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Heat Transfer

Heat Transfer
Radiation energy is emitted by all the substances, which are above

none of the listed here
0°K
0°C
100°C

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Heat Transfer
In an interphase heat transfer process, the equilibrium state corresponds to equality of temperature in the two phases, while the condition for equilibrium in an interphase mass transfer process is equality of

Activity co-efficients
Mass transfer co-efficients
Chemical potentials
Concentrations

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

all of the listed here
black
white
coloured

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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 - εx . εy)
1/εx + 1/εy

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Heat Transfer
Double pipe heat exchangers are preferably useful, when

Requirement of heat transfer area is low
Overall heat transfer co-efficient is very high
High viscosity liquid is to be cooled
A corrosive liquid is to be heated

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Heat Transfer
Which of the following is concerned with both heat and mass transfer ?

Nusselt number
Lewis relationship
Kutateladze number
Froude number

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