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
None of these
Backward feed
High pressure

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Heat Transfer
Steam trap is used to

Stop the supply of steam
Condense the steam flowing in the pipeline
Remove water resulting from partial condensation of steam
None of these

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Heat Transfer
Nusselt number is the ratio of the

Temperature difference to the temperature gradient at the wall
Temperature gradient of the wall to that across the entire pipe
Heat flux at the wall to that across the entire pipe
None of these

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