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Heat Transfer

Heat Transfer
The most conducive surface for dropwise condensation to occur is the __________ surface.

Glazed & polished
Coated
Smooth
Oily

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Heat Transfer
Thickness of thermal boundary layer is more compared to that of hydrodynamic boundary layer, when the value of Prandtl number is

> 5
1
> 1
< 1

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Heat Transfer
In thermal radiation for a black body (where, ε is emissivity and α is absorptivity)

α ≠ 1, ε ≠ 1
α = 1; ε = 1
α ≠ 1, ε = 1
α = 1; ε ≠ 1

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Heat Transfer
For condensation of pure vapors, if the heat transfer co-efficients in filmwise and drop-wise condensation are respectively hf and hd, then

hf = hd
hf > hd
hf could be greater or smaller than hd
hf < hd

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Heat Transfer
The Nusselt number for fully developed (both thermally and hydrodynamically) laminar flow through a circular pipe whose surface temperature remains constant is

88.66
3.66
Dependent on NRe only
1.66

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Heat Transfer
Which of the following has the minimum absorptivity?

Refractory bricks
Coal dust
Aluminium foil
Iron plates

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