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Heat Transfer

Heat Transfer
Planck's distribution law is valid for __________ bodies

all of the listed here
black
white
coloured

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Heat Transfer
For large heat transfer area requirement, shell and tube heat exchanger is preferred, because it

Is more economical
All of these
Is easy to operate and maintain
Occupies smaller space

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Heat Transfer
Fresh orange juice contains 12% (by weight) solids and the rest water 90% of the fresh juice is sent to an evaporator to remove water and subsequently mixed with the remaining 10% of fresh juice. The resultant product contains 40% solids. The kg of water removed from 1 kg fresh juice is

0.4
0.7
0.5
0.6

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Heat Transfer
Heat transfer rate per unit area is called

thermal diffusivity
heat transfer co-efficient
heat flux
thermal conductivity

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Heat Transfer
Graetz number is given by

mCp/kL
kμ/mCp
mCp/kμ
kL/mCp

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Heat Transfer
In SI units, fouling factor is expressed in

m²°K/W
W/m²°K
m²°K
m°K/W

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