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Heat Transfer

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

Highly viscous
Salty
Scaling
Corrosive

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Heat Transfer
Increasing the liquor level in the evaporator results in the

decreased effect of hydrostatic head
increased true temperature drop
increase in liquor film co-efficient
decreased capacity

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Heat Transfer
The variation of thermal conductivity of a metal with temperature is often correlated using an expression of the form K = K₀ + at. where, K is the thermal conductivity and T is the temperature (in °K). The units of 'a' in SI system will be

W/m
W/m.k²
None, A is just a number
W/m.k

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Heat Transfer
Natural convection is characterised by

Grashhoff number
Peclet number
Prandtl number
Reynolds number

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Heat Transfer
The interchange factor for radiation heat transfer from surface 'x' to surface 'y' in case of an infinite parallel planes with emis-sivities εx & εy is given by

(εx + εy)/(εx + εy - εx . εy)
Εx . εy
1/εx + 1/εy
Εx + εy

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Heat Transfer
For __________ Prandtl number values, the heat conduction will be negligible in the buffer zone.

High
No
Low
Extremely low

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MORE MCQ ON Heat Transfer

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