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Heat Transfer

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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Heat Transfer
For a liquid in laminar flow through a very long tube, when the exit fluid temperature approaches the wall temperature, the equation to be used is

Nu = 0.023 Re0.8 . Pr0.4
Nu = 2Gz0.5
Nu = Gz
Nu = Gz

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Heat Transfer
The actual temperature drop across the heating surface in an evaporator depends on the

Pressure difference between steam chest and vapour space
Feed
Depth of liquid over heating surface
All of these

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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)

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

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Heat Transfer
The interchange factor for radiation heat transfer from surface 'x' to surface 'y' in case of an infinite parallel planes with emis-sivities εx & εy is given by

Εx . εy
Εx + εy
(εx + εy)/(εx + εy - εx . εy)
1/εx + 1/εy

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Heat Transfer
Which of the following is generally considered as opaque surface towards radiations?

Both solids & liquids
Solids
Gases
Liquids

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