22.2.4. GATE Questions on Fluid Flow

Try these first

1. 1.

   Define hydraulic diameter.

   Hint

   Think about how it applies to noncircular shapes.

2. 2.

   What does wall shear stress refer to?

   Hint

   Consider its importance in flow dynamics.

3. 3.

   What principle is used to define hydraulic diameter?

   • A) Area divided by diameter
   • B) Four times the area divided by the wetted perimeter
   • C) Diameter divided by perimeter

   Hint

   Think about how you simplify flow calculations.

4. 4.

   True or False: Wall shear stress increases with higher fluid velocities.

   • True
   • False

   Hint

   Consider what happens when fluid moves faster against a surface.

5. 5.

   In a complex piping system, each path carries fluid with different diameters. Path one has a diameter of 0.2 m, path two has 0.3 m, and path three has 0.5 m. Calculate the flow velocities if each path's flow rate is 5 m³/h.

   Hint

   Use the formula for area of a circle and convert the units accordingly.

6. 6.

   Given a turbulent flow in a pipe where the Moody Chart indicates a friction factor of 0.02 and a Reynolds number of 10,000, calculate the head loss over a distance of 100m if the diameter is 0.5m.

   Hint

   Ensure you plug in the correct numbers for all variables.