Relation Of NDT To Manufacturing

Question 1

1. Fracture is a type of material failure.  Of the following, which is another type of material failure?
A. Fracture mechanics
B. Low-frequency dynamic loading
C. Permanent deformation 
D. Elongation within the elastic range

Answer 1

C. Permanent deformation

Question 2

2. Which of the following statements best differentiates between a defect and a discontinuity?
   A. Discontinuities can propagate and become defects
   B. All discontinuities are defects
   C. All defects will lead to failure if undetected, discontinuities can be harmless
   D. Discontinuities are external natural boundaries only, defects are internal flaws originating from errors in processing

Answer 2

A. Discontinuities can propagate and become defects

Question 3

3. Nondestructive testing (NDT) is often differentiated from other measurements or inspection techniques in that:
   A. NDT involves indirect tests related to some other quality or characteristic of the material
   B. NDT is a measurement of dimensions, geometry and appearance
   C. NDT uses electronic instruments to identify, evaluate and locate discontinuities
   D. NDT is an inspection tool used to confirm the findings of the many other quality assurance techniques

Answer 3

A. NDT involves indirect tests related to some other quality or characteristic of the material

Question 4

4. Which of the following is not a function of NDT?
   A. Identification and sorting of material
   B. Identification of material properties
   C. Ensuring absence of faults or defects that could cause a part to fail
   D. Determine the remaining life of a structure

Answer 4

D. Determine the remaining life of a structure

Question 5

5. An important basis for the success of fracture control design procedures is:
   A. That all flaws are detected by NDT or proof testing before the component enters service
   B. In the use of large factors of safety
   C. In the use of a value of strength that the material used in the design is presumed to possess
   D. The need to ensure that unexpected flaws of some critical size are not present when the component enters service

Answer 5

D. The need to ensure that unexpected flaws of some critical size are not present when the component enters service

Question 6

6. If properly used, NDT can assist in fracture control by:
   A. Accurately measuring the tensile strength of design materials
   B. Providing an accurate evaluation of the number and type of discontinuities that exist in a material
   C. Predicting the time it will take a given size discontinuity to grow to a critical size
   D. Determining the corrosion rate

Answer 6

B. Providing an accurate evaluation of the number and type of discontinuities that exist in a material

Question 7

7. A statement that particular experiment produced a 0.9 probability of detection with a 95% confidence levels means what?
   A. There is a 95% probability that the probability of detection is overstated
   B. There is a 5% probability that the probability of the detection is overstated
   C. On average, 90% of all flaws will be detected
   D. On average, 95 out of 100 flaws will be detected 90% of the time

Answer 7

B. There is a 5% probability that the probability of the detection is overstated