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Heat Transfer

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

Corrosive
Salty
Highly viscous
Scaling

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Heat Transfer
When warm and cold liquids are mixed, the heat transfer is mainly by

convection
conduction
none of the listed here
radiation

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Heat Transfer
Steam traps are provided in steam carrying pipelines to

remove condensate and inert gases
condense steam
release excess steam pressure by bleeding steam.
none of the listed here

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Heat Transfer
Steam side heat transfer co-efficient in an evaporator is in the range of __________ kcal/hr.m²°C.

18537
100-500
5000-15000
1000-1500

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Heat Transfer
In counter flow compared to parallel flow,

Both A and B
Less surface area is required for a given heat transfer rate
LMTD is greater
More surface area is required for a given heat transfer rate

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Heat Transfer
For condensation of pure vapors, if the heat transfer co-efficients in filmwise and drop-wise condensation are respectively hf and hd, then

hf > hd
hf could be greater or smaller than hd
hf = hd
hf < hd

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