Q. For ammonia refrigerating systems, the tubes of a shell and tube condenser are made of

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Q. The highest thermal diffusivity is of

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Q. While designing the refrigeration system of an aircraft, the prime consideration is that the

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Q. The heat transfer takes place according to

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Q. An electrolux refrigerator is called a __________ absorption system.

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Q. The heat transfer by radiation __________ a medium.

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Q. Thermal conductivity of water __________ with rise in temperature.

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Q. The critical radius is the insulation radius at which the resistance to heat flow is

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Q. In case of solids, the heat transfer takes place according to radiation.

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Q. A water cooled condenser operates at a __________ condensing temperature than an air-cooled condenser.

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Q. The relative humidity decreases as air gets wet.

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Q. The temperature of ammonia after compression in a vapour compression system is

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Q. During adiabatic saturation process on unsaturated air __________ remains constant.

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Q. The thickness of thermal and hydrodynamic boundary layer is equal if Prandtl number is

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Q. A perfect black body is one which

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Q. Degree of saturation or percentage humidity is

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Q. The coefficient of performance of Heat Pump is always __________ one.

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Q. The wet bulb temperature during sensible heating of air

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Q. The C.O.P. of an absorption type refrigerator is given by (where T1 = Temperature at which the working substance receives heat, T2 = Temperature of cooling water, and T3 = Evaporator temperature)

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Q. Which of the following statement is wrong?

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