A. Applicable to laminar flow problems
B. A universal constant
C. Zero at the pipe wall
D. None of these
Related Mcqs:
- The Prandtl mixing length is_________________?
A. Zero at the pipe wall and is a universal constant
B. Independent of radial distance from the pipe axis
C. Independent of the shear stress
D. Useful for computing laminar flow problems - For turbulent fluid flow in pipe, the expression for Prandtl one seventh power law is (where, r = pipe radius, x = distance) ?
A. V/Vmax = (x/r)1/7
B. V/Vmax = (r/x)1/7
C. V/Vmax = (x.r)1/7
D. None of these - Prandtl number is a measure of the__________________?
A. Heat conduction to viscosity of a fluid
B. Cp/Cv of a fluid
C. Elastic force to pressure force in the fluid flow
D. Inertial force to elastic force in the fluid flow - The Prandtl Pitot tube measures the__________________?
A. Velocity at a point in the flow
B. Pressure at a point
C. Average flow velocity
D. Pressure difference in pipe flow - Power required for mixing Newtonian fluids is a function of the _________________?
A. Speed of impeller, diameter of impeller & viscosity
B. Density & viscosity of fluid only
C. Density of fluid, viscosity of fluid & impeller dia only
D. None of these - Baffles in mixing tanks are provided to__________________?
A. Reduce swirling and vortex formation
B. Increase the structural strength of the tank
C. Aid in rotational flow
D. None of these - The length of the tube necessary for the boundary layer to reach the centre of the tube and for fully developed flow to be established is called the _____________ length?
A. Equivalent
B. Transition
C. Prandtl mixing
D. None of these - N. second/m2 is___________________?
A. The S.I. unit of dynamic viscosity
B. The S.I. unit of kinematic viscosity
C. Equivalent to one poise
D. Equivalent to one stoke - Creeping flow around a sphere is defined, when particle Reynolds number is___________________?
A. < 2100
B. < 0.1
C. > 2.5
D. < 500 - The hydraulic diameter of an annulus of inner and outer radii Ri and Ro respectively is___________________?
A. 4(Ro-Ri)
B. √(Ro-Ri)
C. 2(Ro-Ri)
D. Ro + Ri
