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Heat Transfer

Heat Transfer
1 BTU/hr.ft.°F is equal to __________ kcal/hr. m.°C.

None of these
1
4.88
1.49

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Heat Transfer
The ratio of the total emissive power to the absorptivity for all bodies is same at ther-mal equilibrium. This is __________ law.

Planck's
Wien's displacement
Kirchoffs
Stefan-Boltzman

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Heat Transfer
A perfect black body is a perfect __________ of radiation

emitter
none of the listed here
Both emitter & absorber
absorber

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Heat Transfer
In a forward feed multiple effect, the pressure build up will be

least at the inlet of the first effect
highest at the inlet of the last effect
least at the outlet of the last effect
highest at the outlet of the last effect

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Heat Transfer
Peclet number (Pe) is given by

Pe = Re/Pr
Pe = Re.Pr
Pe = Nu.Re
Pe = Pr/Re

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Heat Transfer
Nusselt number for full developed, laminar, constant property flow in a pipe at uniform heat flux is

4.364
0.72
83
18

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