Top 150+ Solved Liquid Penetrant Testing Level 1 MCQ Questions Answer
Q. The principle on which liquid penetrant testing is based on is:
a. Capillary action of the penetrant
b. Capillary action of cleaner/solvent
c. Capillary action of developer
d. None of the listed is correct
Q. The limitation of a liquid penetrant test is:
a. Only surface breaking discontinuities can be detected if chemically and physically clean and dry
b. Porous materials cannot be tested
c. There is cleaning problem following penetrant inspection in some cases
d. All of the listed limitations are correct
Q. Penetrants may be applied to the surface of part by :
a. Spraying
b. Dipping
c. Pouring
d. All of the above methods are acceptable
Q. Which of the following is a reason to post clean a part after a liquid penetrant test:
a. The part might be further processed
b. If repairs are necessary
c. Developers absorb moisture and may result in part being corroded
d. All of the reasons are correct
Q. Which of the following penetrant has a built-in emulsifier
a. Water washable
b. Solvent removable
c. Post emulsified
d. All of the listed above
Q. Liquid penetrants can be classified into the types of dyes they contain:
a. Visible/colour contrast
b. Fluorescent
c. Dual sensitivity
d. All of the listed is correct
Q. The advantages of using a visible solvent removable penetrant versus a postemulsified fluorescent penetrant is:
a. No UV light is needed
b. The technique is well suitable for site tests or spot checks
c. No water or emulsifiers are needed
d. No extra equipment is needed
Q. The following precautions must be observed when removing the excess surfacepenetrant with a water wash method using a hose pipe:
a. The wash angle should be at 45o
b. A coarse droplet spray
c. Temperature of water 16 to 43oC
d. Pressure as low as possible not to exceed 50 psi
Q. The typical causes for false indications are:
a. Threads, keyways, splines, rough surfaces
b. Sharp corners, pop rivets
c. Insufficient removal of excess surface penetrant, penetrant on operators’ hands, using cloth/paper towels which are not lint free, dirty work surfaces
d. Over washing with high pressure hose pipes
Q. Liquid penetrants can be further categorised by the removal method of excess surfacepenetrant:
a. Water washable
b. Solvent removable
c. Post emulsified
d. All of the above
Q. How will the excess surface penetrant be removed if a post emulsified penetrant wasused:
a. Dip or spray emulsifier onto part
b. Wait correct dwell time
c. Water wash part observing correct recommended rules
d. Dry part and apply developer