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Heat Transfer

Heat Transfer
At what value of Prandtl number, conduction is negligible in the turbulent core of a fluid flowing through a heated pipe?

> 0.6
< 0.5
0.5
< 0.1

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Heat Transfer
Black liquor generated during paper manufacture is concentrated in a

multiple effect evaporator
single effect evaporator followed by a crystalliser
multiple effect evaporators followed by a crystalliser
single effect evaporator

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Heat Transfer
In case of a multipass shell and tube heat exchanger, providing a baffle on the shell side __________ the heat transfer rate.

Increases
Does not affect
Decreases
May increase or decrease, depends on the type of baffle

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Heat Transfer
Heat transfer rate per unit area is called

heat transfer co-efficient
heat flux
thermal diffusivity
thermal conductivity

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Heat Transfer
In a single evaporator system, the steam economy __________ by creating vacuum in the evaporator.

May increase or decrease, depends on the vacuum
Remains constant
Increases
Decreases

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Heat Transfer
The purpose of providing a 'catchall' in the vapor line of an evaporator is to

Create vacuum
Vent the non-condensible gases
Regulate the vapor flow
Arrest the entrained liquid

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