For a given Reynold number as d/D for an orifice increases, Cd will (where, d & D are orifice & pipe diameters respectively)?

Related Mcqs:

1. With increase in the ratio of orifice diameter to pipe diameter, the fraction of the orifice pressure differential that is permanently lost________________?

   A. Increases
   B. Decreases
   C. Remains unchanged
   D. Increases exponentially

2. When the pipe Reynold’s number is 6000, the flow is generally___________________?

   A. Viscous
   B. Laminar
   C. Turbulent
   D. Transition

3. The pressure drop per unit length of pipe incurred by a fluid ‘X’ flowing through pipe is Δp. If another fluid ‘Y’ having both the specific gravity & density just double of that of fluid ‘X’, flows through the same pipe at the same flow rate/average velocity, then the pressure drop in this case will be__________________?

   A. Δp
   B. 2Δp
   C. Δp2
   D. Δp/2

4. 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)

5. With increase in the ratio of orifice diameter to pipe diameter in case of an orificemeter, the overall pressure loss_______________?

   A. Decreases
   B. Increases
   C. Remain constant
   D. Increases linearly

6. The boundary layer thickness at a given section along a flat plate _____________ with increasing Reynold’s number?

   A. Increases
   B. Decreases
   C. Remain same
   D. May increase or decrease

7. What is the ratio of fluid carrying capacity of two pipes having diameters d1 and d2 respectively ?

   A. (d1/d2)0.8
   B. (d1/d2)0.5
   C. d1/d2
   D. (d1/d2)2

8. For laminar flow of Newtonian fluids through a circular pipe, for a given pressure drop and length & diameter of pipe, the velocity of fluid is proportional to (where, μ = fluid viscosity ) ?

   A. μ
   B. 1/μ
   C. √μ
   D. 1/√μ

9. The pipe wall thickness is minimum for a pipe of given nominal size having schedule number___________________?

   A. 160
   B. 120
   C. 80
   D. 40

10. The actual velocity at vena-contracta for flow through an orifice from a reservoir is given by_____________________?

    A. Cv . √(2gH)
    B. Cc . √(2gH)
    C. Cd . √(2gH)
    D. Cv . Va