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Heat Transfer

Heat Transfer
Viscous & heat sensitive liquids are concentrated in __________ evaporators.

Long tube
Open pan
None of these
Agitated film

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Heat Transfer
Dropwise condensation occurs on __________ surfaces

smooth clean
polished
contaminated cooling
clean and dirt free

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Heat Transfer
Critical value of the __________ number governs the transition from laminar to turbulent flow in free convection heat transfer.

Grashoff
Prandtl & Grashoff
Reynolds
Both A & B

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Heat Transfer
The overall heat transfer co-efficient for a shell and tube heat exchanger for clean surfaces is U0 = 400 W/m².K. The fouling factor after one year of operation is found to be hd0 = 2000 W/m².K. The overall heat transfer co-efficient at this time is

333W/m².K
287 W/m².K
894W/m².K
1200W/m².K

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Heat Transfer
Grashhoff number is given by

gD³βΔtP²/μ
gD2βΔtP²μ
gD2βΔtρ/μ²
gD³.β.Δtρ²/μ²

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Heat Transfer
The variation of thermal conductivity of a metal with temperature is often correlated using an expression of the form K = K₀ + at. where, K is the thermal conductivity and T is the temperature (in °K). The units of 'a' in SI system will be

None, A is just a number
W/m.k²
W/m
W/m.k

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