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. |
Which of the following is not a feature of the combustion chamber in an ideal chemical rocket engine? |
| A. | High pressure |
| B. | High temperature |
| C. | Low flow velocity |
| D. | Higher transient time |
| Answer» E. | |
| 2. |
Find the propellant mass fraction for a rocket having a structural mass of 150 kg, a payload mass of 20 kg and propellant mass of 1000 kg. |
| A. | 0.65 |
| B. | 0.85 |
| C. | 0.95 |
| D. | 0.45 |
| Answer» C. 0.95 | |
| 3. |
Which of the following is a reasonable depiction of the mass distribution in practical chemical rockets? |
| A. | 50% propellants, 50% inert mass |
| B. | 10% propellants 90% inert mass |
| C. | 90% propellants 10% inert mass |
| D. | 40% propellants 60% inert mass |
| Answer» D. 40% propellants 60% inert mass | |
| 4. |
For typical real rocket engines, what is the approximate amount of energy lost (from the available energy pool) due to heat transfer to the walls of the rocket? |
| A. | 1% |
| B. | 10% |
| C. | 5% |
| D. | 15% |
| Answer» B. 10% | |
| 5. |
Which of the following relations won t hold in an ideal rocket engine s nozzle? |
| A. | Isentropic expansion relations |
| B. | Conductive heat transfer relations |
| C. | Homogeneous flow relations |
| D. | Ideal gas law relations |
| Answer» C. Homogeneous flow relations | |
| 6. |
Select the correct option for an ideal rocket engine. |
| A. | The exhaust gases leaving the rocket need not be axially directed |
| B. | Across any cross-section normal to the nozzle axis, gas velocity need not be uniform |
| C. | The gas composition can vary across the nozzle |
| D. | Cryogenic propellants need to be stored at their boiling points |
| Answer» E. | |
| 7. |
Which of the following statements is correct for an ideal rocket? |
| A. | All kinds of frictional effects are not present, but the boundary layer cannot be neglected |
| B. | All discontinuities are not present, but shock waves are allowable |
| C. | Propellant flow is steady but constant |
| D. | The expansion of the working fluid is steady, but need not be uniform |
| Answer» D. The expansion of the working fluid is steady, but need not be uniform | |
| 8. |
An ideal rocket has a chamber pressure of 1 MPa and a temperature of 1600 K. Determine the density of the combustion product if its molecular mass is 24 kg/kmol. |
| A. | 1.2 kg/m<sup>3</sup> |
| B. | 2.4 kg/m<sup>3</sup> |
| C. | 1.8 kg/m<sup>3</sup> |
| D. | 3.6 kg/m<sup>3</sup> |
| Answer» D. 3.6 kg/m<sup>3</sup> | |
| 9. |
What is the allowable amount of heat (in % of total available energy) that can be transferred across the walls of an ideal rocket? |
| A. | 0% |
| B. | 10% |
| C. | 15% |
| D. | 5% |
| Answer» B. 10% | |
| 10. |
For an ideal rocket, what should be the nature of the working substance? |
| A. | Homogeneous |
| B. | Heterogeneous |
| C. | Anisotropic |
| D. | Amorphous |
| Answer» B. Heterogeneous | |