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Heat Transfer

Heat Transfer
Prandtl number for most of dry gases is about

0.001
70
150
0.72

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Heat Transfer
Which area is used in case of heat flow by conduction through a cylinder ?

None of the listed here
Arithmetic mean area
Logarithmic mean area
Geometric mean area

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Heat Transfer
Overall heat transfer co-efficient for cooling of hydrocarbons by water is about

50 -100 Kcal/hr.m².°C
50 -100 BTU/hr. ft.2°F
50 -100 W/m² . °K
1000 - 1500 BTU/hr. ft.2°F

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

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

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Heat Transfer
Conduction occurs in the buffer zone for a fluid flowing through a heated pipe, only when Prandtl number is

< 1
0.1
>1
L

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Heat Transfer
A tank painted with which of the following coloured paints, would heat up maximum by radiation from sun?

White paint
Black paint
Yellow paint
Grey paint

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