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Heat Transfer

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

Salty
Scaling
Corrosive
Highly viscous

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Heat Transfer
Which of the following is the most widely used heat insulating material for pipelines carrying steam?

Cotton followed by aluminium foil
Fireclay refractory followed by aluminium sheet
85% magnesia cement and glass wool
Tar dolomite bricks followed by asbestos

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Heat Transfer
In case of a vertical tube evaporator, with increase in the liquor level, the __________ is increased.

Liquor-film co-efficient
Both A and B
Neither A and B
Velocity of circulation

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Heat Transfer
Removal of __________ heat is involved in the condensation of a vapor under saturated conditions.

Both B & C
Latent
Super
Sensible

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Heat Transfer
When does the heat generated by fluid friction becomes appreciable compared to the heat transferred between the fluids?

At low velocity
When fluid flows past a smooth surface
At high fluid velocity
None of these

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Heat Transfer
The wavelength at which the maximum monochromatic emissive power occurs for a black body, is (where, T = absolute temperature of the black body)

α 1/T
α T⁴
Independent of T
αT

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