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Heat Transfer

Heat Transfer
Absorptivity and refletivity of a perfect black body are respectively

1 and 0
0 and 1
1 and ?
0 and 0.5

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Heat Transfer
For the same heat load and mass flow rate in the tube side of a shell and tube heat exchanger, one may use multipass on the tube side, because it

Increases the overall heat transfer coefficient
Decreases the outlet temperature of cooling medium
Decreases the pressure drop
None of these

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Heat Transfer
'Fouling factor' used in the design of a multipass shell and tube heat exchanger is a

Conversion factor for individual film heat transfer co-efficient to overall heat transfer co-efficient
Non-dimensional factor
None of these
Factor of safety

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Heat Transfer
Black liquor generated during paper manufacture is concentrated in a

single effect evaporator
multiple effect evaporators followed by a crystalliser
single effect evaporator followed by a crystalliser
multiple effect evaporator

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Heat Transfer
Harmonic mean temperature difference is given by

√(ΔT₁ . ΔT₂)
2.(ΔT₁ . ΔT₂)(ΔT₁ - ΔT₂)
(ΔT₁ - ΔT₂)/(ΔT₁ . ΔT₂)
2.(ΔT₁ . ΔT₂)/(ΔT₁ + ΔT₂)

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Heat Transfer
The statement that "maximum wavelength of radiation is inversly proportional to the temperature" is __________ law.

Planck's
Wien's displacement
None of these
Stefan-Boltzman's

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