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Heat Transfer

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

4.88
None of these
1.49
1

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Heat Transfer
In Fourier's law, the proportionality constant is called the

Thermal conductivity
Stefan-Boltzman constant
Heat transfer co-efficient
Thermal diffusivity

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Heat Transfer
Film boiling is usually not desired in commercial equipments, because

the heat transfer rate is low in view of the large temperature drop. @
none of the listed here
it is not economic
it is difficult to maintain

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Heat Transfer
Calburn analogy is applicable for the value of Prandtl number from

0.5 to 5
0.001 to 1
120 to 400
0.6 to 120

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Heat Transfer
The Nusselt number for fully developed (both thermally and hydrodynamically) laminar flow through a circular pipe, where the wall heat flux is constant, is

2.36
4.36
Dependent on NRe only
120.36

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Heat Transfer
A multiple effect evaporator as compared to a single effect evaporator of the same capacity has

Lower heat transfer area
Higher solute concentration in the product
Lower steam economy
Higher steam economy

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