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Heat Transfer

Heat Transfer
Value of Nusselt number [Nu = (hD/k)] for the heat transfer by conduction from a droplet or a spherical particle to a surrounding stagnant film is

100
2
10
0.5

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Heat Transfer
Fouling factor for a heat exchanger is given by (where, U₁ = heat transfer co-efficient of dirty surface U₂ = heat transfer co-efficient of clean surface)

U₂ - U₁
1/U₁ - 1/U₂
1/U₂ - 1/U₁
U₁ - U₂

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Heat Transfer
Pick out the correct equation.

JH = (St)1/3(Pr) = f/2
JH = (St)2/3(Pr) = f/2
JH = (St)(Pr)1/3 = f/2
JH = (St)(Pr)2/3 = f/2

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Heat Transfer
To reduce the tube side pressure drop for the same flow rate, the heat exchanger recomended is

3-2 heat exchanger
2-4 heat exchanger
1-2 heat exchanger
1-1 heat exchanger

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Heat Transfer
Correction is applied to LMTD for __________ flow.

None of these
Parallel
Counter
Cross

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Heat Transfer
Dropwise condensation occurs on __________ surfaces

smooth clean
polished
clean and dirt free
contaminated cooling

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MORE MCQ ON Heat Transfer

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