MCQOPTIONS
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MCQOPTIONS
This section includes 13 Mcqs, each offering curated multiple-choice questions to sharpen your Aircraft Design knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Activity factor is a measure of _________ |
| A. | the amount of power which is being absorbed by propeller |
| B. | power generated by propeller |
| C. | lift induced drag |
| D. | parasite drag |
| Answer» B. power generated by propeller | |
| 2. |
Inflow ratio is defined as __________ |
| A. | total inflow velocity to tip speed |
| B. | total lift by rotor to the total drag |
| C. | drag to lift ratio |
| D. | propulsive efficiency |
| Answer» B. total lift by rotor to the total drag | |
| 3. |
A propeller is rotating with 20 rps has diameter of 2.5m. Calculate thrust produced by the propeller if thrust coefficient is 0.01. |
| A. | 191.40N |
| B. | 2000kN |
| C. | 1.2MN |
| D. | 190KN |
| Answer» B. 2000kN | |
| 4. |
If slip function of propeller is 0.075 and diameter is 20 ft. then, determine the velocity of propeller. Given n = 25 rps. |
| A. | 37.5 ft/s |
| B. | 40ft/min |
| C. | 128ft |
| D. | 300ft/s<sup>2</sup> |
| Answer» B. 40ft/min | |
| 5. |
Determine thrust of propeller if propeller efficiency is 85%. Propeller is assumed to be operated with 1200 bhp and 350ft/s of velocity. |
| A. | 1602.85 lb |
| B. | 12kN |
| C. | 16789lb |
| D. | 8902lb |
| Answer» B. 12kN | |
| 6. |
Determine the propeller efficiency if propeller velocity is 300ft/s and thrust of 1320 lb. Given bhp is 800. |
| A. | 90% |
| B. | 0.03% |
| C. | 0.895% |
| D. | 0.09% |
| Answer» B. 0.03% | |
| 7. |
What should be the value of speed power coefficient if velocity of propeller is 12 unit and power is 100 unit? Given rps is 25. |
| A. | 1.372 |
| B. | 2.35 |
| C. | 8.97 |
| D. | 9.79 |
| Answer» B. 2.35 | |
| 8. |
Determine the required thrust coefficient to produce thrust of 1000N. Given diameter is 1.2m and n=22 rps. |
| A. | 0.813 |
| B. | 0.1 |
| C. | 0.32 |
| D. | 0.489 |
| Answer» B. 0.1 | |
| 9. |
If a propeller has bhp of 700 and diameter as 1.2 ft. and rotating with 20 rps then, determine power coefficient. Consider sea level density. |
| A. | 15.8 |
| B. | 1.8 |
| C. | 30.2 |
| D. | 40 |
| Answer» B. 1.8 | |
| 10. |
If a propeller has speed of 600 rpm and diameter of 1.2m and velocity of 10m/s. Find advance ratio. |
| A. | 0.83 |
| B. | 0.39 |
| C. | 0.289 |
| D. | 0.1 |
| Answer» B. 0.39 | |
| 11. |
Supercharger is used to improve __________ |
| A. | intake manifold pressure |
| B. | outlet pressure |
| C. | to increase charging capacity of an electric charger |
| D. | expansion of exhaust velocity |
| Answer» B. outlet pressure | |
| 12. |
A piston engine has bhp of 600 at sea level. Now, if engine is operating at an altitude where density ratio is 0.816 then, find the value bhp at that altitude. |
| A. | 37 |
| B. | 89 |
| C. | 100 |
| D. | 289 |
| Answer» B. 89 | |
| 13. |
Mass flow rate will be affected by __________ |
| A. | altitude |
| B. | weight of the aileron |
| C. | induced drag only |
| D. | longerons weight |
| Answer» B. weight of the aileron | |