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Heat Transfer

Heat Transfer
What is the steam economy in case of a single effect evaporator system?

< 1
1
0.1
>1

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Heat Transfer
If the thermal conductivity of a wall material is independent of temperature, the steady state temperature distribution in the very large thin plane wall having steady, uniform surface tempeature follows __________ law.

Linear
Hyperbolic
Parabolic
Logarithmic

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Heat Transfer
In case of a vertical tube evaporator, with increase in the liquor level, the

Both B and C
True temperature drop increases
Capacity of the evaporator is increased
Capacity of the evaporator is decreased

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Heat Transfer
Reynold's analogy states that

Nst α NRe
NRe α f
NNu α f
Nst α f

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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
The sum of reflectivity and absorptivity for an opaque body is equal to

1
2
0.5

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