Francis Turbine Velocity Diagrams MCQ

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• In the figure shown below, which of the following type of runners has the blade curvature as shown in the above figure (The arrow denotes direction of blade motion)?
  ক

  Information insufficient to determine

  খ

  Slow Runner

  গ

  Medium Runner

  ঘ

  Fast Runner
• In the figure shown below,which of the following angles replace the question mark?
  ক

  Guide vane angle at inlet

  খ

  Blade angle at inlet

  গ

  Vane angle at inlet

  ঘ

  Blade angle at outlet
• In the velocity diagrams for Francis turbine, which of the following velocity directions is along the blade curvature?
  ক

  Vr1

  খ

  Vw1

  গ

  V1

  ঘ

  u1
• In case of a Medium runner, tan (α1) CANNOT be given by (α1 = Guide vane angle at inlet)?
  ক

  Vf1 / Vw1

  খ

  Vr1 / Vw1

  গ

  Vr1 / u1

  ঘ

  Vw1 / u1
• Which of the following runner types will have the highest vane angle at inlet (β1 value)?
  ক

  Slow Runner

  খ

  Medium Runner

  গ

  Fast Runner

  ঘ

  Vane angle is defined only for Kaplan Turbines and not Francis turbines
• In which of the following type of runners the velocity of whirl at inlet is greater than the blade velocity?
  ক

  Such a case is practically impossible

  খ

  Slow Runner

  গ

  Medium Runner

  ঘ

  Fast Runner
• Which of the following profiles are used for guide vanes to ensure smooth flow without separation?
  ক

  Rectangular

  খ

  Bent Rectangular

  গ

  Elliptical

  ঘ

  Aerofoil
• Why does the cross sectional area of the Spiral casing gradually decrease along the circumference of the Francis turbine from the entrance to the tip?
  ক

  To ensure constant velocity of water during runner entry

  খ

  To prevent loss of efficiency of the turbine due to impulsive forces caused by extra area

  গ

  To prevent leakage from the turbine

  ঘ

  To reduce material costs in order to make the turbine more economical
• Which of the following is true in case of flow of water before it enters the runner of a Francis Turbine?
  ক

  Available head is entirely converted to velocity head

  খ

  Available head is entire converted to pressure head

  গ

  Available head is neither converted to pressure head nor velocity head

  ঘ

  Available head is partly converted to pressure head and partly to velocity head
• What is the water flow direction in the runner in a Francis turbine?
  ক

  Axial and then tangential

  খ

  Tangential and then axial

  গ

  Radial and then axial

  ঘ

  Axial and then radial