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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
Scaling
Corrosive

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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

Cylinder
Sphere
Equal for all the three
Cube

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Heat Transfer
Which of the following accessories is provided in the vapor line of an evaporator for removing the entrained liquid ?

Catchall
None of the listed here
Vent
Bleed point

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Heat Transfer
With increase in temperature, the thermal conductivity of non-metallic amorphous solids

remains same
increases
None of the listed here
decreases

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Heat Transfer
The unit of heat transfer co-efficient in SI unit is

W/m2°K
J/m°K
W/m°K
J/M2°K

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Heat Transfer
Which of the following is generally considered as opaque surface towards radiations?

Gases
Both solids & liquids
Solids
Liquids

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