to
85044. In which of the following refrigeration system, waste heat can be effectively used?
85045. During heating and humidification, the final relative humidity of air
85046. The fluids used in electrolux refrigerator are
85047. The process of undercooling is generally brought about by
85048. The refrigerant after condensation process is cooled below the saturation temperature before throttling. Such a process is called
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