Reynolds number of a fluid flowing in a circular pipe is 10,000. What will be the Reynolds number when the fluid velocity is decreased by 30% & the pipe diameter is increased by 30% ?

Related Mcqs:

1. The pressure drop per unit length for laminar flow of fluid through a long pipe is proportional to (where, A = cross-sectional area of the pipe & D = Diameter of the pipe) ?

   A. A
   B. D
   C. 1/A
   D. 1/A2

2. A fluid is termed as the Newtonian fluid, when the shear stress is _________________ the velocity gradient ?

   A. Independent of
   B. Inversely proportional to
   C. Directly proportional to
   D. None of these

3. The expected efficiency of a single riveted lap joint is of the order of 50%. If the thickness of the plate is increased four times, then the rivet diameter will have to be increased ___________________ times ?

   A. Two
   B. Four
   C. Six
   D. Eight

4. Temperature of hot gases flowing in a pipe is measured by a thermocouple inserted in the thermal well. The thermal well made of ______________ will facilitate the most accurate measurement of the temperature ?

   A. Copper
   B. Steel
   C. Aluminium
   D. Brass

5. Friction factor for fluid flow in pipe does not depend upon the________________?

   A. Pipe length
   B. Pipe roughness
   C. Fluid density & viscosity
   D. Mass flow rate of fluid

6. The friction factor for the turbulent fluid flow in a rough pipe does not depend upon the_________________?

   A. Pipe roughness & pipe diameter
   B. Fluid velocity
   C. Type of flowing fluid
   D. Both B. & C.

7. Transition from laminar flow to turbulent flow in fluid flow through a pipe does not depend upon the___________________?

   A. Length of the pipe
   B. Diameter of the pipe
   C. Density of the fluid
   D. Velocity of the fluid

8. In Newton’s law of viscosity, which states that the shear stress is proportional to the _____________ Co-efficient of viscosity is called dynamic or absolute viscosity(where, V = velocity, Vg = velocity gradient) ?

   A. V2
   B. 1/V2
   C. 1/Vg
   D. Vg

9. The most economical channel section for the fluid flow is the one for which the discharge is maximum for a given cross-sectional area. Vertical velocity distribution in an open channel for laminar flow can be assumed to be_______________?

   A. Parabolic
   B. Hyperbolic
   C. Straight line
   D. None of these

10. Gage pressure within a spherical droplet of a fluid is ‘p’. What will be gage pressure within a bubble of the same size & of the same fluid ?

    A. p
    B. 2 p
    C. 0.5 p
    D. 0.25 p