Q. The variation of thermal conductivity of a metal with temperature is often correlated using an expression of the form K = K₀ + at. where, K is the thermal conductivity and T is the temperature (in °K). The units of 'a' in SI system will be

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Q. Film condensation is promoted on a/an __________ surface.

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Q. Dietus-Boelter equation cannot be used for molten metals mainly due to its very low

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Q. If Prandtl number is greater than the Schmidt number, then the

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Q. Which of the following accessories is provided in the vapor line of an evaporator for removing the entrained liquid ?

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Q. Rate of heat transfer by vaporisation from pools of water is affected by the

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Q. Multiple effect evaporators are commonly used in the manufacture of

P. Paper
Q. Superphosphate
R. Sugar
S. Fats

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Q. Which of the following has the highest thermal conductivity ?

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Q. For specified tube outside diameter, higher BWG means higher

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Q. Pick out the wrong statement.

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Q. In case of a vertical tube evaporator, with increase in the liquor level, the __________ is increased.

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Q. Electromagnetic radiations propagate in vacuum with a velocity of __________ metre/second.

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Q. Heat flux is the time rate of heat transfer per unit

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Q. Nusselt number (for forced convection heat transfer) is a function of the __________ number.

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Q. Pick out the wrong statement.

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Q. Which type of heat exchanger is preferred for heavy heat loads ?

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Q. Pick out the wrong statement.

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Q. While the total emissivity of a perfect black body is unity, the same for a real body is

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Q. In a multipass shell and tube heat exchanger, tube side return pressure loss is equal to __________ the velocity head.

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Q. For a given ambient air temperature with increase in the thickness of insulation of a hot cylinderical pipe, the rate of heat loss from the surface would

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