Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
71 Cards in this Set
- Front
- Back
|
Which penetrant property affects the speed of penetration? |
Viscosity |
|
|
Why must penetrants have solvent ability? |
To dissolve and hold dyes in solution? |
|
|
What does built in emulsifier in water washable penetrant aid in? |
Removability |
|
|
Whats the term for strong attraction of materials molecules to each other? |
Cohesion |
|
|
Term for the strong attraction of one materials molecules to another material? |
Adhesion |
|
|
How is liquids ability to wet a surface measured? |
By the angle between the liquid and the surface at the point of contact as the liquid advances along the surface |
|
|
What Force explains how penetrants can enter a crack? |
Capillary action |
|
|
How should you treat materials such as rubber and plastic before inspecting them? |
You should pretest the items to ensure the penetrant is compatible with them. |
|
|
What is the flash point of most commonly used penetrants |
Above 200 F |
|
|
What is type 3 penetrant? |
It utilizes both visible and florescent dyes |
|
|
What is method D penetrant process? |
Post emulsifiable hydrophilic penetrant |
|
|
What term used to identify family groups of materials from the same manufacture |
The system concept |
|
|
Type of penetrant not usually used? |
Type 3 processes |
|
|
What is the least sensitive of the florescent inspection methods |
Method A water washable |
|
|
What is the classification of sensitivity level-4 penetrant |
Ultra high sensitivity |
|
|
How can the size and shape of a part affect your selection of a penetrant |
It has a bearing penetrant removal considerations |
|
|
What is minimum penetrant dwell time when inspecting parts for service induced defects |
At least 30 minutes |
|
|
What is good rule of thumb for developer dwell time |
Half penetrant dwell time |
|
|
What is the maximum dwell time for a developer |
2 hours |
|
|
How did lipohillic emulsifier act to remove pentrant |
It diffuses with the surface penetrant beginning at the outermost layer and slowly extends toward the part surface |
|
|
How are hydrophilic removers received |
As conceptual liquids |
|
|
What does the mechanical action of the prerinse water spray accomplish |
Removes over 80 percent of the surface penetrant |
|
|
Two methods of hydrophilically removing penetrant following the prerinse |
Immersion or spray application |
|
|
Normal time range for immersion of a part in hydrophilic remover |
30 secs to 2 minutes |
|
|
Maximum concentration of a hydrophilic remover bath |
35 percent |
|
|
When is there a distinct change in a removers performance? |
The penetrant tolerance point |
|
|
What is the usual concentration range of sprayed hydrophilic remover |
.1to.5 percent remover to water by volume |
|
|
What affect does higher water pressure have on hydrophilic spray removal |
Increases both mechanical and chemical actions |
|
|
How is method C penetrant removed from a part |
Solvent |
|
|
What solvents can be used to remove penetrants but can't be used as a precleaner |
Slow drying solvent removers |
|
|
What should never be done to a cloth used to remove method c penetrant before inspection |
Immerse the cloth in solvent or saturate it with spray solvent |
|
|
What type of developer is normally supplied in an aerosol container |
Non aqueous wet |
|
|
How much may the perception it's of a fluorescent indication be affected by developer. |
As much as 600 times |
|
|
What can cause high concentrations of airborne penetrant material |
Repeated spraying of penetrant materials in a tightly enrolled area |
|
|
How can you reduced the concentration of spray penetrant in enclosed areas |
Spray the penetrant on a swab or acid brush outside the area |
|
|
What precaution can you take with method c materials when working in sunlit hot conditions |
Place materials off to the side in a shaded area |
|
|
What are the maintenance requirements for portable penetrant kits |
Keep the kit clean and stocked with serviceable materials |
|
|
How long does it take penetrant oven to each operating temperature |
20 to 30 minutes |
|
|
Optimum wavelength of black light used for penetrant inspections |
365 nanmeters |
|
|
What is the purpose of a black light filter |
Remove undesirable wavelengths of light |
|
|
Highest temperature a black light can reach |
750F |
|
|
How often should dryer and inspection booth fan motors be lubricated |
Every 3 months |
|
|
What determines the length of time a part spends at the penetrant application station? |
The recommended dwell time |
|
|
How long is a hydrophilic prerinse |
30 to 120 seconds |
|
|
What are hydrophilic agents, which displace pentrant called |
Surfactants |
|
|
Optimum angle for spraying a part during pentrant removal |
45° |
|
|
Three materials, not including water, makeup water soluble developer |
Developer particles ,wetting agents and corrosion inhibitor |
|
|
What must be done to water suspended developers to maintain an even concentration |
Frequent stirring |
|
|
What must be done to non aqueous developer before application |
Vigorous shake of can to mix developer |
|
|
At what temperature do you operate pen line oven |
140°f |
|
|
How long do you wait for your eyes to adjust to the darkened booth before inspecting parts |
5 minutes |
|
|
Minimum and maximum temperature for penetrants inspections |
Min 40°f Max 125°f |
|
|
What Developer conditions on the part should be avoided |
Avoid thick spots or a heavy developer application |
|
|
What two considerations should not affect your decision to call a part defective |
If both system performance test and the test report are satisfactory |
|
|
What should you do if you discover accumulation of dried penetrant during a part inspection |
Completely preclean and reprocess it |
|
|
What causes relevant penetrant indications on a part |
Actual discontinuities in the part |
|
|
What type of indication does cracks , cold shuts, and laps normally produce |
Continuous lines |
|
|
What type of indication could be caused by excessively course grain structure |
Small dots |
|
|
When can you accept new penetrant material for use when it was not centrally procured |
If both the system performance test and the test report are satisfactory |
|
|
What is the maximum penetrant process control interval based on volume of use |
Monthly |
|
|
What process control reference standard is manufactured specifically to test penetrant material |
Cracked chrome panels |
|
|
How can you avoid cross contamination of panels when performing process control tests |
Use separate brushes or swabs to apply the in use and reference materials |
|
|
What is the preferred method of testing newly mixed hydrophilic remover |
Refractometer test |
|
|
Why should you not use glass or metal rods when performing initial concentration checks on hydrophilic remover |
It may scratch the refractometer prism face |
|
|
How do you test in use hydrophilic remover |
Performance test |
|
|
What type of panel is used for in use for in use emulsifier testing |
Oxide blasted annealed type 301 or 302 stainless steel panels |
|
|
At what angle are panels placed during pentrant dwell when testing hydrophilic removers |
60°angle |
|
|
When do you test spray hydrophilic remover concentration levels |
Whenever water pressure or the aspirator is adjusted and at the same interval as your system performance test |
|
|
How are develop bath concentrations tested |
By specific gravity hydrometer testing |
|
|
What panel is used to test developer bath wetting ability |
Cracked chrome test panels |
|
|
When checking the inspection booth during hydrophilic penetrant processing what should the darkness level be |
2 lumens per square foot or less |
