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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
1.49

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Heat Transfer
The Graetz number is concerned with the

absorption with chemical reaction
mass transfer between a gas and a liquid
heat transfer in turbulent flow
heat transfer in laminar flow

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Heat Transfer
Overall thermal resistance for conductive heat transfer through a series of flat resistances is equal to the

Average of all resistances
Maximum resistance in the series
Sum of all resistances
Minimum resistance presents in the series

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Heat Transfer
Heat transfer rate described by Fourier's law will decrease, if the __________ increases.

Heat transfer area
Thermal conductivity
Temperature difference
Thickness

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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
Minimum
Zero

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Heat Transfer
The most conducive surface for dropwise condensation to occur is the __________ surface.

Oily
Smooth
Coated
Glazed & polished

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