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Heat Transfer

Heat Transfer
1 BTU/hr.ft.°F is equal to __________ kcal/hr. m.°C.

1.49
1
None of these
4.88

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Heat Transfer
Thermal conductivities of most of the liquids __________ with rise in temperature.

Decreases
Increases
Remains unchanged
May increase or decrease; depends on the liquid

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Heat Transfer
Economy of a multiple effect evaporator is not influenced much by the

rate of heat transfer
temperature of the feed
ratio of the weight of the thin liquor to thick liquor
boiling point elevations

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Heat Transfer
The separation of liquid droplets from the vapor is done by a/an __________ , in the evaporators.

Steam ejector
Compressor
Vacuum pump
Entrainment separator

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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.

Backward feed
None of these
High pressure
Vacuum

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Heat Transfer
Planck's distribution law is valid for __________ bodies

coloured
all of the listed here
white
black

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