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GATE2015-2-16

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In the laminar flow of air ($P_r$ = $0.7$) over a heated plate, if $\delta$ and $\delta _T$ denote, respectively, the hydrodynamic and thermal boundary layer thicknesses, then

  1. $\delta =\delta _T$
  2. $\delta > \delta _T$
  3. $\delta < \delta _T$
  4. $\delta =0$ but $\delta _T\neq 0$

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