1
MCQ (Single Correct Answer)

GATE ME 2001

Water (Prandtl number $$=6$$ ) flows over a flat plate which is heated over the entire length. Which one of the following relationship between the hydrodynamic boundary layer thickness $$\left( \delta \right)$$ and thermal boundary layer thickness $$\left( {{\delta _t}} \right)$$ is true
A
$${\delta _t} = \delta $$
B
$${\delta _t} < \delta $$
C
$${\delta _t} > \delta $$
D
can not be predicted
2
Subjective

GATE ME 1996

Match List - $${\rm I}$$ with List - $${\rm II}$$ and select the correct answer using the code given below the Lists:

List - $${\rm I}$$
$$A.$$ Grashof number
$$B.$$ Schmid number
$$C.$$ Weber number
$$D.$$ Fourier number

List - $${\rm II}$$
$$1.$$ Mass diffusion
$$2.$$ Transient heat conduction
$$3.$$ Free convection
$$4.$$ Forced convection
$$5.$$ Surface tension
$$6.$$ Radiation

Answer

$$A - 3,\,\,B - 1,\,\,C - 5,\,\,D - 2$$
3
MCQ (Single Correct Answer)

GATE ME 1992

A fluid flowing over a flat plate has the following properties: dynamic viscocity $$ = 25 \times {10^{ - 6}}\,\,kg/ms,$$ specific heat $$=2.0 $$ $$kJ/kgK,$$ thermal conductivity $$0.05W/mK.$$ The hydrodynamic boundary layer thickness is measured to be $$0.5$$ $$mm.$$ The thickness of the thermal boundary layer would be
A
$$0.1mm$$
B
$$0.5mm$$
C
$$1.0mm$$
D
none

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