MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 11 Mcqs, each offering curated multiple-choice questions to sharpen your Aerodynamics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
For low rotor solidity, profile drag increases. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2. |
What is rotor polar? |
| A. | Plot of power coefficient as a function of thrust coefficient |
| B. | Plot of thrust coefficient as a function of power coefficient |
| C. | Plot of power coefficient as a function of lift coefficient |
| D. | Plot of power coefficient as a function of drag coefficient |
| Answer» B. Plot of thrust coefficient as a function of power coefficient | |
| 3. |
What is the inflow ratio for hovering? |
| A. | 1-1.5 |
| B. | 0.05-0.07 |
| C. | 0.6-1 |
| D. | 0.01-0.05 |
| Answer» C. 0.6-1 | |
| 4. |
What is the formula for the helix angle? |
| A. | Φ=tan-1\(\frac {V_0}{V_E}\) |
| B. | Φ=sin-1\(\frac {V_0}{V_E}\) |
| C. | Φ=cos-1\(\frac {V_0}{V_E}\) |
| D. | Φ=tan-1\(\frac {V_E}{V_0}\) |
| Answer» B. Φ=sin-1\(\frac {V_0}{V_E}\) | |
| 5. |
Why is blade element theory preferred over momentum theory for designing a propeller? |
| A. | Assumes flow inside stream tube as constant |
| B. | Neglects span wise flow |
| C. | Model thrust lag |
| D. | Account for varying blade geometry |
| Answer» E. | |
| 6. |
How does the blade element theory treat the airfoil as? |
| A. | One-dimensional |
| B. | Two-dimensional |
| C. | Three-dimensional |
| D. | One complete body |
| Answer» C. Three-dimensional | |
| 7. |
When is the blade element theory applicable? |
| A. | When solidity is much greater than 1 |
| B. | When solidity is much lesser than 1 |
| C. | When solidity is equal to 1 |
| D. | When solidity is equal to 0 |
| Answer» C. When solidity is equal to 1 | |
| 8. |
How many times is the angular velocity of flow behind airscrew compared to that of angular velocity in plane of airscrew? |
| A. | Same |
| B. | Twice |
| C. | Thrice |
| D. | Four times |
| Answer» C. Thrice | |
| 9. |
The bound and trailing vortex cancel out each other in the plane of the airscrew blade. |
| A. | True |
| B. | False |
| Answer» C. | |
| 10. |
Which shape is traced by the trailing vortex at the tip of the airscrew blade? |
| A. | Helix |
| B. | Solenoid |
| C. | Circle |
| D. | Sine curve |
| Answer» B. Solenoid | |
| 11. |
What is the blade element theory used for? |
| A. | Predict performance of airscrew airfoil |
| B. | Predict performance of wind turbine |
| C. | Predict performance of supersonic airfoil |
| D. | Predict performance of flat plate |
| Answer» B. Predict performance of wind turbine | |