MCQOPTIONS
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MCQOPTIONS
This section includes 12 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. |
If for a bell-shaped nozzle, the divergence angle immediately after the throat is 40°, contour angle at the inflection point is 32° and the nozzle full-angle at its exit is 10°, determine the turn-back angle. |
| A. | 8° |
| B. | 35° |
| C. | 27° |
| D. | 22° |
| Answer» D. 22° | |
| 2. |
If the divergence angle for a conical nozzle is 30°, nozzle exit diameter is 30 cm, exit pressure is 10% more than the ambient pressure, mass flow rate is 14 kg/s and the jet exhaust velocity is 700 m/s, determine the total thrust of the engine under standard sea level operating conditions. |
| A. | 11.2 kN |
| B. | 12.9 kN |
| C. | 10.3 kN |
| D. | 9.8 kN |
| Answer» D. 9.8 kN | |
| 3. |
What is the difference between the angle at the nozzle inflection point and the angle at the exit called? |
| A. | Contour angle |
| B. | Divergence angle |
| C. | Semi-divergence angle |
| D. | Turn-back angle |
| Answer» E. | |
| 4. |
Which of the following is not a reason why large divergence angles are allowed in bell-shaped nozzles immediately behind the throat? |
| A. | High relative pressure |
| B. | Large pressure gradient |
| C. | Rapid expansion of the working fluid |
| D. | Supersonic flow |
| Answer» E. | |
| 5. |
How does the divergence angle vary along a bell-shaped nozzle? |
| A. | Sharply increases, then decrease |
| B. | Sharply decreases, then increase |
| C. | Remains constant for a while and then increases |
| D. | Remains constant for a while and then decreases |
| Answer» B. Sharply decreases, then increase | |
| 6. |
Which of the following is a typical optimum divergence angle for a conical nozzle? |
| A. | 10° |
| B. | 30° |
| C. | 40° |
| D. | 60° |
| Answer» C. 40° | |
| 7. |
To which of the following terms can we multiply the nozzle correction factor with? |
| A. | Total thrust |
| B. | Momentum thrust |
| C. | Pressure thrust |
| D. | Pressure ratio |
| Answer» C. Pressure thrust | |
| 8. |
What happens to the theoretical nozzle correction factor as the nozzle angle decreases? |
| A. | Increases |
| B. | Decreases |
| C. | Increases first and then decreases |
| D. | Decreases first and then increases |
| Answer» B. Decreases | |
| 9. |
What is the nozzle correction factor for a conical nozzle angle of 200? |
| A. | 0.992 |
| B. | 0.969 |
| C. | 1.939 |
| D. | 0.939 |
| Answer» B. 0.969 | |
| 10. |
Which of the following is not an objective of a good nozzle configuration? |
| A. | Decrease nozzle inert mass |
| B. | Increase nozzle length |
| C. | Obtain the highest practical specific impulse |
| D. | Decrease nozzle diameter |
| Answer» C. Obtain the highest practical specific impulse | |
| 11. |
Which of the following is permissible in a rocket nozzle? |
| A. | Gaps |
| B. | Smooth edges |
| C. | Holes |
| D. | Protrusions |
| Answer» C. Holes | |
| 12. |
Which of the following is not a reason why the wall surface throughout the nozzle is smooth? |
| A. | Minimize friction |
| B. | Minimize radiation absorption |
| C. | Minimize convective heat transfer |
| D. | Minimize flow velocity |
| Answer» E. | |