Turbulent flow generally occurs for cases involving__________________?

Related Mcqs:

1. Bernoulli’s equation for fluid flow is derived following certain assumptions. Out of the assumptions listed below, which set of assumptions is used in derivation of Bernoulli’s equation? A. Fluid flow is frictionless & irrotational. B. Fluid flow is steady. C. Fluid flow is uniform & turbulent. D. Fluid is compressible. E. Fluid is incompressible ?

   A. A, C, D
   B. B, D, E
   C. A, B, E
   D. A, D, E

2. For turbulent flow of an incompressible fluid through a pipe, the flow rate „Q‟ is proportional to (Δ P)n, where ΔP is the pressure drop. The value of exponent ‘n’ is_________________?

   A. 1
   B. 0
   C. < 1
   D. > 1

3. In a fully turbulent flow (Re > 105) in a pipe of diameter ‘d’, for a constant pressure gradient, the dependence of volumetric flow rate of an incompressible fluid is_______________?

   A. d
   B. d2
   C. d2.5
   D. d4

4. Transition from laminar flow to turbulent flow is aided by the__________________?

   A. Surface roughness and curvature (i.e. sharp corners)
   B. Vibration
   C. Pressure gradient and the compressibility of the flowing medium
   D. All A., B. & C.

5. In case of unsteady fluid flow, conditions & flow pattern change with the passage of time at a position in a flow situation. Which of the following is an example of unsteady flow ?

   A. Discharge of water by a centrifugal pump being run at a constant rpm
   B. Water flow in the suction and discharge pipe of a reciprocating pump
   C. Water discharge from a vertical vessel in which constant level is maintained
   D. Low velocity flow of a highly viscous liquid through a hydraulically smooth pipe

6. Pressure drop (Δp) for a fluid flowing in turbulent flow through a pipe is a function of velocity (V) as___________________?

   A. V1.8
   B. V-0.2
   C. V2.7
   D. V2

7. In case of turbulent flow of fluid through a circular pipe, the __________________?

   A. Mean flow velocity is about 0.5 times the maximum velocity
   B. Velocity profile becomes flatter and flatter with increasing Reynolds number
   C. Point of maximum instability exists at a distance of 2r/3 from the pipe wall (r = pipe radius)
   D. Skin friction drag, shear stresses, random orientation of fluid particles and slope of velocity
   profile at the wall are more

8. In turbulent flow, a rough pipe has the same friction factor as a smooth pipe____________________?

   A. In the zone of complete turbulence
   B. When the roughness projections are much smaller than the thickness of the laminar film
   C. Everywhere in the transition zone
   D. When the friction factor is independent of the Reynold’s number

9. For turbulent flow in smooth circular pipe, the velocity distribution is a function of the distance ‘d’ measured from the wall of the pipe and the friction velocity ‘v’, and it follows a _____________ relationship?

   A. Logarithmic
   B. Linear
   C. Hyperbolic
   D. Parabolic

10. The head loss in turbulent flow in a pipe varies_________________?

    A. Directly as the velocity
    B. Inversely as the square of the velocity
    C. Approximately as the square of the velocity
    D. Inversely as the square of the diameter