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. |
If exhaust pressure is Pe and surrounding fluid pressure is Pa, what is the condition for the optimum expansion ratio of a rocket nozzle? |
| A. | P<sub>e</sub>=P<sub>a</sub> |
| B. | P<sub>e</sub><P<sub>a</sub> |
| C. | P<sub>e</sub>>P<sub>a</sub> |
| D. | P<sub>e</sub>=0.5*P<sub>a</sub> |
| Answer» B. P<sub>e</sub><P<sub>a</sub> | |
| 2. |
Consider a rocket engine A and a jet engine B. Which of them will have higher specific impulse? |
| A. | A |
| B. | B |
| C. | B doesn t have a specific impulse |
| D. | A doesn t have a specific impulse |
| Answer» C. B doesn t have a specific impulse | |
| 3. |
Rocket A has twice the pressure thrust of rocket B while it has half the momentum thrust as that of B. If the momentum thrust of B is 5 times its pressure thrust, find the ratio of total thrust of A to B. |
| A. | 0.5 |
| B. | 0.75 |
| C. | 1 |
| D. | 0.25 |
| Answer» C. 1 | |
| 4. |
A rocket has a throat area of 10 mm2 and nozzle exit area of 25 mm2. If the mass flow rate of its propellants is 2 kg/s, exit velocity is 30 m/s, and if exit pressure is twice the standard atmospheric pressure at sea level, what will be the total thrust? |
| A. | 60 N |
| B. | 62.53 N |
| C. | 61.26 N |
| D. | 65.06 N |
| Answer» C. 61.26 N | |
| 5. |
How does the total thrust vary with an extendable nozzle? |
| A. | First increases, then decrease |
| B. | First decreases, then increase |
| C. | Keeps on increasing |
| D. | Keeps on decreasing |
| Answer» B. First decreases, then increase | |
| 6. |
The rocket nozzle is usually so designed such that the exhaust pressure is ____ the ambient fluid pressure. |
| A. | greater than |
| B. | less than |
| C. | equal to |
| D. | equal to or slightly higher than |
| Answer» E. | |
| 7. |
What will happen to thrust and specific impulse as the rocket is propelled to higher altitudes? |
| A. | Thrust decreases, specific impulse increases |
| B. | Thrust increases, specific impulse increases |
| C. | Thrust decreases, specific impulse decreases |
| D. | Thrust increases, specific impulse decreases |
| Answer» C. Thrust decreases, specific impulse decreases | |
| 8. |
If Pe represents exit pressure and Pa represents the atmospheric pressure, what is the condition for a nozzle to be overexpanded? |
| A. | P<sub>e</sub> < P<sub>a</sub> |
| B. | P<sub>e</sub> > P<sub>a</sub> |
| C. | P<sub>e</sub> = P<sub>a</sub> |
| D. | P<sub>e</sub> = 0.5*P<sub>a</sub> |
| Answer» B. P<sub>e</sub> > P<sub>a</sub> | |
| 9. |
In the expression of pressure thrust, what does the area (A) represent? |
| A. | The cross-sectional area of the throat |
| B. | The total surface area of the rocket casing |
| C. | The cross-sectional area of the nozzle exit |
| D. | The total surface area of the combustion chamber |
| Answer» D. The total surface area of the combustion chamber | |
| 10. |
If the exit pressure is thrice the atmospheric pressure for a rocket A and if it is twice for rocket B, what will be the ratio of pressure thrust of rocket A to that of B? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |