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Heat and Mass Transfer

Heat and Mass Transfer
The critical thickness of insulation for a sphere is

2k/h₀
h₀/k
h₀/2k
k/h₀

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

None of these
Solids
Gases
Liquids

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

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Heat and Mass Transfer
Depending on the radiating properties, a body will be white when (Where a = absorptivity, p = reflectivity, x = transmissivity)

P = 0, x = 0 and a = 1
P=1, T = 0 and a = 0
X = 0, a + p = 1
P = 0, x = 1 and a = 0

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Heat and Mass Transfer
The product of Reynolds number and Prandtl number is known as

Biot number
Peclet number
Stanton number
Grashoff number

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Heat and Mass Transfer
Depending on the radiating properties, a body will be opaque when

P=1, x = 0 and a = 0
P = 0, x = 0 and a = 1
X = 0, a + p = 1
P = 0, x = 1 and a = 0

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