Question bank

1. ME8097 NON DESTRUCTIVE TESTING AND EVALUATION
Question Bank
Prepared By Dr.N E Godwin Pithalis
Question Bank:
UNIT-1:
PART-A:
1. What do you mean by non-destructive testing?
2. What are the objectives of non-destructive testing?
3. What are the defects that can be identified by NDT techniques?
4. What are the advantages of Non-Destructive Testing over Destructive
Testing?
5. What are the factors to be considered for the choice of specific NDT
methods?
6. What is Visual Inspection?
7. What is the basic principle of Visual Inspection?
8. What is the use of optical aid instruments in visual inspection?
9. What is optical microscope?
10. What are the different ways of achieving the optical connections in
Boroscopes?
PART-B & C:
1. Explain in detail the optical aides used in visual inspection
2. Briefly explain the different types of boroscopes used in visual inspection
3. Compare and contrast the Destructive testing methods with that of Non-
Destructive testing methods with examples
4. With the help of a neat diagram, explain computer enhanced visual inspection
system.
5. Describe the testing methods in detail for material characterization
6. Explain the various optical aids in visual inspection
7. What are discontinuities? Explain various types of discontinuities with
examples.

2. ME8097 NON DESTRUCTIVE TESTING AND EVALUATION
Question Bank
Prepared By Dr.N E Godwin Pithalis
UNIT-2:
PART-A:
1. What is meant by ‘dwell and development time’ with respect to liquid
penetrant testing?
2. What type of defects can be detected in a liquid penetrant test?
3. State the desirable characteristics of a good developer
4. Give the merits and demerits of dry developers
5. List the steps involved in magnetic particle testing
6. Mention any two materials that can be used as developers in LPT
7. Magnetic particle inspection cannot be used to detect internal defects. Why?
8. Why should the material be demagnetized after it is subjected to MPT?
9. What is residual magnetism in magnetic particle testing?
10. What is the effect of the size of the magnetic particles on the test
performance in MPT?
11. What are prods in magnetic particle testing?
PART-B & C:
1. Describe the purposes, types, characteristics and properties of penetrants used
in liquid penetrant testing
2. Explain how the liquid penetrant test be used to detect surface discontinuities?
Explain the various stages of liquid penetrant testing procedure
3. Explain with diagrams the functioning of Lipophilic and Hydrophilic
Emulsifiers in liquid penetrant inspection process
4. Explain the post-emulsifiable lipophilic and solvent removable methods in
Liquid penetrant testing using process flow diagram
5. Discuss about longitudinal magnetization and circumferential magnetization
in magnetic particle testing with neat sketch
6. Discuss about the various ways of magnetizing the component for MPT

3. ME8097 NON DESTRUCTIVE TESTING AND EVALUATION
Question Bank
Prepared By Dr.N E Godwin Pithalis
7. Explain the working of wet horizontal type magnetization equipment used in
magnetic particle testing.
8. Briefly write about different type of magnetic particles used in magnetic
particle testing?
UNIT-III
PART-A
1. What is the basic principle of thermography?
2. What is emissivity in thermography testing?
3. Enumerate the instruments used for infrared detection
4. List the advantage of thermography
5. List any four characteristics of infrared?
6. State the principle of eddy current test?
7. State the properties of eddy current?
8. List the types of probes used in eddy current inspection
9. What are Hall-effect sensors?
10. What are SQUID devices in eddy current testing?
PART-B& C:
1. Explain the principle of thermography by active approach and mention few
applications of it.
2. Explain the instrumentation and various methods of thermography inspection
3. Explain the principle of thermography testing by passive approach and its
application.
4. List and explain in detail about the laws of thermal imaging in Thermography
test.
5. Illustrate about Contact and Non-Contact inspection methods in
Thermography with neat sketch.

4. ME8097 NON DESTRUCTIVE TESTING AND EVALUATION
Question Bank
Prepared By Dr.N E Godwin Pithalis
6. Describe the principle of lock-in thermography with simple line diagram.
Also state its advantages and limitations
7. Explain different types of eddy current probes on the basis of mode of
operation
8. What is array probe in eddy current testing? Explain the principle of eddy
current array (ECA) technology
9. How fatigue crack is detected using eddy current inspection? Explain the
procedure involved
10. Enumerate the various probes used in eddy current testing with detailed
sketch.
UNIT-IV
PART-A
1. What are the different factors influencing ultrasonic testing?
2. List the various factors influencing the selection of ultrasonic transducers
3. What is non-contact type ultrasonic testing?
4. What is the significance of couplant in ultrasonic testing?
5. List the different modes of ultrasonic waves
6. Define transducer
7. Name the types of ultrasonic transducer
8. What is the major difference between straight beam and angle beam
transducers?
9. What are the sources of acoustic emission?
10. What are the requisite characteristics of an Acoustic emission sensor?
11. Name the standard calibration blocks used for UT
12. Give the properties of Acoustic waves
13. What is Kaiser effect in acoustic waves?

5. ME8097 NON DESTRUCTIVE TESTING AND EVALUATION
Question Bank
Prepared By Dr.N E Godwin Pithalis
PART-B& C:
1. Explain various components involved in ultrasonic testing equipment with
block diagram
2. How pulse echo method of ultrasonic inspection is carried out and also state
the advantages and disadvantages of pulse-echo method?
3. Explain about the typical designs of test blocks that are used as reference
standards for straight beam inspection and angle beam inspection in UT
4. Discuss about the time of flight diffraction and phased array techniques of
ultrasonic testing with neat figures?
5. Explain the different scan modes of ultrasonic testing. Discuss the use of UT
to inspect porosity/cavity in materials.
6. Briefly explain the wave propagation of ultrasonic testing
7. Explain the different types and significance of sensors and preamplifiers in
Acoustic Emission technique?
8. Explain the principle of acoustic emission testing with neat diagram
9. Describe the experimental setup of Acoustic Emission testing
10. Demonstrate the principle of four channel data acquisition in Acoustic
Emission testing with neat sketch.
UNIT-V
PART-A:
1. What is need for an exposure chart in radiography?
2. What is film contrast in radiography testing?
3. Describe the principles of radiography test
4. Summarize the properties of X-rays
5. Summarize the properties of gamma rays
6. Define inverse square law in radiography
7. Describe computed tomography

6. ME8097 NON DESTRUCTIVE TESTING AND EVALUATION
Question Bank
Prepared By Dr.N E Godwin Pithalis
8. How does the quality of radiographic films be ensured?
9. Differentiate between film and filmless techniques in radiography
10. What is meant by intensifying screens?
11. What is penetrometer?
12. What are the uses of screens?
13. How does computer tomography differ from other imaging techniques?
14. How xero radiography differs from film radiography?
15. What is the need for focusing cup in radiography testing?
PART-B& C:
1. Briefly write about the following phenomena during interaction of X-ray with
matter (i) Photoelectric effect (ii) Compton scattering (iii) Pair production and
(iv)Thomson scattering
2. How computed radiography differs from conventional radiography? Briefly
write about the principle of operation of computed radiography with neat
sketch.
3. Explain the classification of X-ray films used in industrial radiography.
Discuss briefly the construction of X-ray film with simple line diagram
4. What is the basic technique involved in computed tomography?
5. Draw a schematic representation of a computed Tomography process and
explain the method of construction of CT image
6. What are the four possible interactions between a photon (quantum) of
electromagnetic radiation and material? Explain.
7. Discuss about the image conversion media in radiography
8. Describe about Fluoroscopy Testing with neat diagram.
9. Discuss about the safety aspects related to Radiographic testing.
10. Write short notes on the penetrometers and sensitivity in radiography testing
11. Illustrate the components of X-ray generator with suitable sketch