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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Q. In free convection heat transfer transition from laminar to turbulent flow is governed by the critical value of the

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Q. In a refrigerating machine, heat rejected is __________ heat absorbed.

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Q. Free convection flow depends on

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Q. The critical pressure of a liquid is the pressure

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Q. Conduction is a process of heat transfer

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Q. Thermal diffusivity of a substance is

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Q. The sensible heat factor during the heating and humidification process is given by (where h1 = Enthalpy of air entering the heating coil, h2 = Enthalpy of air leaving the heating coil, and hA = Enthalpy of air at the end of humidification process)

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