MCQOPTIONS
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MCQOPTIONS
This section includes 14 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. |
For supersonic jet, C D nozzle is used for the acceleration of exhaust. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2. |
Turbofan engine uses a large fan at inlet to ________ |
| A. | increase efficiency of the engine |
| B. | increase flow velocity |
| C. | increase wing tip lift |
| D. | increase tailplane lift |
| Answer» B. increase flow velocity | |
| 3. |
At low subsonic speed, we should select _________ |
| A. | low bypass Turbofan engine |
| B. | turboprop always |
| C. | always use ram jet |
| D. | subsonic speed cannot be achieved |
| Answer» B. turboprop always | |
| 4. |
Uninstalled engine data is available from __________ |
| A. | manufacturer |
| B. | stability margin |
| C. | thin airfoil theory |
| D. | lifting line theory |
| Answer» B. stability margin | |
| 5. |
What do you mean by overall pressure ratio? |
| A. | Ratio of pressure at engine exhaust and inlet front face |
| B. | Ratio of dynamic to normal pressure |
| C. | Total pressure divided by stagnation pressure |
| D. | Stagnation pressure divided by dynamic pressure |
| Answer» B. Ratio of dynamic to normal pressure | |
| 6. |
What is the limitation of current engine design? |
| A. | Turbine inlet temperature |
| B. | Inlet flow velocity reduction limitation |
| C. | Flow velocity over wing |
| D. | Expansion fan only |
| Answer» B. Inlet flow velocity reduction limitation | |
| 7. |
Which type of engine should be selected, if required cruise speed is above 2.1M? |
| A. | Turbojet |
| B. | Piston |
| C. | Reciprocating |
| D. | Piston propeller |
| Answer» B. Piston | |
| 8. |
Thrust generated by an engine is proportional to mass flow rate. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 9. |
Find the acceptable value of ram drag if Turbojet is designed to provide net thrust of 88% of gross thrust. Engine gross thrust is 12.5KN. |
| A. | 1.5KN |
| B. | 2500 |
| C. | 23456 |
| D. | 4325 |
| Answer» B. 2500 | |
| 10. |
An engine has gross thrust of 150KN. If mentioned designed condition needs to be met is that the ram drag should not exceed more than 18KN then, find the net thrust by engine. |
| A. | 132KN |
| B. | 123N |
| C. | 145 N |
| D. | 345MN |
| Answer» B. 123N | |
| 11. |
Afterburner is used to ________ |
| A. | increase thrust of engine |
| B. | increase fuel efficiency |
| C. | increase lift produced by tail |
| D. | reduce fuel consumption |
| Answer» B. increase fuel efficiency | |
| 12. |
Net thrust is given by ________ |
| A. | gross thrust minus the ram drag |
| B. | drag into velocity |
| C. | gross thrust divided by weight |
| D. | lift to drag ratio |
| Answer» B. drag into velocity | |
| 13. |
Determine thrust power if aircraft velocity is 150 m/s and thrust force is 1000N. |
| A. | 150KW |
| B. | 1500W |
| C. | 12.056MW |
| D. | 0.0 |
| Answer» B. 1500W | |
| 14. |
Propulsive efficiency is defined as _____________ |
| A. | ratio of obtained thrust power to energy expanded |
| B. | thrust used by compressed energy |
| C. | aerodynamic efficiency |
| D. | lift required to thrust required at each segment |
| Answer» B. thrust used by compressed energy | |