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Heat Transfer

Heat Transfer
Heat transfer by conduction in the turbulent core of a fluid flowing through a heated pipe is negligible, if the value of Prandtl number is

0.4
0.6
0.2
0.8

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Heat Transfer
Steam is routed through the tube in case of a __________ evaporator.

Short tube vertical
Long tube vertical
Horizontal tube
Basket type

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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
The separation of liquid droplets from the vapor is done by a/an __________ , in the evaporators.

Vacuum pump
Compressor
Steam ejector
Entrainment separator

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Heat Transfer
Maximum water velocity in tubes of a 1-2 shell and tube heat exchanger may be around __________ metres/second.

1
30
10
20

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Heat Transfer
The average heat transfer co-efficient for laminar film condensation on vertical surface is inversely proportional to (where, ΔT = Temperature drop across condensate film )

(ΔT)2
ΔT
(ΔT)1/4
None of the listed here

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