Q. In a domestic vapour compression refrigerator, the refrigerant commonly used is

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Q. In case of sensible heating of air, the coil efficiency is given by (where B.P.F. = By-pass factor)

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Q. The coefficient of performance (C.O.P.) is the reciprocal of the efficiency of a heat engine.

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Q. The wet bulb temperature at 100% relative humidity is __________ dry bulb temperature.

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Q. The freezing point of sulphur dioxide is

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Q. The ratio of the energy absorbed by the body to the total energy falling on it, is called

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Q. In order to cool and dehumidify a stream of moist air, it must be passed over the coil at a temperature

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Q. The coefficient of performance of vapour compression refrigeration system is quite __________ as compared to air refrigeration system.

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Q. 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.

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Q. Which of the following refrigerant has the lowest boiling point?

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Q. During sensible cooling of air, the relative humidity increases.

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Q. Sensible heat factor is given by (where S.H. = Sensible heat, and L.H. = Latent heat)

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Q. Stefan-Boltzmann law is applicable for heat transfer by convection.

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Q. The most commonly used method for the design of duct size is the

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Q. In counter-current flow heat exchangers

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Q. The rate of heat flow through a body is . The term x/kA is known as

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Q. 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

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Q. The undesireable property of a refrigerant is

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Q. The dry bulb temperature during sensible heating of air

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Q. Radiation is the process of heat transfer in which heat flows from a __________ , in a straight line, without affecting the intervening medium.

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