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HEAT TRANSFER

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

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

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Heat Transfer
For a liquid in laminar flow through a very long tube, when the exit fluid temperature approaches the wall temperature, the equation to be used is

Nu = Gz
Nu = Gz
Nu = 0.023 Re0.8 . Pr0.4
Nu = 2Gz0.5

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Heat Transfer
In case of a vertical tube evaporator, with increase in the liquor level, the

Capacity of the evaporator is decreased
Capacity of the evaporator is increased
True temperature drop increases
Both B and C

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Heat Transfer
For a perfectly transparent surface (like gases), the

All of these
Absorptivity = 0
Reflectivity = 0
Transmissivity = 1

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Heat Transfer
The units of resistance to heat transfer is

J.m⁻¹.K⁻¹
W⁻¹m²K
W.m⁻².K⁻¹
J.m⁻².K⁻¹

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