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Heat Transfer

Heat Transfer
In forced convection, the heat transfer depends on

Re, Gr
Re, Pr
none of the listed here
mainly Gr

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Heat Transfer
The wavelength at which the maximum monochromatic emissive power occurs for a black body, is (where, T = absolute temperature of the black body)

α 1/T
αT
Independent of T
α T⁴

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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

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

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Heat Transfer
The heat transfer by radiation from a mild steel surface is to be reduced by reducing the emissivity of the surface. This can be best achieved by

Painting the surface white (with aluminium paint)
Roughening the surface
Giving the surface a mirror finish
Painting the surface black

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Heat Transfer
In a single evaporator system, the steam economy __________ by creating vacuum in the evaporator.

May increase or decrease, depends on the vacuum
Decreases
Remains constant
Increases

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Heat Transfer
Dropwise condensation occurs on __________ surfaces

smooth clean
contaminated cooling
clean and dirt free
polished

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MORE MCQ ON Heat Transfer

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