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Heat Transfer

Heat Transfer
Minimum recommended baffle spacing in a shell and tube heat exchanger is about (where, D = shell diameter)

0.5 D
0.4 D
0.2 D
0.3 D

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Heat Transfer
In a shell and tube heat exchanger, floating head is used for

Large temperature differentials
High heat transfer co-efficient
Low pressure drop
Less corrosion of tubes

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Heat Transfer
A multiple effect evaporator has a capacity to process 4000 kg of solid caustic soda per day, when it is concentrating from 10% to 25% solids. The water evaporated in kg per day is

6000
48000
60000
24000

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Heat Transfer
A tank painted with which of the following coloured paints, would heat up maximum by radiation from sun?

White paint
Grey paint
Yellow paint
Black paint

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Heat Transfer
Heat waves

Can not pass through vacuum
Can be reflected by a mirror
Travel in straight line
Both B and C

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Heat Transfer
The characteristic dimensionless groups for heat transfer to a fluid flowing through a pipe in laminar flow are

Nu, Pr, Re
Nu, Pr
Re.Gz
Nu, Gz

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