Experiment Stress Analysis (ESA) Important Question for Examination preparation

1. Experimental Stress Analysis
QUESTION BANK
Module-I
Part –A
1. Explain with neat block diagram generalized measurement system with example.
2. Define the following with example (i) Standards, (ii) Calibration, (iii) Dimensions and
units.
3. Explain the concept of dynamic measurement system.
Or
Explain the following (i) System response, (ii) Impedance matching, (iii) Distortion.
4. Explain the analysis of experimental data.
5. Explain the types of causes of experimental errors.
6. Explain the general consideration in data analysis.
Part-B
7. Define Gauge factor? Drive an experiment for gauge factor
8. What are the various factors to be considered before selecting a gauge?
9. Write the advantages of Foil type strain gauge over Wire type strain gauge?
10. What is meant by temperature compensation? and explain.
Or
What is the necessity of temperature compensation? How this can be achieved?
11. Briefly explain performance characteristics of electrical resistance strain gauge.
12. Drive relationship between strain sensitivity and gauge factor.
13. Describe gauge construction and mounting technique of electrical resistance foil
gauge.
14. Describe factors influencing for gauge, baking and adhesive materials of electrical
resistance strain gauge.
15. Drive governing equation for Wheatstone bridge circuits.
16. Drive governing equation for potentiometer bridge circuits.

2. Experimental Stress Analysis
Module– II
Part-A
1. What do you understand by a strain rosette? What are the different types of strain
rosette configurations currently in use? Discuss their uses and limitations.
2. Explain with neat sketch two element rectangular rosettes.
3. Explain with neat sketch three element rectangular rosettes.
Or
Describe the three element rectangular rosettes and their Correction for transverse
strain effects
4. Describe the three element delta rosettes and their Correction for transverse strain
effects
Or
Explain with neat sketch three element delta rosettes.
5. A two element rectangular rosette is used to determine the two principal stresses at a
point if  1 = 860 um/m and 2 = -390 urn/rn. Find  xxand  yy. Assume Young's
modulus E = 207 GPa and Poisson's ratio as 0.3.
6. A three element strain rosette is bonded onto the surface of a specimen for strain
measurement, strain gage A is along X-axis and strain gages Band C are oriented
along directions at angles 1200
and 2400
from X - axis in anticlockwise direction.
When the specimen is loaded the strain gages yields the following strains 0= +500
um/rn, 120 = -250 um/m and 240 = 250 um/rn. Given K, = -0.07 and Vo = 0.285.
Determine the magnitude and directions of principal strains at the point where the
strain rosette is bonded.
Part-B
7. Explain the mass balance measurement system with a neat sketch
8. Explain elastic element for force measurements.
Or
Explain the force transducer with and example.
9. Explain the torque measurement system.
Or
Explain the torque transducer with and example.

3. Experimental Stress Analysis
Module – III
Part-A Photoelasticity
1. Explain nature of light, polarization and types of polarization.
2. Define stress optic law and drive it.
3. Define isoclinics and isochromatics.
4. What do you mean by compensation technique?
5. What is the necessity of calibration of a photoelastic material? Explain calibration of a
photoelastic model under diametrical compression.
Or
List calibrations methods used in photoelasticity? Explain any two methods.
6. Why Tardy’s method of compensation is preferred over all other methods?
7. Sketch a circular polariscope. Explain the effects of a stressed model and the fringes
obtained in it
8. Sketch a plain polariscope. Explain the effects of a stressed model and the fringes
obtained in it.
Part-B 2D Photoelasticity
9. List Separation methods and Explain Shear difference method and Analytical
separation methods.
10. Describe Shear difference method clearly
11. Explain briefly Model to prototype scaling,
12. List and explain Properties of 2D photo-elastic model materials,
13. List the Materials used for 2D photoelasticity? Explain it
14. What are the important properties of an ideal photoelastic material?

4. Experimental Stress Analysis
Module – IV
Part-A 3D Photoelasticity
1. Describe three dimensional photoelasticity give an example.
2. Describe Stress freezing method with a neat sketch give an example.
3. Define Scattering of light? Explain scattered light in photoelastic model
4. Explain clearly Scattered light as an interior analyzer and polarizer with neat sketch.
5. With neat line diagram, explain the Scattered light polariscope and stress data
analyses.
6. Explain with a neat sketch the phenomenon of scattered light photoelasticity.
Part-B Birefringent coating
7. Explain with sketches birefringent strip coating method to determine specimen
stresses.
8. Describe birefringence coating stresses.
9. Explain reinforcing effects of birefringent coating.
10. What is the necessity of the refrigeration technique?
11. Explain the effects of coating thickness using birefringent strip coating method.
12. Explain the phenomenon of Stress separation techniques using Oblique incidence.

5. Experimental Stress Analysis
Module – V
Part-A Brittle coating
1. What is brittle coating? Explain how it is useful in stress analysis.
2. Explain with neat sketches, Brittle coating crack patterns produced by different states
of stress.
Or
Explain the following (1) Brittle coatings stresses, (2) Brittle coating Crack patterns
3. Explain calibration of Brittle coatings.
4. Explain with neat sketch refrigeration techniques used to analysis coating stress.
5. Explain with neat sketch load relaxation techniques used to analysis coating stress.
6. What are brittle coating and explain the types of brittle coatings,
7. Describe advantages and applications of brittle coating.
Part-B Moire technique
8. Explain with sketches the geometrical approach to moire fringe analysis.
9. List the applications and advantages of moire technique.
10. Explain the method of out of plane displacement measurement using moire.
11. Explain moire fringes produced by mechanical interference.
12. Explain with sketches the displacement field approach to moire fringe analysis.
13. Explain the method of out of plane slope measurements.