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51.	The highest compression load which will not cause the elastic column buckling is called _________(a) euler load(b) bernoulli’s theorem(c) newtonian fluid(d) divergenceThe question was asked in an interview for internship.The query is from Structural-Analysis Fundamentals topic in portion Structures and Loads of Aircraft Design
Answer» Right choice is (a) euler load The EXPLANATION: Euler load is defined as the highest COMPRESSION load which will not cause the elastic COLUMN buckling. Euler load is also termed as critical load. Bernoulli’s theorem is used for fluids. Newtonian fluid are those fluids which FOLLOW the NEWTON’s law of viscosity.

52.	Column is supported by pin at both the ends and has length of 10 unit. If radius of gyration is 3.16 unit then find slenderness ratio.(a) 3.16(b) 2.13(c) 5.67(d) 0.56I had been asked this question during an interview.I would like to ask this question from Structural-Analysis Fundamentals in division Structures and Loads of Aircraft Design
Answer» Correct CHOICE is (a) 3.16 To elaborate: Given, column is SUPPORTED by PIN at both the end. Now, slenderness ratio = effective LENGTH/ radius of gyration = 10/3.16 = 3.16.

53.	An object has direct stress and direct strain of 250Pa and 0.015 respectively. Determine the Young’s modulus.(a) 16.6 KPa(b) 177Pa(c) 2345Pa(d) 1265KPaThis question was addressed to me during an interview.My question is based upon Structures Fundamentals in chapter Structures and Loads of Aircraft Design
Answer» Correct ANSWER is (a) 16.6 KPa The BEST EXPLANATION: YOUNG’s modulus = stress/strain = 250/0.015 = 16.6 KPa.

54.	What are the ground loads?(a) Loads acting due to aircraft motion on ground(b) Air loads(c) Gust loads(d) Lift and dragThis question was posed to me by my college professor while I was bunking the class.I need to ask this question from Loads Categories in section Structures and Loads of Aircraft Design
Answer» Right CHOICE is (a) Loads acting DUE to aircraft motion on ground The best explanation: Loads that are acting due to aircraft motion on the ground is termed as ground loads. Air loads and gust loads are loads acting during the FLIGHT phase. Lift and DRAG are Aerodynamic forces acting on the aircraft. Lift is responsible for lifting the aircraft and drag is a resistive FORCE.

55.	Determine Shear stress produced by material if shear force is 180Pa and area is 20m^2.(a) 9 Pa(b) 10.987 Pa(c) 23.43(d) 12.55The question was asked during an interview.Question is from Structures Fundamentals in chapter Structures and Loads of Aircraft Design
Answer» Correct choice is (a) 9 PA Easiest explanation: SHEAR STRESS = shear FORCE / area = 180/20 = 9 Pa.

56.	Following diagram represents _________(a) fiber reinforced polymer(b) fiber reinforced nitrate only(c) matrix arrangement only(d) magnesium arrangementThe question was posed to me in homework.The origin of the question is Structures topic in portion Structures and Loads of Aircraft Design
Answer» The CORRECT option is (a) FIBER REINFORCED polymer For explanation I would say: A typical Fiber reinforced polymer is shown in the diagram. It is also called filament reinforced COMPOSITE. Most of the aircraft structure are MADE of the frp composite. They provide much better strength to weight ratio.

57.	A rectangular section has b of 2m and h of 5m. Find centroid coordinates.(a) (1, 2.5)(b) (3, 0)(c) (4, 2)(d) (2, 4.8)This question was posed to me by my college professor while I was bunking the class.I'd like to ask this question from Structural-Analysis Fundamentals topic in portion Structures and Loads of Aircraft Design
Answer» RIGHT CHOICE is (a) (1, 2.5) EASY EXPLANATION: For rectangle, centroid coordinates = (b/2, h/2) = (2/2, 5/2) = (1, 2.5).