Aeronautical Quiz

8/10/2019 Aeronautical Quiz

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Stress Engineers Quiz

pen and paper only: no calculators, phones or laptopsMarks /70

1. The early model Boeing 747 aircraft featured a design that is no longer found in other

commercial aircraft. What is it?

a) 1950s Diner type restaurant b) Small, chlorine free, swimming pool c) Spiral staircase d)Parachutes for all 1 st class passengers and crew

2. A guillotine must shear a sheet of metal 0.6m wide and 3mm thick. The ultimate shear stressis 51.5MPa. Estimate the force required. a) 80kN b) 90kN c) 100Kn d) 70kN

3. In terms of engineering software, what does CAD stand for?

4. Whos the famous aviator? a) Howard Hughs b) Charles Lindbergh c) LouisBleriot d) Jimmy Doolittle e) James Stewart

5. On an aerospace drawing if you cannot find the material in the title block; where can you findit? a) notes b) parts list bill of materials c) assembly drawing d) installation drawing

6. The neutral axis of the cross-section of a beam is that axis which the bending stress is:

a) zero b) maximum c) minimum d) infinity

7. A vertical column has two moments of inertia (i.e. I xx and I yy ). The column will tend tobuckle in the direction of the a) axis of load b) perpendicular to the axis of load c) maximum moment of inertia d)

minimum moment of inertia.

8. What does NASA stand for?a) North American Space Agency b) National Aeronautics and Space Administration c)

National Academy (for) Space Advancement d) National Aeronautical and Space Agency

9. In the below figure, the point E represents the maximum stress. True / False?


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10. For a beam, as shown in the below figure, when the load W is applied in the centre ofthe beam, the maximum moment is :

Wa/6, Wb/8, Wl/4, W(a+b)/8

11. A simply supported beam ' A ' of length l , breadth b and depth d carries a central loadW . Another beam ' B ' of the same dimensions carries a central load equal to 2 W . Thedeflection of beam ' B ' will be __________ as that of beam ' A '.

a) One-fourth b) one-half c) double d) four times

12. Rivets and bolts are generally specified by:

a) Thickness of plates to be joined b) overall length c) shank diameter d) diameter ofthe head

13. Moment of inertia of a hollow circular section, as shown in the below figure aboutX -axis, is


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14. The property of a material due to which it breaks with little permanent distortion, iscalled: a) brittleness b) malleability c) ductility d) plasticity

15. Who was the first US President to fly (either in, or out of office) a) John QuincyAdams b) Theodore Roosevelt c) William Howard Taft d) Woodrow Wilson e) JamesKnox Polk

16. A cantilever beam has a square cross section of 100mm2 and length 2m. There is apoint load at the tip of 500N acting down and a tensile load of 10,000N acting alongthe line of the beam at the tip. What is the maximum value of tensile stress developedin the beam? a) 5900MPa b) 6100MPa c) 6000MPa d) 6050MPa

Is this value rational? Give your reasons.

17. An error 2% in excess is made while measuring the side of a square beam. Thepercentage of error in the calculated area of the square is:a) 2% b) 4.04% c) 4% d) 2.02%

18.


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19. What is the aircraft? a) DC -9 b) VC10 (Super)c) B66 Destroyer d) Gypsy Moth

20. A truss in a wing is 20mm diameter, and 10m long. It is subject to a tensile load of300kN. E =200GN/m2. Estimate the elongation a) 5mm b) 50mm c)75mm d) 25mm

21. Whats the difference between Reserve Factor (RF) and Margin of Safety (MoS)?a) Reserve Factor only applies to static calculations b) 1 c) about 50% d) There is nodifference.

22. Which one of the following failure modes is not normally checked for a lugcalculation? a) buckling b) shear-out c) tension d) bearing

23. A lug is 5mm thick and has a hole of diameter 10mm for the installation of a bolt.What is the bearing stress if the applied load is 10,000N (a) 200MPa b) 300MPa c)400MPa d) 2000MPa

24. Consider a symmetrical I beam; height 80mm, width 60mm, thicknesses of allflanges and webs 10mm. Calculate Ixx :

a) 176cm4 b) 166cm4 c) 246cm4 d) 208cm4

25. By weight what % composites are on the 787? a) 50% b) 60% c) 70% d) 25%

26. What diameter is a #9 bolt? a) 14.28mm b) 11.11mm c) 9.53mm d) none of these

27. Whos this? a) Galileo b) Leonardo da Vinci c) Sir IsaacNewton d) Michelangelo e) my x-girlfriend

28. The region in the stress-strain curve extending from the origin to proportionallimit is called (a) plastic range (b) elastic range (c) semi plastic range (d) semi elasticrange
http://www.airliners.net/open.file?id=2387084http://www.airliners.net/open.file?id=2387084


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38. Consider a cantilever beam with a vertical point load applied at the free end. Which twoquantities vanish at the fixed end of the beam? a) bending moment and transverse shear b)deflection and bending moment c) deflection and transverse shear d) deflection and slope

39. The process by which an engineer constructs a mathematical model of a physical systemis called: (a) idealization b) fabrication c) validation d) verification e) divination

40. Which former Russian president had a degree in Civil Engineering (1955 - Ural KirovPolytechnic) - a) Boris Yeltsin b) Nita Khrushchev c) Mikhail Gorbachev d) Leonid Brezhnev

41. Enlarging a hole by a reasonable amount is called: a) reaming b) boring [the operation; notthe word dull aka the X factor ] c) countersinking d) drilling

42. Approximately how many military aircraft were produced by the UK during World WarII? a) 8 b) 75,000 c)130,000 d)200,000

43. In the field of aircraft fatigue life measurement, OLM is commonly used as an acronymfor?: a) Ordinary Load Measure b) Operational Load Measurement c) On Line Maintenance d)Optical Link Modules

44. What would be the approximate value in MPa for the endurance (fatigue threshold) ofun-notched aluminium alloy? a) 10MPa b) 130MPa c) 300MPa d) 100ksi

45. Which city is served by Schiphol Airport? a) Frankfurt b) Geneva c) Amsterdam d)Warsaw e) Cherating

46. What structure is this description relevant to?

They are hinged on the wings and move downward to push the air down and make the wingtilt up. a) elevators b) ailerons c) spoilers d) fw d passenger door

47. What was the DeHavilland Comet? a) Worlds first passenger jet b) VTOL ; but subsonicc) first pressurised bomber d) most popular commercial passenger jet e) Edmond Halley sflat mates first astronomical observance

48. In the equation for lift generated by an aircraft aerofoil section; lift is proportional toa) density squared b) wing area c) speed d) speed squared.

49. All of these are advantages of having a two spar wing, as opposed to a one spar wingexcept:

a) The rear spar of a two spar wing is more convenient for mounting control surfaces b) Thetorsion box formed by a two spar wing encloses a larger area than the leading edge D cell ina single spar wing. This should give the two spar wing an advantage in greater polar momentof inertia for less weight and should enable it to optimize the reaction of torque loads c)there is more room for storage of fuel d) there are potentially fewer fasteners, bolts andbrackets etc.


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50. Stress Engineers are: a) Intelligent b) Funny c) Attractive d) All of these e) None ofthese.

Marks:

Questions which attract 1 mark: 1, 3, 4, 6, 7, 8, 9, 11, 12, 13, 14, 15, 17, 19, 21, 22, 25, 26,27, 28, 29, 30, 32, 36, 37, 39, 40, 41, 42, 43, 45, 46, 47, 48, 49, 50

Questions which attract 2 marks: 2, 5, 10, 18, 23, 33, 34, 35, 38, 44

Questions which attract 3 marks: 16, 20, 24 Question which attracts 5 marks : 31

Happy Holidays

Guy Little

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Aeronautical Quiz