railway RRB JE (CBT I + CBT II) Mock Test 2024 Heat Transfer Convection Boundary Layer Theory

In the laminar flow of air (Pr = 0.7) over a heated plate if δ and δT denote, respectively, the hydrodynamic and thermal boundary layer thicknesses, then

1
δ = δT
2
δ > δT
3
δ < δT
4
δ = 0 but δT ≠ 0
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