Temperature distribution is independent of time
Temperature distribution is dependent on time
Heat flows in one direction only
Three dimensional heat flow is concerned
✅ The correct answer is option B.
Engineering
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1372. The thermal boundary layer at NPr > 1
Is thicker than hydrodynamic boundary layer
Is thinner than hydrodynamic boundary layer
And the hydrodynamic boundary layer are identical
Disappears
✅ The correct answer is option B.
1374. The ratio of total radiating power to the absorptivity of the body depends upon the __________ as per Kirchoffs law.
Wavelength of radiation
Nature of the body
Temperature of the body
None of these
✅ The correct answer is option C.
1375. Grashhoff number is given by
gD³.β.Δtρ²/μ²
gD2βΔtρ/μ²
gD2βΔtP²μ
gD³βΔtP²/μ
✅ The correct answer is option A.
1376. For what value of Prandtl number, the Col-burn analogy is valid?
0.06 to 120
0.6 to 120
1 to 103
L to 50
✅ The correct answer is option B.
1377. While the total emissivity of a perfect black body is unity, the same for a real body is
0
1
> 1
Between 0 and 1
✅ The correct answer is option D.
1378. In a shell and tube heat exchanger, floating head is used for
Large temperature differentials
High heat transfer co-efficient
Low pressure drop
Less corrosion of tubes
✅ The correct answer is option A.
1379. Kirchoff s law applies to __________ radiation.
Total
Monochromatic
Both A & B
Neither A nor B
✅ The correct answer is option C.
1380. Which is the most suitable for the concentration of foamy & frothy liquors?
Agitated film evaporator
Long tube vertical evaporator
Open pan evaporator
None of these
✅ The correct answer is option B.