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Heat and Mass Transfer

Heat and Mass Transfer
If the temperature of a solid surface changes form 27°C to 627°C, then its emissive power changes in the ratio of

9
270
81
3

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Heat and Mass Transfer
Reynolds number is the ratio of

Kinematic viscosity to thermal diffusivity
Inertia force to viscous force
Energy transferred by convection to that by conduction
None of these

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Heat and Mass Transfer
Which of the following is a case of steady state heat transfer?

Air preheaters
I.C. engine
None of these
Heating of building in winter

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Heat and Mass Transfer
According to Dalton's law of partial pressures, (where pb = Barometric pressure, pa = Partial pressure of dry air, and pv = Partial pressure of water vapour)

Pb = pa/pv
Pb = pa × pv
Pb = pa - pv
Pb = pa + pv

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Heat and Mass Transfer
A composite slab has two layers of different materials with thermal conductivities k₁ and k₂. If each layer has the same thickness, then the equivalent thermal conductivity of the slab will be

(k₁ + k₂)/ k₁ k₂
2 k₁ k₂/ (k₁ + k₂)
(k₁ + k₂)
k₁ k₂

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Heat and Mass Transfer
Wien’s law states that the wave length corresponding to ________ is proportional to the absolute temperature.

Maximum energy
Both (A) and (B)
None of these
Minimum energy

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