MCQOPTIONS
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MCQOPTIONS
This section includes 11 Mcqs, each offering curated multiple-choice questions to sharpen your Hydraulic Machines knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
In the figure shown below,which of the following angles replace the question mark? |
| A. | Guide vane angle at inlet |
| B. | Blade angle at inlet |
| C. | Vane angle at inlet |
| D. | Blade angle at outlet |
| Answer» B. Blade angle at inlet | |
| 2. |
In case of a Medium runner, tan (α1) CANNOT be given by (α1 = Guide vane angle at inlet)? |
| A. | Vf1 / Vw1 |
| B. | Vr1 / Vw1 |
| C. | Vr1 / u1 |
| D. | Vw1 / u1 |
| Answer» E. | |
| 3. |
Which of the following runner types will have the highest vane angle at inlet (β1 value)? |
| A. | Slow Runner |
| B. | Medium Runner |
| C. | Fast Runner |
| D. | Vane angle is defined only for Kaplan Turbines and not Francis turbines |
| E. | ?a) Slow Runnerb) Medium Runnerc) Fast Runnerd) Vane angle is defined only for Kaplan Turbines and not Francis turbines |
| Answer» D. Vane angle is defined only for Kaplan Turbines and not Francis turbines | |
| 4. |
In the velocity diagrams for Francis turbine, which of the following velocity directions is along the blade curvature? |
| A. | V<sub>r1</sub> |
| B. | V<sub>w1</sub> |
| C. | V<sub>1</sub> |
| D. | u<sub>1</sub> |
| Answer» B. V<sub>w1</sub> | |
| 5. |
In case of a Medium runner, tan (α1) CANNOT be given by (α1 = Guide vane angle at inlet)?$ |
| A. | V<sub>f1</sub> / V<sub>w1</sub> |
| B. | V<sub>r1</sub> / V<sub>w1</sub> |
| C. | V<sub>r1</sub> / u<sub>1</sub> |
| D. | V<sub>w1</sub> / u<sub>1</sub> |
| Answer» E. | |
| 6. |
Which of the following runner types will have the highest vane angle at inlet (β1 value)?$ |
| A. | Slow Runner |
| B. | Medium Runner |
| C. | Fast Runner |
| D. | Vane angle is defined only for Kaplan Turbines and not Francis turbines |
| Answer» D. Vane angle is defined only for Kaplan Turbines and not Francis turbines | |
| 7. |
In which of the following type of runners the velocity of whirl at inlet is greater than the blade velocity? |
| A. | Such a case is practically impossible |
| B. | Slow Runner |
| C. | Medium Runner |
| D. | Fast Runner |
| Answer» C. Medium Runner | |
| 8. |
Which of the following profiles are used for guide vanes to ensure smooth flow without separation? |
| A. | Rectangular |
| B. | Bent Rectangular |
| C. | Elliptical |
| D. | Aerofoil |
| Answer» E. | |
| 9. |
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? |
| A. | To ensure constant velocity of water during runner entry |
| B. | To prevent loss of efficiency of the turbine due to impulsive forces caused by extra area |
| C. | To prevent leakage from the turbine |
| D. | To reduce material costs in order to make the turbine more economical |
| Answer» B. To prevent loss of efficiency of the turbine due to impulsive forces caused by extra area | |
| 10. |
Which of the following is true in case of flow of water before it enters the runner of a Francis Turbine? |
| A. | Available head is entirely converted to velocity head |
| B. | Available head is entire converted to pressure head |
| C. | Available head is neither converted to pressure head nor velocity head |
| D. | Available head is partly converted to pressure head and partly to velocity head |
| Answer» E. | |
| 11. |
What is the water flow direction in the runner in a Francis turbine? |
| A. | Axial and then tangential |
| B. | Tangential and then axial |
| C. | Radial and then axial |
| D. | Axial and then radial |
| Answer» D. Axial and then radial | |