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Heat Transfer

Heat Transfer
At what value of Prandtl number, the hydrodynamic and thermal boundary layers are identical?

1
80
1.5
0.5

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Heat Transfer
Stefen's block body radiation law can also be derived from __________ law.

Kirchoffs
None of these
Planck's
Fourier's

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Heat Transfer
A multiple effect evaporator has a capacity to process 4000 kg of solid caustic soda per day, when it is concentrating from 10% to 25% solids. The water evaporated in kg per day is

6000
48000
60000
24000

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Heat Transfer
For gases, the thermal conductivity increases with temperature rise. For liquids, with increase in concentration, its thermal conductivity generally

Remains unchanged
Increases exponentially
Decreases
Increases

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Heat Transfer
Convective heat transfer co-efficient in case of fluid flowing in tubes is not affected by the tube length/diameter ratio, if the flow is in the __________ zone.

highly turbulent
None of the listed here
transition
laminar

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Heat Transfer
Correction is applied to LMTD for __________ flow.

Cross
Counter
Parallel
None of these

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