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Heat Transfer

Heat Transfer
Open pan evaporators are preferred to be used, when the solution to be concentrated is

Highly viscous
Salty
Corrosive
Scaling

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Heat Transfer
Which type of heat exchanger is preferred for heavy heat loads ?

Series and parallel set of shell and tube
Plate fine
None of the listed here
Double pipe

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

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Heat Transfer
Asymptotic conditions is reached, when for a fluid flowing in laminar flow through a long tube

Exit-fluid temperature > wall temperature
Exit fluid temperature = wall temperature
Exit fluid temperature < wall temperature
Graetz number > 100

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Heat Transfer
The heat flux in the nucleate boiling regimes is proportional to (where, ΔT = excess temperature)

(ΔT)⁴
(ΔT)²
√(ΔT)
(ΔT)³

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Heat Transfer
If the baffle spacing in a shell and tube heat exchanger increases, then the Reynolds number of the shell side fluid

Remains unchanged
Increases or decreases depending on number of shell passes
Increases
Decreases

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MORE MCQ ON Heat Transfer

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