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Heat Transfer

Heat Transfer
Open pan evaporators are preferred to be used, when the solution to be concentrated is

Salty
Highly viscous
Corrosive
Scaling

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

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

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Heat Transfer
The actual temperature drop across the heating surface of an evaporator depends on the

Solution being evaporated
Liquid depth over the heating surface
Pressure difference between the steam chest and the vapor space above the boiling liquid
All of these

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Heat Transfer
When vaporisation takes place through a blanketting film of gas, the phenomenon is termed as __________ boiling.

none of the listed here
transition
film
pool

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Heat Transfer
Which of the following parameters is increased by use of finned tube in a multipass shell and tube heat exchanger?

Tube side pressure drop and the heat transfer rate
Effective tube surface area for convective heat transfer
Convective heat transfer co-efficient
All of these

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Heat Transfer
With increase in temperature, the thermal conductivity of steel

Remains unchanged
Increases
Increases exponentially
Decreases

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MORE MCQ ON Heat Transfer

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