NDT Interview Study Guide & Non-Destructive Testing Technical Questions Revision Notes
How often should NTD equipment be calibrated? - ANS ✔✔Reveals knowledge of testing
equipment and specifications.
What information should be included in a test report? - ANS ✔✔Tests the candidate's
knowledge of reporting procedures.
How do you ensure the tests you conduct are accurate and thorough? - ANS ✔✔Highlights the
candidate's methods and procedures.
What information is required when designing a new material test? - ANS ✔✔Demonstrates
knowledge of testing procedures.
In your experience, what should less experienced NDT technicians look out for? - ANS
✔✔Highlights the candidate's work experience and expertise in the field.
WHY IS ACOUSTIC IMPEDANCE RELEVANT? - ANS ✔✔Sample answer: Acoustic impedance helps
us assess the absorption of sound in a material and determine the acoustic transmission and
reflection where two dissimilar materials meet. This is important if we want to understand why
certain things are happening as we perform an ultrasonic inspection. Acoustic impedance is also
an important principle in transducer application and design.
HOW DO YOU DETERMINE ACCEPTANCE OR REJECTION? - ANS ✔✔Sample answer: To
determine acceptance or rejection, I look to the standards outlined by groups like the American
Society for Testing and Materials (ASTM International), American Society of Mechanical
Engineers (ASME) and Aerospace Industries Association (AIA).
For example, if conducting an ultrasonic examination of a concrete structure, I would rely on
ASTM E3100-17, the Standard Guide for Acoustic Emission Examination of Concrete Structures.
, WHY IS PROPER SURFACE CLEANING IMPORTANT? - ANS ✔✔Sample answer: Proper cleaning is
required to remove any surface residue or contaminants, which can interfere with test results
and hide discontinuities. This has a larger implication than just the part being inspected; if the
testing results are compromised, it could put the entire structure or piece of machinery the part
will be used in danger of failure.
WHY IS CALIBRATION IMPORTANT? - ANS ✔✔Sample answer: Calibration is essential to
maintain traceability and test accuracy in the field. This includes equipment, tools, gauges, and
all components used in testing. I ensure our equipment meets the standards for manufacturer
calibration, which ensures the equipment is functioning as designed, and user calibration, which
validates that the correct level of precision and accuracy are achieved.
What specific NDT skills and qualifications can you bring to this position? - ANS ✔✔....
What is the different between Defects or discontinuities? - ANS ✔✔Discontinuities: Any
imperfection or interruption in the normal physical structure or configuration of a product
(cracks, laps, inclusion, etc). Discontinuity may or may not affect the usefulness of the product
Defect: A discontinuity whose size, shape, orientation, location or properties makes it
detrimental to the useful service of the product in which it occurs or exceeds the accept/reject
criteria for the given design. Defect is a type of discontinuity.
For detection of surfaceweld defects or discontinuities what are the NDT methods commonly
used? - ANS ✔✔The NDT methods are commonly used to detect the defect/discontinuities on
surface weld:
-Visual Testing (VT)
-Penetrant Testing (PT)
-Magnetic Particle Testing (MT)
-Eddy Current Testing (ET)
For detection of internal weld defects or discontinuities, material what are the NDT methods
commonly used? - ANS ✔✔The NDT methods to detect internal weld defect/discontinuities:
How often should NTD equipment be calibrated? - ANS ✔✔Reveals knowledge of testing
equipment and specifications.
What information should be included in a test report? - ANS ✔✔Tests the candidate's
knowledge of reporting procedures.
How do you ensure the tests you conduct are accurate and thorough? - ANS ✔✔Highlights the
candidate's methods and procedures.
What information is required when designing a new material test? - ANS ✔✔Demonstrates
knowledge of testing procedures.
In your experience, what should less experienced NDT technicians look out for? - ANS
✔✔Highlights the candidate's work experience and expertise in the field.
WHY IS ACOUSTIC IMPEDANCE RELEVANT? - ANS ✔✔Sample answer: Acoustic impedance helps
us assess the absorption of sound in a material and determine the acoustic transmission and
reflection where two dissimilar materials meet. This is important if we want to understand why
certain things are happening as we perform an ultrasonic inspection. Acoustic impedance is also
an important principle in transducer application and design.
HOW DO YOU DETERMINE ACCEPTANCE OR REJECTION? - ANS ✔✔Sample answer: To
determine acceptance or rejection, I look to the standards outlined by groups like the American
Society for Testing and Materials (ASTM International), American Society of Mechanical
Engineers (ASME) and Aerospace Industries Association (AIA).
For example, if conducting an ultrasonic examination of a concrete structure, I would rely on
ASTM E3100-17, the Standard Guide for Acoustic Emission Examination of Concrete Structures.
, WHY IS PROPER SURFACE CLEANING IMPORTANT? - ANS ✔✔Sample answer: Proper cleaning is
required to remove any surface residue or contaminants, which can interfere with test results
and hide discontinuities. This has a larger implication than just the part being inspected; if the
testing results are compromised, it could put the entire structure or piece of machinery the part
will be used in danger of failure.
WHY IS CALIBRATION IMPORTANT? - ANS ✔✔Sample answer: Calibration is essential to
maintain traceability and test accuracy in the field. This includes equipment, tools, gauges, and
all components used in testing. I ensure our equipment meets the standards for manufacturer
calibration, which ensures the equipment is functioning as designed, and user calibration, which
validates that the correct level of precision and accuracy are achieved.
What specific NDT skills and qualifications can you bring to this position? - ANS ✔✔....
What is the different between Defects or discontinuities? - ANS ✔✔Discontinuities: Any
imperfection or interruption in the normal physical structure or configuration of a product
(cracks, laps, inclusion, etc). Discontinuity may or may not affect the usefulness of the product
Defect: A discontinuity whose size, shape, orientation, location or properties makes it
detrimental to the useful service of the product in which it occurs or exceeds the accept/reject
criteria for the given design. Defect is a type of discontinuity.
For detection of surfaceweld defects or discontinuities what are the NDT methods commonly
used? - ANS ✔✔The NDT methods are commonly used to detect the defect/discontinuities on
surface weld:
-Visual Testing (VT)
-Penetrant Testing (PT)
-Magnetic Particle Testing (MT)
-Eddy Current Testing (ET)
For detection of internal weld defects or discontinuities, material what are the NDT methods
commonly used? - ANS ✔✔The NDT methods to detect internal weld defect/discontinuities:
