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Heat Transfer

Heat Transfer
Viscous & heat sensitive liquids are concentrated in __________ evaporators.

Long tube
None of these
Open pan
Agitated film

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Heat Transfer
Heat transfer in the laminar sublayer in case of a liquid flowing through a pipe, is mostly by

Conduction
None of these
Eddies current
Convection

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Heat Transfer
Which is the most suitable for the concentration of foamy & frothy liquors?

Agitated film evaporator
None of these
Long tube vertical evaporator
Open pan evaporator

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Heat Transfer
Three solid objects of the same material and of equal mass-a sphere, a cylinder (length = diameter) and a cube are at 500°C initially. These are dropped in a quenching bath containing a large volume of cooling oil each attaining the bath temperature eventually. The time required for 90% change in temperature is the smallest for

Equal for all the three
Sphere
Cylinder
Cube

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

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Heat Transfer
To reduce the tube side pressure drop for the same flow rate, the heat exchanger recomended is

1-1 heat exchanger
2-4 heat exchanger
3-2 heat exchanger
1-2 heat exchanger

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