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Aircraft Design Practice Test: Initial Sizing
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Avg score: 3% • Most missed: “Size of fixed engine can vary during sizing.”
Initial Sizing topics include: Rubber engine sizing, fixed engine sizing, geometry and control surface sizing. Initial sizing is the first step in aircraft design. It defines the rough size and weight of an aircraft based on its intended requirements. Initial sizing includes: Weight and volume estimations Constraint analysis for the thrust-to-weight ratio Wing loading Visual analysis of the available design space with respect to performance constraints Selection of the optimum design point (P/W and W/S) and the corresponding HP Engine characteristics and aerodynamic... Show more
Aircraft Design Practice Test: Initial Sizing
Time left 00:00
25 Questions

1. Rapid oscillations of control surface due to application of the air loads is termed as __________
2. Determine the corrections or otherwise of the following assertion [A] and reason [R]:
Assertion [A]: Typically control surface are tapered with same taper ratio as primary component such as wing or tail
Reason[R]: Control surface is used to provide trim control to the A/C
3. If a wing has span of 12m. Find the approximated length of the aileron of starboard wing.
4. For a given rubber engine, determine fuel burn at combat if combat time is 2.5min.
5. Which of the following is correct?
6. The rubber engine can be sized for any thrust so we can have desired thrust loading.
7. As weight varies, rubber engine _______
8. We can provide sizing based on new design only.
9. An aircraft is flying with fuselage having length of 1.5m and fineness ratio of 15. At which maximum diameter fuselage should be designed?
10. Fixed engine sizing method is adopted for aircraft. If thrust per engine is 20000 unit and thrust loading T.L. is 0.8 then, find the take-off gross weight. Given aircraft has 2 engines.
11. Which of the following is correct?
12. We can reduce aileron reversal by adopting ____________
13. Process of determining the take-off gross weight and required fuel weight is called as ________
14. Size of fixed engine can vary during sizing.
15. As a designer let’s consider that we want to build an aircraft weighing 28000 units at take-off. How many engine will require if our thrust loading T.L. is 0.71 and thrust per engine is 10000 unit?
16. Which of the following is disadvantage of fixed engine sizing?
17. For mission with payload drop, the take-off gross weight W0 is given by ____
18. If vertical tail has length of the 2m then, find the value of rudder length.
19. Find the wing reference area if wing loading is 85 lb/ft2 and aircraft has gross weight of 10000 lb.
20. Following diagram represents ______
Following diagram represents _____
"Determine elevator chord if tail chord is 1m."
21. A jet fighter is designed to operate at maximum mach of 2.0. Which of the following is approximated value for empty weight fraction if rubber engine sizing is used? Given, W0 = 20000lb, AR = 5, thrust loading T.L. = 0.6 and wing loading W.L. is 25.
22. Fineness ratio of fuselage is ratio of _____________
23. An aircraft is climbing and accelerating to reach the cruise mach number of 0.75. If aircraft is accelerating from 0.1M then, what will be the mission segment fuel fraction for this mission?
24. Based on existing engine or based on new design, aircraft sizing can be done.
25. The purpose of fuselage is ___________

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