Q. If air (a non-condensing gas) is present in a condensing vapor stream, it will __________ the condensation rate of vapor.

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Q. Prandtl and Reynold's analogies are identical for Prandtl number value of

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Q. The outlet temperature of cooling water in a heat exchanger is generally not allowed to exceed above 50°C in industrial practice mainly to avoid

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Q. In evaporators, lowering the feed temperature

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Q. Unsteady state heat conduction occurs, when

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Q. What is the absorptivity of a black body ?

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Q. Mode of heat transfer in which the fluid moves under the influence of changes in fluid pressure produced by external work is called

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Q. Baffle spacing

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Q. Boiling point elevation of a solution of NaOH

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Q. Absorptivity of a perfect black body is unity. Which of the following has maximum absorptivity ?

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Q. At what value of Prandtl number, the hydrodynamic and thermal boundary layers of a fluid flowing over a heated plate will be identical ?

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Q. Fourier's law of heat conduction applies to __________ surfaces.

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Q. __________ chart is known as transient heat conduction chart.

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Q. In which mode of heat transfer, the Biot number is important ?

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Q. __________ paint has the minimum absorption co-efficient.

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Q. Asymptotic conditions is reached, when for a fluid flowing in laminar flow through a long tube

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Q. 1000 kg of wet solids are to be dried from 60% to 20% moisture (by weight). The mass of moisture removed in kg is

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Q. Which is the most suitable for the con-certration of highly concentrated solution?

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Q. The purpose of floating head in a heat exchanger is to

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Q. 1000 Kg of liquid at 30°C in a well stirred vessel has to be heated to 120°C, using immersed coils carrying condensing steam at 150°C. The area of the steam coils is 1.2 m² and the overall heat transfer co-efficient to the liquid is 1500 W/m².°C. Assuming negligible heat loss to the surrounding and specific heat capacity of the liquid to be 4 kJ/kg.°C, the time taken for the liquid to reach desired temperature will be

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