AE 6702 Experimental Stress Analysis, Final year, Department of Aeronautical Engineering, Model Exam Questions
Answer ALL Questions
PART A – (10 x 2 = 20 Marks)
1. Define Sensitivity. What is cross sensitivity?
2. What are the requirements of strain gauge materials?
3. What are the methods are available for computing the strain rosette data’s?
4. State Stress Optics Law.
5. What are the basic principles of Photo elasticity?
6. What are the advantages of Brittle Coating?
7. Define Stress Coat.
8. What are the principles of Eddy Current Testing?
9. Give the most commonly used methods for compensation techniques.
10. What is NDT? Give its advantages.
PART - B (5 × 16 = 80 marks)
11. (a) (i) Explain with a neat sketch of Huggen Berger Extensometer and mention its advantage .(8)
(ii) Explain the construction & working of Acoustical Strain gauge. (8)
Or
(b) (i) Explain with a neat sketch of Marten’s mirror Strain gauge. (8)
(ii) Write Short notes on Inductance and Whittemore Strain gauge (8)
12. (a)(i) For a delta rosette on a steel specimen ϵa = -600 x 10-6, ϵb = 300 x 10-6, ϵc = 400 x 10-6. Determine the principal strains, principal stresses and directions. Take E = 210 Gpa, ϒ=0.30 (8)
(ii) Explain temperature compensation techniques (8)
Or
(b) (i) Derive an expression for change in output voltage of an unbalanced wheat stone bridge circuit in terms of the changes in resistance. (8)
(ii) Rectangular strain rosette mounted on aluminum for each young’s modulus E=70GPa
ϒ=0.32, ϵa=285*10-6, ϵb=65*10-6, ϵc=102*10-6.
Determine the principle stress, principle direction and maximum shear stress. (8)
13. (a) (i) Explain Fringe sharpening. (8)
(ii) Explain Fringe multiplication technique used in Photo elasticity. (8) Or
(b) Sketch the Circular Polariscope and explain the effects of a stressed model and the fringes obtained on it. (16)
14. (a) (i) Explain with a neat Sketch of holography. (8)
(ii) Explain Brittle Coating. (8) Or
(b) (i) Explain Moire Technique (8)
(ii) Derive the relation between the stress in coating and in model (8)
15. (a) Explain with a neat sketch for the following NDT processes with Merits, Demerits and Applications.
(i) Ultrasonic testing (8)
(ii) Radiographic Testing (8)
Or (b)
(i) Magnetic Particle Testing (8)
(ii) Acoustic Emission Testing (8)
Answer ALL Questions
PART A – (10 x 2 = 20 Marks)
1. Define Sensitivity. What is cross sensitivity?
2. What are the requirements of strain gauge materials?
3. What are the methods are available for computing the strain rosette data’s?
4. State Stress Optics Law.
5. What are the basic principles of Photo elasticity?
6. What are the advantages of Brittle Coating?
7. Define Stress Coat.
8. What are the principles of Eddy Current Testing?
9. Give the most commonly used methods for compensation techniques.
10. What is NDT? Give its advantages.
PART - B (5 × 16 = 80 marks)
11. (a) (i) Explain with a neat sketch of Huggen Berger Extensometer and mention its advantage .(8)
(ii) Explain the construction & working of Acoustical Strain gauge. (8)
Or
(b) (i) Explain with a neat sketch of Marten’s mirror Strain gauge. (8)
(ii) Write Short notes on Inductance and Whittemore Strain gauge (8)
12. (a)(i) For a delta rosette on a steel specimen ϵa = -600 x 10-6, ϵb = 300 x 10-6, ϵc = 400 x 10-6. Determine the principal strains, principal stresses and directions. Take E = 210 Gpa, ϒ=0.30 (8)
(ii) Explain temperature compensation techniques (8)
Or
(b) (i) Derive an expression for change in output voltage of an unbalanced wheat stone bridge circuit in terms of the changes in resistance. (8)
(ii) Rectangular strain rosette mounted on aluminum for each young’s modulus E=70GPa
ϒ=0.32, ϵa=285*10-6, ϵb=65*10-6, ϵc=102*10-6.
Determine the principle stress, principle direction and maximum shear stress. (8)
13. (a) (i) Explain Fringe sharpening. (8)
(ii) Explain Fringe multiplication technique used in Photo elasticity. (8) Or
(b) Sketch the Circular Polariscope and explain the effects of a stressed model and the fringes obtained on it. (16)
14. (a) (i) Explain with a neat Sketch of holography. (8)
(ii) Explain Brittle Coating. (8) Or
(b) (i) Explain Moire Technique (8)
(ii) Derive the relation between the stress in coating and in model (8)
15. (a) Explain with a neat sketch for the following NDT processes with Merits, Demerits and Applications.
(i) Ultrasonic testing (8)
(ii) Radiographic Testing (8)
Or (b)
(i) Magnetic Particle Testing (8)
(ii) Acoustic Emission Testing (8)
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