A stream tube is that, which has ______________________ cross-section entirely bounded by stream lines?

Related Mcqs:

1. The distribution of shear stress in a stream of fluid in a circular tube is_____________________?

   A. Linear with radius for turbulent flow only
   B. Linear with radius for laminar flow only
   C. Linear with radius for both laminar & turbulent flow
   D. Parabolic with radius for both laminar & turbulent flow

2. In laminar flow through a round tube, the discharge varies ______________________?

   A. Linearly as the viscosity
   B. Inversely as the pressure drop
   C. Inversely as the viscosity
   D. As the square of the radius

3. 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

4. Capillary rise of mercury in a small diameter tube is proportional to (where, d = diameter of the tube, ζ = surface tension of mercury)____________________?

   A. d
   B. 1/d
   C. ζ
   D. 1/ζ

5. A pipe has a porous section of length L as shown in the figure. Velocity at the start of this section of V0. If fluid leaks into the pipe through the porous section at a volumetric rate per unit area q(x/L)2, what will be axial velocity in the pipe at any „x‟? Assume incompressible one dimensional flow i.e., no gradients in the radial direction ?

   A. VX = V0 + q (x3/L2D)
   B. VX = V0 + ⅓q (x3/L2)
   C. VX = V0 + 2q (x2/LD)
   D. VX = V0 + (4/3) q (x3/L2D)

6. For turbulent flow of Newtonian fluid in a circular cross-section pipe, the ratio of maximum to average fluid velocity is ________________?

   A. 0.5
   B. 1
   C. 0.66
   D. < 0.5

7. Mass velocity in case of steady flow and through a constant cross-section conduit is independent of the _________________?

   A. Temperature
   B. Pressure
   C. Both A. & B.
   D. Neither A. nor B.

8. The equivalent diameter for pressure drop calculation for a duct of square cross-section is given by (where, x = each side of the square duct) ?

   A. x
   B. √(πx)
   C. √(2x)
   D. √(x/2)

9. The equivalent diameter for pressure drop calculation for a fluid flowing through a rectangular cross-section channels having sides ‘x’ & ‘y’ is given by_________________?

   A. 2xy/(x + y)
   B. xy/(x + y)
   C. (x + y)/2xy
   D. (x + y)/xy

10. The equivalent diameter for fluid flow through square cross section channel of side ‘x’, for pressure drop calculation purpose is given by____________________?

    A. 4x
    B. 2x
    C. x
    D. √x