MCQOPTIONS
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MCQOPTIONS
This section includes 10 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. |
What is stay time? |
| A. | Average time spent by each molecule or atom within the combustion chamber volume |
| B. | Average time spent by each molecule or atom within the thrust chamber volume |
| C. | Average time spent by each molecule or atom within the propellant tank after rocket take off |
| D. | Average time spent by each molecule or atom within the injector manifold |
| Answer» B. Average time spent by each molecule or atom within the thrust chamber volume | |
| 2. |
Typical values of L* for several bipropellants lie between __________ |
| A. | 0.8 and 3 m |
| B. | 1 and 2 m |
| C. | 1.5 and 5.5 m |
| D. | 3.2 and 6.4 m |
| Answer» B. 1 and 2 m | |
| 3. |
Determine the chamber volume if the characteristic length of a thrust chamber is 150 cm and nozzle throat area is 0.25m2. |
| A. | 0.573 m3 |
| B. | 0.735 m3 |
| C. | 0.375 m3 |
| D. | 0.753 m3 |
| Answer» D. 0.753 m3 | |
| 4. |
What is characteristic chamber length? |
| A. | Thrust chamber length without the length of the nozzle |
| B. | Length of the thrust chamber as if it were a straight tube with no converging section |
| C. | Total length of the nozzle |
| D. | Total length of the rocket engine |
| Answer» C. Total length of the nozzle | |
| 5. |
For increased operating chamber pressure, the length of the combustion chamber ________ and the nozzle throat area _________ if the diameter of the combustion chamber (assume the shape to be cylindrical) is fixed and the thrust remains constant. |
| A. | increases; decreases |
| B. | decreases; increases |
| C. | decreases; decreases |
| D. | increases; increases |
| Answer» D. increases; increases | |
| 6. |
The combustion chamber mass is not a function of __________ |
| A. | payload mass |
| B. | method of cooling |
| C. | chamber pressure |
| D. | nozzle area ratio |
| Answer» B. method of cooling | |
| 7. |
Which of the following is true for combustion chambers with large volume and diameter? |
| A. | High heat transfer rates to the walls |
| B. | Smaller total area exposed to the heat |
| C. | Thinner walls |
| D. | Lower wall temperature |
| Answer» E. | |
| 8. |
Which of the following will aid in the selection of smaller combustion chamber volume during its design? |
| A. | Slightly reactive propellants |
| B. | Low chamber pressure |
| C. | Injectors with moderate mixing |
| D. | Possibility for complete combustion |
| Answer» E. | |
| 9. |
The volume of the combustion chamber is selected on the basis of which of these factors? |
| A. | Mixing, evaporation and complete combustion of the propellants |
| B. | Mixing and complete combustion of the propellants, but not its evaporation |
| C. | Evaporation and complete combustion of the propellants, but not mixing |
| D. | Mixing and evaporation but not the complete combustion of the propellants |
| Answer» B. Mixing and complete combustion of the propellants, but not its evaporation | |
| 10. |
Burning of the propellants take place in __________ |
| A. | nozzle |
| B. | injector |
| C. | combustion chamber |
| D. | engine casing |
| Answer» D. engine casing | |