Related Questions

The effect of solid boundary on the fluid flow is confined to the boundary layer, except for fluids
A Having high viscosities
B Moving at low velocities
C Both A and B
D Neither A nor B
The ratio of the thickness of thermal boundary layer to the thickness of hydrodynamic boundary layer is equal to (Prandtl number) n, where n is equal to
A $$ - \frac{1}{3}$$
B $$ - \frac{2}{3}$$
C 1
D $$-1$$
The ratio of hydrodynamic boundary layer to thermal boundary layer thickness in case of liquid metals is
A [

A.

B. 1

B > 1
C 2
Thickness of thermal boundary layer is more compared to that of hydrodynamic boundary layer, when the value of Prandtl number is
A 1
B > 1
C > 5
In which type of fluid flow, the velocity of flow of fluid changes from point to point in the fluid at any instant?
A Rotational
B Unsteady
C Turbulent
D Non-uniform
The boundary layer is that part of a moving fluid, in which the fluid velocity is
A Affected by the fluid flow pressure
B Constant
C Affected by the presence of a solid boundary
D All of the above
Routers operate at layer _____. LAN switches operate at layer _____. Ethernet hubs operate at layer _____. Word processing operates at layer _____.
A 3, 3, 1, 7
B 3, 2, 1, none
C 3, 2, 1, 7
D 3, 3, 2, none
E All of the above
At the point of boundary layer separation in fluid flow, the
A Shear stress is maximum
B Velocity gradient is flat
C Density variation is maximum
D Shear stress is zero
In fluid flow, the boundary layer separation can not occur
A In case of boundaries experiencing form drag
B At points of abrupt changes in the flow directions
C In laminar flow
D None of these
In convection heat transfer from hot flue gases to water tube, even though flow may be turbulent, a laminar flow region (boundary layer of film) exists close to the tube. The heat transfer through this film takes place by
A Convection
B Radiation
C Conduction
D Both convection and conduction

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