Which among the following is the formula for relative velocity?

Related MCQs

• The relative velocity of water at the inlet of the Kaplan turbine is 7 m/s. β1 = 75o. The whirl velocity of the water at inlet is 10 m/s. Find the blade velocity of the turbine?
• In Pelton wheel, relative inlet velocity of jet with respect to velocity of vane is
• In the outlet velocity triangle of a Kaplan turbine, β2 = 30o. Vf2 = 5 m/s. What is the relative velocity of the flow at outlet?
• Power developed by Francis turbine are calculated for a certain set of conditions. Now, the inlet whirl velocity is doubled, the blade velocity at inlet is doubled and the flow velocity is quartered. The power developed:
• Volume flow rate of water in a Francis turbine runner is 25 m3/s. The flow velocity, whirl velocity and blade velocity are 11 m/s, 10 m/s and 5 m/s respectively, all values given at runner inlet. Find the power developed by the turbine.
• In the inlet velocity triangle of a Kaplan turbine, α1 = 45o. The velocity of flow at inlet = 10 m/s. Find the whirl velocity of water at the inlet of Kaplan turbine?
• The relative velocity is obtained by the equation                 
• In which of following turbine inlet whirl velocity and inlet jet velocity are equal in magnitude?
• 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?