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Heat Transfer

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

None of these
4.88
1.49
1

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Heat Transfer
Which one gives the monochromatic emissive power for black body radiation ?

Stefan-Boltzman law
Wien's law
Planck's law
Kirchhoffs law

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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

Infinity
Maximum
Zero
Minimum

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Heat Transfer
Heat transfer by conduction in the turbulent core of a fluid flowing through a heated pipe is negligible, if the value of Prandtl number is

0.4
0.8
0.6
0.2

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Heat Transfer
A concentric double pipe heat exchanger as compared to the shell and tube heat exchanger for the same heat load requires

None of these
Less heating surface
Lower maintenance cost
More space

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Heat Transfer
__________ paint has the minimum absorption co-efficient.

Light cream
Grey
White lead
Black

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