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Heat Transfer

Heat Transfer
What is the steam economy in case of a single effect evaporator system?

< 1
>1
1
0.1

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Heat Transfer
Which of the following is directly concerned with the heat transfer?

Sherwood number
Grashoff number
Euler number
Strouhal number

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Heat Transfer
Choose the correct equation.

Nu = (Re) (Pr) (Gz)
Nu = (Pr)(St)
Nu = (Re) (Pr) (St)
Nu = (Re)(Pr)

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Heat Transfer
The absorptivity of a grey body at a given temperature __________ with increasing wavelength of radiation.

Decreases
May increase or decrease ; depends on the material
Remains constant
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
laminar
transition
None of the listed here

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Heat Transfer
Wavelength corresponding to the maximum energy is inversely proportional to the absolute temperature. This is __________ law.

Dalton's
Kirchoffs
Wien's
Stefan's

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