Self Assessment Questions

Question 1

What is the TOTAL wavelength range of an ultraviolet light?

Answer 1

4 nm to 400 nm

Question 2

What is the wavelength range of a black light?

Answer 2

320 nm to 400 nm

Question 3

When using conventional means, what is the most detectable magnetic field?

Answer 3

Longitudinal

Question 4

What would be an advantage of the dry method over the wet method?

Answer 4

It can be easier to use for field inspection with portable equipment

Question 5

If one inch and two inch diameter bars were magnetized by passing the same current through them, describe the magnetic field in relation to each other.

Answer 5

It would be the same for both

Question 6

What is the size of most dry powder magnetic particles used in general flaw detection?

Answer 6

A mixture of sizes and shapes

Question 7

What is a defect caused by thin plates of metal folding on the surface of the forging and not bonding to it?

Answer 7

Forging lap

Question 8

What is a ‘’V’’ shaped internal rupture produced during extrusion when the interior of the metal does not flow as rapidly as the surface?

Answer 8

Cupping

Question 9

What is a forging crack or rupture produced when the metal is worked at improper temperature and/or the reduction of section is too severe?

Answer 9

Burst

Question 10

What is a processing defect caused by large porosity or pipe flattened and spread out during rolling?

Answer 10

Lamination

Question 11

What is a crack that may be found in a forging due to improper trimming of the flash?

Answer 11

Flash line tear

Question 12

What is a processing defect caused by surface cracks that are stretched out and lengthened during the rolling operation of a bar?

Answer 12

Seam

Question 13

What is a processing defect caused by inclusions that have been elongated in the direction of working?

Answer 13

Stringers

Question 14

What is a short, internal fissure caused by stress and decreased solubility of hydrogen during rapid cooling after hot working?

Answer 14

Hydrogen flake

Question 15

Segregation is considered what type of process discontinuity?

Answer 15

Inherent

Question 16

Failure to remove the shrink cavity that forms at the top of an ingot will results in voids called what in the finished product?

Answer 16

Pipe

Question 17

What is a crack like indication formed prior to completion of solidification of the casting because of restricted contraction?

Answer 17

Hot tear

Question 18

What is the phenomenon called that results when one or more alloying elements are not properly diffused?

Answer 18

Segregation

Question 19

What is a discontinuity caused by dissolved gases in the molten metal that become trapped in the solid casting?

Answer 19

Porosity

Question 20

What are particles of foreign material such as sand or slag that are embedded in the cast metal called?

Answer 20

Inclusions