Q. Multiple effect evaporation is generally recommended, when the

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Q. The inside heat transfer co-efficient in case of turbulent flow of liquid in the tube side in a 1-2 shell and tube heat exchanger is increased by __________ times, when the number of tube passes is increased to 8.

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Q. __________ heat exchanger is the most suitable, when the temperature of shell side fluid is much higher than that of tube side.

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Q. The rate of heat transfer from a vertical plate by natural convection depends upon the temperature differences (ΔT) between wall and outside bulk. The proportionality is given as

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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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