Q. A steam pipe is to be lined with two layers of insulating materials of different thermal conductivities. For the minimum heat transfer,

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Q. In a parallel flow heat exchanger, the rate of flow of heat and the rate of decrease of temperature are maximum.

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Q. 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

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Q. Which of the following statement is wrong?

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Q. In a domestic refrigerator, a capillary tube controls the flow of refrigerant from the

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Q. The absolute humidity is the mass of water vapour present in 1 m³ of dry air.

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Q. In a vapour absorption refrigeration system, the compressor of the vapour compression system is replaced by

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Q. The refrigerant used in small-tonnage commercial machines (hermetically sealed units) is

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Q. In a lithium bromide absorption refrigeration system

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Q. 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

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Q. The pressure at the inlet of a refrigerant compressor is called

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Q. The process, generally used in summer air conditioning to cool and dehumidify the air, is called

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Q. The leakage in a refrigeration system using ammonia is detected by

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Q. The lowest temperature during the cycle in a vapour compression system occurs after

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Q. Which of the following represents a heat pump?

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Q. 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

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