Download NDT Midterm Study Guide & Non-Destructive Testing Revision Notes-15.docx and more Exams Advanced Education in PDF only on Docsity!
NDT Midterm Study Guide & Non-Destructive Testing
Revision Notes
Engine rotating parts require what level of penetrant sensitivity: - ANS ✔✔Level 4 When fluorescent penetrant inspection is performed, the penetrant is formulated to glow brightly and give off light at a wavelength that: - ANS ✔✔The eye is most sensitive to under dim lighting conditions while using an ultra violet light source. What does In Accordance With or I.A.W. mean? - ANS ✔✔Both B and C References the manual type your procedure came from, i.e. "NDT manual" References the chapter/section of the procedure you used Fluorescent penetrant application should be monitored to ensure complete coverage of the area of interest using what: - ANS ✔✔Integrity checked black light If the surface of the part has been machined, surface blasted, filed or sanded : - ANS ✔✔The part may also require etching. What are the major requirements needed to become qualified in any NDT method? - ANS ✔✔On the Job Training and Classroom Instruction. Which level of penetrant is the most sensitive? - ANS ✔✔Level 4
The advantage that liquid penetrant testing has over an unaided visual inspection is that: - ANS ✔✔It makes defects easier to see for the inspector Which penetrant classification is further divided into sensitivity levels? - ANS ✔✔Type I What is the most important & basic form of Non-Destructive Inspection/Examination? - ANS ✔✔Visual Inspection Penetrants are designed to: - ANS ✔✔Remain fluid so it can be drawn back to the surface of the part Which of the following identifies the qualification levels of Non Destructive Testing: - ANS ✔✔Level 1 Limited, Level 1, Level 2 & Level 3 The skills and qualifications associated with NDT/NDE are only applicable to the aviation industry. - ANS ✔✔False Which level of qualification requires more hours of classroom instruction and on the job training? - ANS ✔✔Level III When performing liquid penetrant inspection, the part under inspection should be: - ANS ✔✔All of the above. Dry. Clean and smooth to the touch. Free of water, oil, grease and other contaminants.
When performing quality control checks on your black light prior to your FPI inspection, which of the following is correct? - ANS ✔✔Both B & C Perform the black light integrity check before your inspection. Hold the black light 15 inches from the black light sensor when performing the integrity check. Which of the following is a disadvantage of Penetrant Testing? - ANS ✔✔Both A and B. Penetrant testing is temperature sensitive. Only surface defects can be detected Penetrant types can be used on most materials, provided the surface of the part is: - ANS ✔✔Smooth and uniform. Which NDT technique uses a magnetic field to detect defects? - ANS ✔✔Magnetic Particle The most important step in any penetrant type inspection is: - ANS ✔✔Part preparation and cleaning Before you begin a fluorescent penetrant inspection you should: - ANS ✔✔Both A & B Perform the required integrity checks.
Ensure the use of the correct sensitivity level of penetrant. What method of removal is considered solvent removable? - ANS ✔✔Method C Which method of penetrant removal is post emulsified, lipophilic? - ANS ✔✔Method B When performing a surface inspection on a piece of aluminum for possible cracks, what are the possible NDT methods that should be used to confirm your findings? - ANS ✔✔Visual and Penetrant What does Method A refer to? - ANS ✔✔Removal Methods The relevant indications of a post FPI/LPI inspection can appear as what? - ANS ✔✔Round circles, continuous line, and intermittent line A commonly used aid in visual inspection for surface defects in aluminum would most likely be: - ANS ✔✔10X magnifying glass The most commonly used methods of nondestructive testing include: - ANS ✔✔Ultrasound, Magnetic Particle, Eddy Current & Penetrant Generally, there is no harm in using a longer dwell time as long as the penetrant: - ANS ✔✔Remains on the part no longer than is allowed per the procedure in use. Penetrants that are used to detect the smallest defects can create background fluorescence indications on the part being inspected. Which of the following best describes background fluorescence: - ANS ✔✔All of the above
Which of the following is an advantage of Penetrant Testing? - ANS ✔✔Both A and B. Minimal Training is required. It is portable. Which type of penetrant is only a visible dye penetrant? - ANS ✔✔Type II A penetrant must: - ANS ✔✔Spread easily over the surface of the material. Once the surface of the part has been cleaned properly, penetrant can be applied by: - ANS ✔✔All of the above Spraying Brushing Dipping Recall from your lab, when signing for your work, what is not required to be included: - ANS ✔✔Date of calibration for the equipment used When is an unscheduled inspection performed? - ANS ✔✔All of the above After a bird strike After engine FOD ingestion
After a lightning strike What factors can be used to perform/schedule a scheduled inspection? - ANS ✔✔Airframe Cycles, Calendar Time, Flight Hours The total time the penetrant is in contact with the part surface is called: - ANS ✔✔Dwell time The best NDT technique to use to find defects below the surface of a test piece made of aluminum would be what? - ANS ✔✔Ultrasound Why is it important to de-mag a part after the inspection is complete? - ANS ✔✔The residual magnetic field present in the part could interfere with electronic equipment such as compasses and sensitive aircraft wiring. Why is it important to de-mag a part after the inspection is complete? - ANS ✔✔The residual magnetic field present in the part could interfere with electronic equipment such as compasses and sensitive aircraft wiring. Recall from your lab, what should be done first before starting any magnetic particle inspection black light intensity check? - ANS ✔✔Check that the calibration stickers of the light meter and black light sensor have not expired. When a ferromagnetic material is in a demagnetized state the domains are: - ANS ✔✔Randomly organized Scratched, scored and galled areas should be: - ANS ✔✔Stoned and polished with crocus cloth and oil.
When a magnetic object such as a bar magnet is cracked but not broken completely in two, how many poles will exist within that bar magnet? - ANS ✔✔Four Recall from your lab, what is the maximum amount of Gauss that can be present in the test piece after your inspection? - ANS ✔✔+/- 3 Gauss The Continuous Magnetization technique describes the technique where: - ANS ✔✔The magnetizing force is continuously applied and maintained while the magnetic particle bath is applied continuously to the surface of the part. An electromagnetically produced circular magnetic field has magnetic lines of force that run : - ANS ✔✔90 degrees to the long axis of the part. Magnetic particle indications found using the wet continuous method inspection technique are the result of the prepared bath penetrating surface cracks of the test piece. - ANS ✔✔False When all of a material's magnetic domains are aligned, the material is said to be: - ANS ✔✔Magnetically saturated In magnetic particle inspection, the test material must possess what characteristic to be easily magnetized? - ANS ✔✔High permeability Unless otherwise instructed and when considering magnetizing a part for inspection what is the minimal amount of directions the part should be magnetized in? - ANS ✔✔ 2 After a magnetic particle inspection is complete, the part must be demagnetized. Per the LU procedure given, if equipped, what type of current should be used to demagnetize the part? - ANS ✔✔AC
A longitudinal magnetic field has magnetic lines of force that run: - ANS ✔✔Parallel to the long axis of the part. Magnetization of a part using the Indirect Method is accomplished by: - ANS ✔✔A & C The use of current passing though a coil and the part is place longitudinally within the coil. The use of an adjustable horseshoe magnet called a yoke. Materials that have a large, positive susceptibility to an external magnetic field and which can be easily magnetized (such as the trunnion pin tested in your lab) are known as: - ANS ✔✔Ferromagnetic materials. When required, organic finishes (paints, enamels, etc.) shall be removed by: - ANS ✔✔Per LU Process Specification. You are assigned a mag particle inspection on a part that you have done 100 times. You know the procedure forward and backwards. You always pull up the manuals before you conduct any work on your aircraft. But today, the computers are down which prevents you from looking up the manual procedure. You should: - ANS ✔✔Notify your management or lead technician that you cannot proceed until you have access to the manuals. A volume of space where there is a change in the volume of magnetic energy or movement of electrons within that volume is called: - ANS ✔✔A magnetic field
Before performing the Portable Electromagnetic Yoke Procedure, you should perform: - ANS ✔✔All of the above. Black light intensity check. Ambient white light check. Dead weight lift check, Magnetic particle inspection can be done on materials which are made of: - ANS ✔✔Iron, nickel and cobalt In electromagnetism, the measure of the ability of a material to support the formation of a magnetic field within itself is know as: - ANS ✔✔Permeability Statement: Magnetic poles have never been detected in isolation. - ANS ✔✔True Which of the selections below best describes magnetic lines of flux? - ANS ✔✔All of the above Seek the path of least resistance between opposite poles They all have the same strength Their density decreases with increasing distance from the poles "Skin Effect" refers to: - ANS ✔✔AC induced magnetic fields which limit the depth of penetration of the magnetic field in the part being tested due to the
creation of eddy currents associated with AC current flow which oppose the induced magnetic field. Residual Magnetism or Residual Flux is: - ANS ✔✔The magnetic flux density that remains in a test piece when the magnetizing force is returned to zero. When a part under inspection has a crack or a disturbance to the lines of flux, this causes what to be present: - ANS ✔✔Flux leakage field. What is the pie gage used for? - ANS ✔✔Both B & C To ensure that adequate magnetizing force is present in the test piece. To provide an indication of field direction. If you are uncertain about your findings when conducting a mag particle test and you are the only inspector qualified to perform the inspection, you should do what: - ANS ✔✔Demag the part and repeat the procedure. Magnetization of a part using the Direct Method is defined as: - ANS ✔✔Passing electrical current directly through the part. Why is it important to magnetize the part in different directions? - ANS ✔✔The best detection of defects occurs when the magnetic lines of flux are perpendicular to the longest dimensions of the defect. Ferromagnetic materials become magnetized when the magnetic domains within the material are aligned. This can be accomplished by: - ANS ✔✔Both A & B.
