When a problem states “The velocity of the water flow in a pipe is 20 m/s”, which of the following velocities is it talking about?

Related MCQs

• A circular pipe of radius 7 cm is used for water flow transmission. This pipe is moulded into another pipe with a square cross-section keeping the length same. (Ignore the thickness of the pipe). Calculate the hydraulic diameter of the moulded pipe. (Take π = 22/7).
• The Reynolds number is found out for a flow in a circular pipe. This circular pipe is moulded into a square pipe, keeping length of the pipe same. Ignore the thickness of the pipe. The Reynolds number changes by
• The flow through a circular pipe is laminar. Now, the fluid through the pipe is replaced with a more viscous fluid and passed through the pipe again with the same velocity. What can we say about the nature of this flow?
• What can be the maximum diameter of the pipe for the water flow of velocity 1 m/s (ν = 10-6) to be laminar in nature? Assume Lower critical Reynolds number to be 2100.
• For a fully-developed pipe flow, how does the pressure vary with the length of the pipe?
• Different velocities in a centrifugal pump are determined by using  
• Different velocities in a centrifugal pump are determined by using                  
• In which of the following type of runners the velocity of whirl at inlet is greater than the blade velocity?
• In the velocity diagrams for Francis turbine, which of the following velocity directions is along the blade curvature?
• Which of the factors primarily decide whether the flow in a circular pipe is laminar or turbulent?