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Heat and Mass Transfer

Heat and Mass Transfer
Unit of thermal conductivity in S.I. units is

W/m °K
J/m² sec
J/m °K sec
Option (B) and (C) above

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Heat and Mass Transfer
The transfer of heat by molecular collision is smallest in

Solids
Liquids
None of these
Gases

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Heat and Mass Transfer
Sensible heat factor is given by (where S.H. = Sensible heat, and L.H. = Latent heat)

(S.H + L.H) /S.H
S.H/(L.H - S.H)
(L.H - S.H)/S.H
S.H/(S.H + L.H)

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Heat and Mass Transfer
Thermal conductivity of water at 20°C is of the order of

0.23
0.1
0.42
0.51

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Heat and Mass Transfer
Which of the following is expected to have highest thermal conductivity?

Steam
Solid ice
Melting ice
Water

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Heat and Mass Transfer
Thermal conductivity of wood depends on

All of these
Moisture
Density
Temperature

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