MCQOPTIONS
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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. |
How is induced velocity in far wake region and actuator disk related in climb condition? |
| A. | w=√v |
| B. | w=v2 |
| C. | w=2v |
| D. | w=3v |
| Answer» D. w=3v | |
| 2. |
What is the relation between the induced velocity in far wake region (w) and that at the rotor disk (v) for hovering condition? |
| A. | w=v |
| B. | w=v2 |
| C. | w=2v |
| D. | w=v/2 |
| Answer» D. w=v/2 | |
| 3. |
The momentum conservation equation for a helicopter in climb state is independent of which term? |
| A. | Climb velocity |
| B. | Induced velocity |
| C. | Wake velocity |
| D. | Mass flux |
| Answer» B. Induced velocity | |
| 4. |
Which of these is not an assumption made while formulating momentum theory for hover and clib of a helicopter? |
| A. | Blade is modeled as an actuator disk |
| B. | Non-uniform loading over the disk |
| C. | Smooth slipstream |
| D. | Slipstream rotation velocity is negligible |
| Answer» C. Smooth slipstream | |
| 5. |
What is the ideal range of disk loading for high hover performance? |
| A. | 10-100 \(\frac {N}{m^2}\) |
| B. | 100-500 \(\frac {N}{m^2}\) |
| C. | 1000-4000 \(\frac {N}{m^2}\) |
| D. | 5000-10,000 \(\frac {N}{m^2}\) |
| Answer» C. 1000-4000 \(\frac {N}{m^2}\) | |
| 6. |
Disk loading affects the hovering efficiency. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 7. |
In order to increase the hovering efficiency, which parameter must be taken care of? |
| A. | High power by thrust ratio |
| B. | High thrust by area ratio |
| C. | Low induced drag |
| D. | High rotor tip speed |
| Answer» B. High thrust by area ratio | |
| 8. |
What is the formula for induced velocity for a helicopter while it hovers? |
| A. | vh=\(\frac {T}{2\rho A}\) |
| B. | vh=\(\sqrt {\frac {T}{2\rho A}}\) |
| C. | vh=\(\frac {T^2}{\rho A}\) |
| D. | vh=2ρAT |
| Answer» C. vh=\(\frac {T^2}{\rho A}\) | |
| 9. |
The actual induced power loss result is less than the momentum theory result. |
| A. | True |
| B. | False |
| Answer» C. | |
| 10. |
For momentum theory analysis, what is rotor modelled as? |
| A. | Thin actuator disk |
| B. | Thick actuator disk |
| C. | Angled blade |
| D. | Two dimensional airfoil |
| Answer» B. Thick actuator disk | |
| 11. |
Who developed the momentum theory? |
| A. | Daniel Bernoulli |
| B. | Ludwig Prandtl |
| C. | Osborne Reynolds |
| D. | W.J.M. Rankine |
| Answer» E. | |