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Heat Transfer

Heat Transfer
Thickness of thermal boundary layer is more compared to that of hydrodynamic boundary layer, when the value of Prandtl number is

< 1
1
> 1
> 5

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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
Zero
Maximum
Infinity

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Heat Transfer
Dropwise condensation occurs on __________ surfaces

contaminated cooling
clean and dirt free
smooth clean
polished

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

Black
Grey
Light cream
White lead

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Heat Transfer
In an interphase heat transfer process, the equilibrium state corresponds to equality of temperature in the two phases, while the condition for equilibrium in an interphase mass transfer process is equality of

Activity co-efficients
Concentrations
Mass transfer co-efficients
Chemical potentials

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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
Area of the wall perpendicular to heat flow
Material of the wall

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MORE MCQ ON Heat Transfer

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