25.1.3. Mechanical Energy Losses

Try these first

1. 1.

   What is the hydraulic gradient line in open channel flow?

   Hint

   Think about the pressure head in open channels.

2. 2.

   Define mechanical energy losses.

   Hint

   Consider energy sufficiency in fluid systems.

3. 3.

   What happens to the hydraulic gradient line when fluid exits a pipe?

   • It remains the same
   • It coincides with atmospheric pressure
   • It rises
   • It is irrelevant

   Hint

   Think about the condition of the pressure head at the exit.

4. 4.

   True or False: Mechanical energy is completely converted into useful energy by turbines.

   • True
   • False

   Hint

   Consider energy losses due to operational inefficiencies.

5. 5.

   A fluid system with a known pressure drop is measured at two points. Apply Bernoulli’s Principle to find the change in velocity. Assume negligible losses.

   Hint

   Ensure to isolate V2 in the equation, while swapping P1 and P2 appropriately.

6. 6.

   Design a pump-turbine system with specific efficiency goals. What aspects would you consider to minimize losses?

   Hint

   Explore fluid characteristics and reduce turbulence.