MCQOPTIONS
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MCQOPTIONS
This section includes 10 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 forward flight, the airfoil of the blade have fixed stall characteristics. |
| A. | True |
| B. | False |
| Answer» C. | |
| 2. |
Which of these is an important parameter for selecting the rotor blade based on aerodynamic efficiency? |
| A. | Solidity ratio |
| B. | Structural ratio |
| C. | Figure of merit |
| D. | Hovering ratio |
| Answer» D. Hovering ratio | |
| 3. |
Helicopter blades have large diameter. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 4. |
Which of these is not the purpose of rotor blade? |
| A. | Generate lift |
| B. | Counter weight |
| C. | Provide thrust |
| D. | Generate drag |
| Answer» E. | |
| 5. |
What is the flap frequency of a gimballed rotor? |
| A. | 1/rev |
| B. | 2/rev |
| C. | 0.5/rev |
| D. | 10/rev |
| Answer» B. 2/rev | |
| 6. |
Which of these options is a feature of teetering rotor blade? |
| A. | Two blades attached to hub without flap/hinge |
| B. | Three blades attached to hub with only flaps |
| C. | Two blades attached to hub with single flap hinge |
| D. | Four blades attached directly to hub |
| Answer» B. Three blades attached to hub with only flaps | |
| 7. |
Which of these is not suitable for helicopter blade? |
| A. | Moderately hick airfoil |
| B. | Thin airfoil |
| C. | Small pitching moment |
| D. | Unsymmetrical airfoil |
| Answer» E. | |
| 8. |
Which of these conditions is essential for a rotor airfoil when the helicopter has high forward speed? |
| A. | Low critical Mach number |
| B. | Low drag divergence |
| C. | High critical Mach number |
| D. | High angle of attack |
| Answer» D. High angle of attack | |
| 9. |
What is the use of mechanical lag damper? |
| A. | Avoid ground instability |
| B. | Dampen the hub vibration |
| C. | Dampen the resonance in rotor blades |
| D. | Absorb instabilities in hinges and flap |
| Answer» B. Dampen the hub vibration | |
| 10. |
Why is the flap hinge offset in articulated rotor? |
| A. | Design constraints |
| B. | Mechanical constraints |
| C. | Aerodynamics constraints |
| D. | Vibrational constraints |
| Answer» C. Aerodynamics constraints | |