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Heat Transfer

Heat Transfer
For what value of Prandtl number, St = f/2?

1
> 1
2
1.5

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Heat Transfer
At what value of Prandtl number, the hydrodynamic and thermal boundary layers of a fluid flowing over a heated plate will be identical?

< 1
1
None of these
> 1

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Heat Transfer
At constant temperature, the thermal conductivities of gases __________ with rise in pressure.

Decrease
Increase
May increase or decrease; depends on the pressure
Remain unchanged

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Heat Transfer
Multiple effect evaporators are commonly used in the manufacture of P. Paper Q. Superphosphate R. Sugar S. Fats

P and S
P and R
P and Q
R and S

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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
Arrest the entrained liquid
Regulate the vapor flow

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Heat Transfer
Which of the following is not concerned with the heat transfer?

Schmidt number
Stanton number
Brinkman number
Peclet number

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