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Heat Transfer

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

Open pan
None of these
Long tube
Agitated film

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Heat Transfer
The equation, Nst = f/2, is the __________ analogy.

Reynolds
Prandtl
None of these
Colburn

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

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Heat Transfer
For a fluid flowing in an annulus space, the wetted perimeter for heat transfer and pressure drop are

Never different
Same
Linearly related
Different

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Heat Transfer
The ratio of momentum diffusivity to thermal diffusivity is the __________ number.

Stanton
Nusselt
Grashoff
Prandtl

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Heat Transfer
1 BTU/hr.ft.°F is equal to __________ kcal/hr. m.°C.

1.49
None of these
4.88
1

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