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Heat Transfer

Heat Transfer
Duhring rule is important in solving problems on

Distillation
Evaporation
Humidification
Crystallisation

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Heat Transfer
Heat transfer by conduction in the turbulent core of a fluid flowing through a heated pipe is negligible, if the value of Prandtl number is

0.8
0.4
0.2
0.6

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Heat Transfer
What is the unit of thermal conductivity ?

Kcal/hr.m
Kcal/hr. °C
Kcal/hr. m² °C
Kcal/hr.m.°C

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Heat Transfer
With the increase of temperature, the Col-burn jH factor

May increase or decrease ; depending on temperature
Increases
Remains unchanged
Decreases

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Heat Transfer
Among liquids, water has a comparatively high value of thermal conductivity, due to its

Partial ionisation
Low density
High viscosity
Dense structure

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Heat Transfer
For concentrating an aqueous solution of a material like anhydrous Na₂SO₄, whose solubility decreases with rise in temperature, the most suitable evaporator is a __________ evaporator.

Vacuum
Backward feed
None of these
High pressure

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