MCQOPTIONS
Saved Bookmarks
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. |
Find the actual mass flow rate for a discharge correction factor ( d) of 1.15. For an ideal nozzle of same design and initial state, the following information is given: Volume flow rate (Q) = 0.53 m3/s; static temperature (T) = 590 K; static pressure (P) = 0.15 MPa; R = 287 J/kg/K. |
| A. | 0.47 |
| B. | 0.88 |
| C. | 0.28 |
| D. | 0.54 |
| Answer» E. | |
| 2. |
Determine the velocity correction factor ( v) if the energy conversion efficiency is 0.94. |
| A. | 0.97 |
| B. | 0.85 |
| C. | 0.92 |
| D. | 0.99 |
| Answer» B. 0.85 | |
| 3. |
Which of the following terms denote the ratio of kinetic energy per unit flow of the actual jet leaving the nozzle to that of a hypothetical ideal one with the same working substance, initial state and exit pressure as that of the actual exhaust jet? |
| A. | Velocity correction factor ( <sub>v</sub>) |
| B. | Discharge correction factor ( <sub>d</sub>) |
| C. | Thrust correlation factor ( <sub>F</sub>) |
| D. | Energy efficiency factor (e) |
| Answer» E. | |
| 4. |
Which of the following is not correct for transient periods when compared to steady periods of rocket operation? |
| A. | Lower average thrust |
| B. | Higher chamber pressure |
| C. | Lower specific impulse |
| D. | Higher velocity variations |
| Answer» C. Lower specific impulse | |
| 5. |
How do the characteristic velocity (c) and the specific impulse (Isp) vary as particle fraction is increased? |
| A. | Both Isp and c decreases |
| B. | Both Isp and c increases |
| C. | Isp decreases, c increases |
| D. | Isp increases, c decreases |
| Answer» B. Both Isp and c increases | |
| 6. |
Which of the following is the correct expression for particle fraction ? Given: Total mass = mT, mass of the particles = mp. |
| A. | m<sub>T</sub>/m<sub>p</sub> + m<sub>T</sub> |
| B. | m<sub>p</sub>/m<sub>p</sub> + m<sub>T</sub> |
| C. | m<sub>p</sub>/m<sub>T</sub> |
| D. | m<sub>T</sub>/m<sub>p</sub> |
| Answer» D. m<sub>T</sub>/m<sub>p</sub> | |
| 7. |
What happens to the solid particles in multiphase flow at the nozzle exit when the size of the particles increases? |
| A. | Lower momentum and lower thermal energy |
| B. | Higher momentum and lower thermal energy |
| C. | Lower momentum and higher thermal energy |
| D. | Higher momentum and higher thermal energy |
| Answer» D. Higher momentum and higher thermal energy | |
| 8. |
In which of the following cases is the effect of the boundary layer more pronounced? |
| A. | Longer nozzles with high area ratios |
| B. | Shorter nozzles with high area ratios |
| C. | Longer nozzles with low area ratios |
| D. | Shorter nozzles with low area ratios |
| Answer» B. Shorter nozzles with high area ratios | |
| 9. |
In a boundary layer flow along with the nozzle, why is the layer closest to the wall cooler? |
| A. | Flow velocity is minimum; Low energy flow leads to less temperature |
| B. | Heat transfer to the walls |
| C. | Radial heat propagation from the nozzle axis is a very slow process |
| D. | Mass flow rate closer to the nozzle axis is maximum |
| Answer» C. Radial heat propagation from the nozzle axis is a very slow process | |
| 10. |
For an asymmetric nozzle section of diameter 12 cm, determine the average value of flow velocity if the velocity distribution is of the form v2 = (2r 3r2) x 104 m/s, where r denotes the radial location in the cross-section plane. |
| A. | 1104.4 m/s |
| B. | 765.4 m/s |
| C. | 891.4 m/s |
| D. | 404 m/s |
| Answer» C. 891.4 m/s | |