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Heat Transfer

Heat Transfer
Electromagnetic radiations propagate in vacuum with a velocity of __________ metre/second.

3 x l05
3 x l08
3 x l010
3 x l012

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Heat Transfer
Nusselt number is a function of Prandtl number and __________ number of fluid in natural convection heat transfer.

Reynolds
Grashoff
Stantan
Biot

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Heat Transfer
Harmonic mean temperature difference is given by

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

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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

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

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Heat Transfer
The ratio of the total emissive power to the absorptivity for all bodies is same at ther-mal equilibrium. This is __________ law.

Stefan-Boltzman
Kirchoffs
Planck's
Wien's displacement

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

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

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