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Heat Transfer

Heat Transfer
Stefen's block body radiation law can also be derived from __________ law.

Fourier's
Kirchoffs
None of these
Planck's

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Heat Transfer
Steam side heat transfer co-efficient in an evaporator is in the range of __________ kcal/hr.m²°C.

5000-15000
18537
100-500
1000-1500

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Heat Transfer
A composite flat wall of a furnace is made of two materials 'A' and 'B'. The thermal conductivity of 'A' is twice of that of material 'B', while the thickness of layer of 'A' is half that of B. If the temperature at the two sides of the wall are 400 and 1200°K, then the temperature drop (in °K) across the layer of material 'A' is

133
125
160
150

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Heat Transfer
For a multipass shell and tube heat exchanger, the LMTD correction factor is always

1
> 1
< 1
Between 1 & 2

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Heat Transfer
An evaporator while concentrating an aqueous solution from 10 to 40% solids evaporates 30000 kg of water. The amount of solids handled by the system in kg is

4000
9000
3000
4600

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Heat Transfer
__________ equation relates the thermal conductivity of a solid to its temperature.

Lee's
Kopp's
Antonie
Kistyakowski

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