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Heat Transfer

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

1
1.49
None of these
4.88

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Heat Transfer
Choose the most important factor on which the heat conducted through a wall in a unit time will depend on?

Thickness of the wall
Temperature difference between the two surfaces of the wall
Material of the wall
Area of the wall perpendicular to heat flow

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Heat Transfer
Which has the lowest Prandtl number?

Liquid metal
Aqueous solution
Lube oil
Water

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Heat Transfer
Heat transfer by __________ may not necessarily require the presence of a medium

natural convection
radiation
none of the listed here
coduction

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Heat Transfer
Use of transverse baffles in a shell and tube heat exchanger is done to increase the

All of these
Flow velocity
Rate of heat transfer
Turbulence of shell side fluid

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Heat Transfer
The radiation heat flux from a heating element at a temperature of 800°C, in a furnace maintained at 300°C is 8 kW/m². The flux, when the element temperature is increased to 1000°C for the same furnace temperature is

11.2 kW/m²
12.0 kW/m²
14.6 kW/m²
16.5 kW/m²

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