Engine 2014: General Subjects

1. A A discontinuity in the form of a crack would appear as a thin light line against the dark background of the film.
2. B Porosity, a discontinuity caused by entrapped gas, would occur as various sized round dark spots.
3. C As long as the plane of a crack is not in direct alignment  with the direction of radiation, detection is certain.
4. D All of the above.

Tip: press A-D to answer