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Heat Transfer

Heat Transfer
Value of Prandtl number for water ranges from

L to 2
1000 to 2000
100 to 500
5 to 10

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Heat Transfer
Which of the following is the most widely used heat insulating material for pipelines carrying steam?

Fireclay refractory followed by aluminium sheet
85% magnesia cement and glass wool
Cotton followed by aluminium foil
Tar dolomite bricks followed by asbestos

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Heat Transfer
The thermal boundary layer at NPr > 1

Is thinner than hydrodynamic boundary layer
And the hydrodynamic boundary layer are identical
Is thicker than hydrodynamic boundary layer
Disappears

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Heat Transfer
In Fourier's law, the proportionality constant is called the

Stefan-Boltzman constant
Heat transfer co-efficient
Thermal conductivity
Thermal diffusivity

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Heat Transfer
A measure of the extent to which viscous heating is important relative to the heat flow resulting from the impressed temperature difference is represented by the __________ number.

Stantan
Grashoff
Brinkman
Condensation

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Heat Transfer
If the thermal conductivity of a wall material is independent of temperature, the steady state temperature distribution in the very large thin plane wall having steady, uniform surface tempeature follows __________ law.

Linear
Logarithmic
Hyperbolic
Parabolic

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