GTU BE/B.Tech 2019 Winter Question Papers || Gujarat Technological University
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Subject Code: 2150103
BE - SEMESTER- V (New) EXAMINATION — WINTER 2019
Subject Name: Aircraft Structures II
Time: 10:30 AM TO 01:00 PM
Instructions:
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- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
| Q.1 | Clearly explain the loads acting on an aircraft for different flight conditions with neat sketches. | MARKS | 03 |
| Q.2 | Discuss about the failures occur in structural components of aircraft for different flight conditions. | 04 | |
| Q.3 | Briefly explain about the load bearing members of wing, fuselage and empennage section with neat sketches | 07 | |
| Q.3 | Define Shear Centre and Shear Flow. | 03 | |
| Q4 | What do you understand by the term buckling of a structure? Give an example of an aircraft structural component prone to buckling. | 04 | |
| Q4 | How the structure of civil aircraft is different from fighter aircraft? Discuss using critical points. | 07 | |
| OR | |||
| A simply supported beam has a central point load of W. Determine the deflection curve and the maximum deflection if the beam is doubly symmetric. | 07 | ||
| QS5 | Define Stiffness and state the characteristics of Stiffness Matrix. | 03 | |
| QS5 | Explain with neat sketch the state of stress at a point in three dimensions | 04 | |
| Derive the equation of torque for a bar from Prandtl stress function | 07 | ||
| OR | |||
| Enlist the different ways of making the section free from torsion. | 03 | ||
| Describe the difference between Symmetrical Bending and Unsymmetrical Bending? | 04 | ||
| What is the need of V-n diagram? Explain using neat sketch. | 07 | ||
| Define Principal Centroidal Axis. | 03 | ||
| What are the different cross sections that can be used in spar of a wing? Which one is most preferable and why? | 04 | ||
| Explain torsion of multi cell open section beams. | 07 | ||
| OR | |||
| Define neutral axis. | 03 | ||
| Enlist the basic equations of equilibrium, compatibility and stress strain relations for plane stress condition in polar coordinate system. | 04 | ||
| Explain torsion of multi cell closed section beams. | 07 | ||
| Explain St Venant’s principle. | 03 | ||
| Describe principle moment of inertia. | 04 | ||
| Derive the equations for direct bending stress distribution. Also sketch the direct bending stress distribution of an I-section. | 07 | ||
| OR | |||
| What do you mean by in plane stress and out of plane stress? | 03 | ||
| Prove that ‘Stiffness matrix and Flexibility matrix are inverse to one another’. | 04 | ||
| What is redundancy? Explain its significance with suitable example of aircraft structure. | 07 | ||
Date: 04/12/2019
Total Marks: 70
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