Chapter Two Review

CHAPTER TWO
REVIEW
TRUE 1. Wire brushing Is a common and acceptable method of surface

cleaning a test part that is to be penetrant inspected.
FALSE 2. A good exhaust system is recommended when working with

cleaning solvents.
TRUE 3. Vapor degreasing is often used to remove oxidation, rust, and

scale before a part is penetrant inspected.
TRUE 4. Parts that have been painted usually cannot be inspected with
penetrants because suitable paint removing techniques have not
been developed.
TRUE 5. Detergent cleaning is acceptable for post cleaning but should

never be used for precleaning because it may affect the emulsifier
during the penetrant test.
TRUE 6. Etching is often effective in precleaning a part that has been

machined to a specific tolerance by surface grinding.
FALSE 7. Only visible dye penetrants are available in portable kits

because fluorescent dyes will not function in pressurized spray
cans.
FALSE 8. Dry developers are usually only used with visible dye
penetrants.
TRUE 9. Emulsifiers and solvents are both commonly used in penetrant

testing as post cleaners.
TRUE 10. Wet developers should never be used when they will come
into contact with gaseous or liquid oxygen because of the results
caused by oxygen and water mixing.
TRUE 11. Emulsifiers must have high penetrating characteristics to

emulsify penetrants that lie in fillets and corners.
TRUE 12. The black light used in fluorescent penetrant inspection is not
hazardous to the human eyes if the correct filter is in place and not
broken or cracked.
TRUE 13. Penetrant materials are often placed in groupings that will
assure a valid test with materials that are compatible with each
other.
FALSE 14. Nonaqueous developer refers to a powder that is applied dry.
TRUE 15. Post-emulsifiable penetrants are usually soluble in water after

the application of an emulsifier.
TRUE 16. Water-washable penetrants are cornmonly used with either a

visible or fluorescent dye.
FALSE 17. Flashpoint refers to the lowest temperature at which vapors

will ignite when exposed to flame.
CHAPTER THREE
REVIEW
FALSE 1. A dual sensitivity penetrant contains a special dye that is visible

in white light and will fluoresce without the use of a black light.
TRUE 2. A part being penetrant inspected must stay immersed in the

penetrant tank for the entire specified dwell time.
TRUE 3. The liquid penetrant leak-through test refers to the ability of a

penetrant to spread through the dry developer evenly.
FALSE 4. Visible dye penetrants are usually considered to be less

sensitive than fluorescent penetrants.
FALSE 5. Water-washable penetrants have a built-in emulsifier that

permits good results in penetrant removal from parts suspected of
having wide or shallow discontinjuities.
TRUE 6. Solvent-removable penetrants are available in both visible and

fluorescent dye.
TRUE 7. Excess post-emulsifiable penetrant is commonly removed by

spraying the surface of the part with cleaner (solvent) and then
wiping with a lint-free towel.
TRUE 8. Water washable penetrant systems are usually very portable

because the materials are commonly used in pressurized spray
cans.
FALSE 9. Warming the specimen to temperatures up to about 20o C tends

to accelerate penetration and shortens dwell time.
TRUE 10.For the dwell time to be accurate, the surface of the specimen
must stay wet with penetrant for the entire time specified.
TRUE 11.The typipal dwell time for most penetrant Inspections is about
20-30 minutes.
VISIBLE FLUORESCENT 12. List two (2) of the commonly used

methods of applying penetrants to a
specimen that is to be inspected.
1. DETERGENT CLEANING 13. List four (4) of the commonly used

methods of precleaning the specimen before
penetrant inspection
2. VAPOR DEGREASING
3. STEAM CLEANING
4. SOLVENT CLEANING
B 14. If you were asked to examine 200 steel bolts, each 3/8 x 3
inches with
rolled threads, which penetrant method would you choose?
(a) Post-emulsification (b) Water-washable
FILTERED PARTICLE TECHNIQUE 15. The filtered particle method

of penetrant inspection used extra
fine fluorescent particles that will
not pass through a #120 sieve.

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CHAPTER TWO

TRUE 1. Wire brushing Is a common and acceptable method of surface

FALSE 2. A good exhaust system is recommended when working with

TRUE 3. Vapor degreasing is often used to remove oxidation, rust, and

TRUE 5. Detergent cleaning is acceptable for post cleaning but should

TRUE 6. Etching is often effective in precleaning a part that has been

FALSE 7. Only visible dye penetrants are available in portable kits

TRUE 9. Emulsifiers and solvents are both commonly used in penetrant

TRUE 11. Emulsifiers must have high penetrating characteristics to

FALSE 14. Nonaqueous developer refers to a powder that is applied dry.

TRUE 15. Post-emulsifiable penetrants are usually soluble in water after

TRUE 16. Water-washable penetrants are cornmonly used with either a

FALSE 17. Flashpoint refers to the lowest temperature at which vapors

FALSE 1. A dual sensitivity penetrant contains a special dye that is visible

TRUE 2. A part being penetrant inspected must stay immersed in the

TRUE 3. The liquid penetrant leak-through test refers to the ability of a

FALSE 4. Visible dye penetrants are usually considered to be less

FALSE 5. Water-washable penetrants have a built-in emulsifier that

TRUE 6. Solvent-removable penetrants are available in both visible and

TRUE 7. Excess post-emulsifiable penetrant is commonly removed by

TRUE 8. Water washable penetrant systems are usually very portable

FALSE 9. Warming the specimen to temperatures up to about 20o C tends

VISIBLE FLUORESCENT 12. List two (2) of the commonly used

1. DETERGENT CLEANING 13. List four (4) of the commonly used

rolled threads, which penetrant method would you choose?

(a) Post-emulsification (b) Water-washable

FILTERED PARTICLE TECHNIQUE 15. The filtered particle method

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