1
MCQ (Single Correct Answer)

GATE ME 2003

Consider a laminar boundary layer over a heated flat plate. The free stream velocity is $${U_\infty }.$$ At some distance $$x$$ from the leading edge the velocity boundary layer thickness is $${\delta _v}$$ and the thermal boundary layer is $${\delta _r}.$$ If the Prandtl number is greater than $$1,$$ then
A
$${\delta _v} > {\delta _r}$$
B
$${\delta _r} > {\delta _v}$$
C
$${\delta _v} = {\delta _r} \sim \left( {{U_\infty }} \right)$$
D
$${\delta _v} = {\delta _r} \sim {x^{ - 1/2}}$$
2
MCQ (Single Correct Answer)

GATE ME 2002

The properties of mercury at $$300K$$ are : density $$ = 13529kg/{m^3},$$ $${C_P} = 0.1393$$ $$kJ/kgK,$$ dynimic viscosity $$ = 0.1523\,\, \times \,\,{10^{ - 2}}\,\,N - s/{m^2}$$ and thermal conductivity $$=8.540$$ $$W/m$$-$$K$$. The Prandtl number of the mercury at $$300K$$ is
A
$$0.0248$$
B
$$2.48$$
C
$$24.8$$
D
$$248$$
3
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
4
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

$$A - 3,\,\,B - 1,\,\,C - 5,\,\,D - 2$$

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