MCQOPTIONS
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MCQOPTIONS
This section includes 14 Mcqs, each offering curated multiple-choice questions to sharpen your Wind Energy knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
What is blade element momentum theory? |
| A. | It is same as blade element theory |
| B. | It is same as momentum theory |
| C. | It talks about the motion of a body in a given frame of reference |
| D. | It is used to calculate the local forces on the propeller or blade |
| Answer» E. | |
| 2. |
Which theory is used to model the wind turbine? |
| A. | Blade element momentum theory |
| B. | Kinetic gas theory |
| C. | Archimedes principle |
| D. | Einstein s theory of photoelectric effect |
| Answer» B. Kinetic gas theory | |
| 3. |
Which of the following is best reason for not using longer blades even though they produce greater output power? |
| A. | Longer turbine blades experience greater forces |
| B. | Longer turbine blades experience lesser forces |
| C. | Safety concerns due to greater momentum of longer blades |
| D. | Stronger materials are available in abundance |
| Answer» D. Stronger materials are available in abundance | |
| 4. |
Why should longer turbine blades be made of stronger materials? |
| A. | Longer turbine blades experience greater forces |
| B. | Longer turbine blades experience lesser forces |
| C. | Stronger materials are cheaper |
| D. | Stronger materials are available in abundance |
| Answer» B. Longer turbine blades experience lesser forces | |
| 5. |
Increased wind tower height and longer blades do not result in an increase in power. |
| A. | True |
| B. | False |
| Answer» C. | |
| 6. |
Why does wind speed increase with height above ground? |
| A. | More slip boundary conditions |
| B. | Less obstructions and no slip boundary conditions |
| C. | More obstructions and slip boundary conditions |
| D. | Gas molecules have less mass |
| Answer» C. More obstructions and slip boundary conditions | |
| 7. |
Why is a blade twisted along its length rather than its width? |
| A. | Drag reduction |
| B. | Weight reduction |
| C. | Drag reduction and improvement in angle of attack |
| D. | Aesthetic reasons |
| Answer» D. Aesthetic reasons | |
| 8. |
Which of the following blade designs further increases the efficiency of airfoil blades? |
| A. | Twisting and tapering the blades |
| B. | Reducing wind tower height |
| C. | Increasing wind tower height |
| D. | Increasing rotor speed |
| Answer» B. Reducing wind tower height | |
| 9. |
What is the angle by which the rotor blades are twisted? |
| A. | 5-10 degrees |
| B. | 15-45 degrees |
| C. | 100-120 degrees |
| D. | 10-20 degrees |
| Answer» E. | |
| 10. |
The speed at the tip of the blade is faster than its center. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 11. |
There is no ideal angle of attack for best rotation. |
| A. | True |
| B. | False |
| Answer» C. | |
| 12. |
When plotting lift vs angle of attack, which of following best describes the shape of the curve? |
| A. | Exponential |
| B. | Cubic |
| C. | Linear |
| D. | Parabolic |
| Answer» E. | |
| 13. |
What is angle of attack? |
| A. | Angle between downwind side and upwind side |
| B. | Angle between the blade and the rotor |
| C. | Angle between the direction of wind and pitch of the blade |
| D. | Angle between the blade and the wind tower |
| Answer» D. Angle between the blade and the wind tower | |
| 14. |
How is drag force experienced by the blade reduced in various modern blade designs? |
| A. | Bending and tapering the blade |
| B. | Using heavy metals |
| C. | Twirling the blade |
| D. | Increasing the length of the blade |
| Answer» B. Using heavy metals | |