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Surface cracks in aluminium castings and forgings may usually be detected by. submerging the part in a solution of hydrochloric acid and rinsing with clear water. gamma ray inspection. the use of dye penetrants and suitable developers.

Which of these metals is inspected using the magnetic particle inspection method?. Magnesium alloys. Aluminium alloys. Iron alloys.

One way a part may be demagnetized after magnetic particle inspection is by. slowly moving the part out of an AC magnetic field of sufficient strength. slowly moving the part into an AC magnetic field of sufficient strength. subjecting the part to high voltage, low amperage AC.

The testing medium that is generally used in magnetic particle inspection utilises a ferromagnetic material that has. low permeability and high retentivity. high permeability and low retentivity. high permeability and high retentivity.

What non-destructive testing method requires little or no part preparation, is used to detect surface or near-surface defects in most metals, and may also be used to separate metals or alloys and their heat-treat conditions?. Eddy current inspection. Magnetic particle inspection. Ultrasonic inspection.

Gamma Ray Testing of combustion chambers will show up. black on lighter background. grey on white background. light grey on black background.

Which of these non-destructive testing methods is suitable for the inspection of most metals, plastics and ceramics for surface and subsurface defects?. Eddy current inspection. Magnetic particle inspection. Ultrasonic inspection.

Ultrasonic flaw detectors use. high frequency sound waves. a magnetic field. x-rays.

Defects are indicated in the dye penetrant crack detection test by. red lines on a white background. yellowish green marks. green lines and dots.

NDT using colour dye process at temperatures below 15°C will. not be affected by the temperature. retard the penetrant action of the dye and penetration time is extended. mean choosing alternative NDT method.

When using dye penetrant NDT on a tank, the dye penetrant should be applied. on the outside with developer on the outside. on the inside, with developer on the outside. on the inside with the developer on the inside.

In order for dye penetrant inspection to be effective, the material being checked must. be non-magnetic. be magnetic. have surface cracks.

Which of the following metals can be inspected using the magnetic particle inspection method?. Aluminium alloys. Iron alloys. Magnesium alloys.

After completion of electromagnetic crack detection, the test piece must be. allowed to cool to room temperature as slowly as possible. de-magnetised before returning to service. allowed to lose any residual magnetism over as long a period possible.

Which of the following N.D.T. techniques cannot be used on a component manufactured from austenitic stainless steel?. Magnetic - particle. Penetrant dye. Hot oil and chalk.

Fluorescent penetrant processes for the detection of cracks or material defects are used with. a tungsten light source. an infra-red light source. an ultra-violet radiation source.

What is an isotope the power source of?. X-Rays. Ultra Violet Rays. Gamma Rays.

Under magnetic particle inspection, a part will be identified as having a fatigue crack under which condition?. The discontinuity pattern is straight. The discontinuity is found in a highly stressed area of the part. The discontinuity is found in a non-stressed area of the part.

When inspecting a component which is being subjected to the hot fluid chalk process, the examination for defects should be carried out. whilst the item is still quite hot. immediately on removal of the item from the chalk cabinet. when the item is quite cool.

Circular magnetization of a part can be used to detect defects. perpendicular to the concentric circles of magnetisation. parallel to the long axis of the part. perpendicular to the long axis of the part.

An indication of porosity when using a penetrant dye crack detection method is. areas where dye is not showing. an area of scattered dots of dye. closely spaced dots of dye formed in a line.

In a test for adequate demagnetization of a component after a magnetic particle test, the test compass should not deflect. more than 1° when standing due east of the component. more than 1° when standing due south of the component. more than 1° when standing north-east of the component.

If on application of developer it all turns to a pinkish hue, what has happened?. Thin porosity. The hue has pinked. Incorrect cleaning.

If dye penetrant inspection indications are not sharp and clear, the most probable cause is that the part. Is not damaged. was not correctly degaussed before the developer was applied. was not thoroughly cleaned before developer was applied.

The pattern for an inclusion is a magnetic particle build-up forming. a single line. parallel lines. a fern-like pattern.

When carrying out a penetrant dye crack test, before the dye is applied the surface being tested should be. etch primed. thoroughly degreased. painted with developer fluid.

When carrying out a dye penetrant inspection, what time should elapse after applying the developer before inspecting the component?. initial inspection after 30 seconds followed by a 2nd inspection after 10 minutes. After 15 minutes. After 10 minutes.

When should the developer be applied to the component?. After excess penetrant has been removed and the area completely dried. Before applying penetrant. Before the penetrant dries.

To check the structure of a wing. ultrasound NDT is used. High voltage X-rays are used. low voltage X-rays are used.

Which of the following NDT methods requires that the orientation (or direction) of the defect be known before the test can commence?. Ultrasonic and Dye Penetrant. Magnetic Particle and Ultrasonic. X-Ray and Magnetic Particle.

Which of the following defects could not be detected by Eddy Current NDT inspection?. A crack in a glass fibre reinforced plastic cowl. A crack in a magnesium alloy wheel casting. Heat damage of a Haynes Alloy turbine blade.

Which of the following methods could be used to detect the presence of tiny drops of Mercury in a large area of aircraft hull structure after an accident with a mercury thermometer?. X-Ray. Magnetic Particle. Ultrasonic.

Which of the following NDT methods requires that the surface of the test piece is cleaned down to bare metal?. Eddy Current. Magnetic Particle. Dye-penetrant.

When using the colour contrast NDT. the surface paint should be removed. the surface should be lightly scuffed. the surface should be bead blasted.

When using dye penetrant field kit, removal of excess penetrant is done by applying the solvent by. Spraying once direct on the part. Spraying twice direct on the part. using a lint free cloth.

Liquid penetrant tests can be used to detect. internal porosity in castings. corrosion wall thinning in pipes and tubes. fatigue cracks in magnesium alloy parts.

Water-washable liquid penetrants differ from Post-emulsification penetrants in that they. do not need an emulsifier added. need not be removed from surfaces prior to development. can only be used on aluminium alloys.

When using a post-emulsification penetrant, the timing is most critical during. penetrant removal. emulsification. penetration.

A liquid penetrant test cannot. be used on porous materials. Locate sub-surface discontinuities. be used on non-metallic surfaces.

Hot air drying of articles during liquid penetrant testing is carried out at a temperature of. 75°F. 250°F. 130°F.

To check the structure of a wing, which NDT is used?. Radiographic. Dye penetrant. Magnetic Flaw.

Magnetic Flux detection will show defects which are. transverse to the flux direction only. longitudinal to the flux direction only. longitudinal and transverse to the flux direction.

A hairline crack would show up on a dye penetrant inspection as. a continuous line of small dots. a thin broken line or chain. a group of dots spread over a wide area.

When carrying out an ultrasonic inspection, what is the gel used for?. To create a good sonic coupling between the the probe and the test piece. To reduce the friction between the probe and the test piece. To prevent the test piece from becoming scratched by the probe.

Fluorescent dye penetrant is suited for what materials?. Non magnetic non-ferrous materials. Ferrous magnetic materials. Plastics and non magnetic materials.

In film radiography, image quality indicators (IQI) are usually placed. between the intensifying screen and the film. on the film side of the object. on the source side of the test object.

Which type crack will probably cause the most build-up in the magnetic particle indicating medium?. Grinding. Shrink. Fatigue.

When using dye penetrant NDT on a tank, the penetrant should be applied. on the inside, with developer on the inside. on the outside, with developer on the outside. on the inside, with developer on the outside.

To detect a fault with magnetic particle flaw detection, the test requires. two passes in any direction. one pass in any direction. two passes at 90 degrees to each other.

The substance used in ultrasound inspection is. a couplant to allow sound waves to travel. a cleaning agent to keep the components clean. a developer.

Dye penetrant defects are marked using. crayon, unless used in a highly stresses area. pencil. chalk.

Which of the following NDT techniques cannot be used on a component manufactured from austenitic stainless steel?. Penetrant dye. Magnetic particle. Hot oil and chalk.

The dye penetrant field test kit consists of cans of. penetrant, cleaner, developer and a brush. spray penetrant, spray cleaner and spray developer. penetrant, cleaner and developer.

The liquid applied to a component being checked by magnetic particle inspection is for. acting as a transmission medium for the test. to prevent corrosion occurring from contact with the probe. to prevent scratching of the surface by the probe.

Which is the preferred method of test for aluminium alloy alloy?. Electroflux. Magnaflux. Ultrasonic.

A composite flap panel has corrosion. What NDT method will you use to detect?. Low voltage x-ray. Coin tap test. High voltage x-ray.

The eddy current method of flaw detection can detect. sub surface flaws only. surface flaws and those just beneath the surface. surface flaws only.

With dye penetrant how is the developer applied?. Using a tank. As an even layer of chalk applied over the area. At a distance of 10 to 12 inches with several passes.

When using the dye penetrant method crack detection, the indications on a short, deep crack are. single dots. circles. long chain.

A deep internal crack in a structural steel member is detected by. x-ray or ultrasonic process. fluorescent penetrant method. magnetic flaw method.

The ultrasonic method of crack detection can be used on. Surface and subsurface defects on all metals. surface and subsurface defects on ferrous metals only. subsurface defects on all metals.

Porosity in cast materials. Only occurs on the surface. Is only detectable on the surface. is detectable as a surface or sub surface defect.

When using the fluorescent ink flaw detection method, the component should be inspected using an. ultraviolet lamp. Infrared lamp. Ordinary lamp and special glasses.

When using the dye penetrant method of crack detection, it should not normally be used at temperatures. Above 20°C. below 0°C. above 15°C.