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Heat Transfer

Heat Transfer
(NRe.NPr)(D/L) is called the __________ number

Stanton
None of these
Peclet
Graetz

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Heat Transfer
Three solid objects of the same material and of equal mass-a sphere, a cylinder (length = diameter) and a cube are at 500°C initially. These are dropped in a quenching bath containing a large volume of cooling oil each attaining the bath temperature eventually. The time required for 90% change in temperature is the smallest for

Cylinder
Equal for all the three
Cube
Sphere

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Heat Transfer
The actual temperature drop across the heating surface of an evaporator depends on the

All of these
Pressure difference between the steam chest and the vapor space above the boiling liquid
Solution being evaporated
Liquid depth over the heating surface

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Heat Transfer
Dropwise condensation is promoted on a/an __________ surface.

Smooth
Coated
Oily
Glazed

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Heat Transfer
A BTU/hr.ft.2 °F is equal to

1 kcal/hr. m².°K
1 kcal/hr. m²°C
None of these
4.88 kcal/hr. m.2°C

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Heat Transfer
The value of Stefan-Boltazman constant in SI unit is

5.6697 x 10-8W/m².°K4
0.1714 x 10-8W/m².°K4
5.6697 x 10-8kcal/m² . °K4
0.1714 x 10-8kcal/m². °K4

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