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Heat Transfer

Heat Transfer
The range of electromagnetic spectrum important in heat transfer by radiation is __________ microns.

0.5-50
5-50
100-1000
0.38-0.78

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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

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

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Heat Transfer
In a parallel flow heat exchanger, if the outlet temperature of hot and cold fluids are the same, then the log mean temperature difference (LMTD) is

Minimum
Infinity
Zero
Maximum

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Heat Transfer
Multiple effect evaporation accounts for

Lower operating costs
Investment economy
None of these
Steam economy

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Heat Transfer
The separation of liquid droplets from the vapor is done by a/an __________ , in the evaporators.

Vacuum pump
Steam ejector
Entrainment separator
Compressor

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Heat Transfer
Reynold's analogy states that (where, St = Stanton number f = friction factor)

St = f1/2
St = 4f
St = f/4
St = f/2

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