Which of the following pipe bends will incur the largest head loss ?

Related Mcqs:

1. The head loss in turbulent flow in pipe is proportional to(where, V = velocity of fluid through the pipe) ?

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

2. 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

3. 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)

4. For pipe flows, head is proportional to __________ at constant capacity(where, D = pipe diameter) ?

   A. 1/D
   B. 1/D2
   C. 1/D5
   D. D2

5. The head loss in turbulent flow in a pipe varies________________?

   A. As velocity
   B. As (velocity)2
   C. Inversely as the square of diameter
   D. Inversely as the velocity

6. 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

7. Velocity head on sudden enlargement in a horizontal pipe is converted into ______________ head?

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

8. The pressure head on sudden contraction in a horizontal pipe is converted into the _____________ head?

   A. Elevation
   B. Velocity
   C. Both A. & B.
   D. Neither A. nor B.

9. The net positive suction head (NPSH) of a centrifugal pump is defined as the sum of the velocity head and the pressure head at the_________________?

   A. Discharge
   B. Suction
   C. Suction minus vapor pressure of the liquid at suction temperature
   D. Discharge minus vapor pressure of the liquid at the discharge temperature

10. Which of the following two quantities when same, makes one pipe system equivalent to another pipe system ?

    A. Head & discharge
    B. Length & discharge
    C. Length & diameter
    D. Friction factor & diameter