MCQOPTIONS
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MCQOPTIONS
This section includes 9 Mcqs, each offering curated multiple-choice questions to sharpen your Rocket Propulsion knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Dynamic pressure experienced by the rocket in the lower atmosphere is ______ compared to that experienced at higher altitudes. |
| A. | more |
| B. | less |
| C. | equal |
| D. | any random value |
| Answer» C. equal | |
| 2. |
Which of the following is the correct expression for gravitational acceleration (g) at a height h, given go refers to gravitational acceleration on the earth s surface and Ro refers to effective radius of earth? |
| A. | g=g<sub>o</sub>[R<sub>o</sub>/(R<sub>o</sub>+h)]<sup>2</sup> |
| B. | g=g<sub>o</sub>[R<sub>o</sub>/(R<sub>o</sub>-h)]<sup>2</sup> |
| C. | g=g<sub>o</sub>[(R<sub>o</sub>+h)/2R<sub>o</sub>]<sup>2</sup> |
| D. | g=g<sub>o</sub>[(R<sub>o</sub>-h)/2R<sub>o</sub>]<sup>2</sup> |
| Answer» B. g=g<sub>o</sub>[R<sub>o</sub>/(R<sub>o</sub>-h)]<sup>2</sup> | |
| 3. |
What is the loss of velocity increment experienced by a rocket as a result of drag in the atmosphere? |
| A. | 5-10% |
| B. | 15-20% |
| C. | 25-30% |
| D. | 35-40% |
| Answer» B. 15-20% | |
| 4. |
The lift and drag coefficients are not primarily a function of ____________ |
| A. | vehicle configuration |
| B. | flight Mach number |
| C. | angle of attack |
| D. | vehicle mass |
| Answer» E. | |
| 5. |
What is the angle of attack for a missile? |
| A. | The angle between the local horizon and the missile axis |
| B. | The angle between the local horizon and the missile flight path |
| C. | The angle between the missile axis and its flight path |
| D. | The angle between the relative wind and the missile longitudinal axis |
| Answer» D. The angle between the relative wind and the missile longitudinal axis | |
| 6. |
In writing the expressions for CL and CD for missiles and rockets, what does area A denote? |
| A. | Sum of all the fin areas |
| B. | The total surface area of the missile/rocket including the fins |
| C. | Maximum cross-sectional area normal to the missile axis |
| D. | Minimum cross-sectional area normal to the missile axis |
| Answer» D. Minimum cross-sectional area normal to the missile axis | |
| 7. |
If L denotes the lift and denotes flight path angle, then what is the aerodynamic force acting normal to the flight path? |
| A. | Lcos |
| B. | Lsin |
| C. | Lsec |
| D. | L |
| Answer» E. | |
| 8. |
Which of the following is a reasonable factor of increase for effective exhaust velocity (c) as altitude is increased? |
| A. | 1.5 |
| B. | 2.1 |
| C. | 3.2 |
| D. | 4.5 |
| Answer» B. 2.1 | |
| 9. |
Which of the following is not an external force acting on a vehicle flying in the earth s atmosphere? |
| A. | Thrust |
| B. | Aerodynamic forces |
| C. | Gravitational forces |
| D. | Forces due to thermal stress |
| Answer» E. | |