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4A practice exam › Unit A-6

4A A-6: Elements of Material Science and Welding Technology

26 practice questions in this unit. Each practice set pulls 20 at a time, so you keep seeing new questions as you go.

What this unit covers: Material properties and alloys, welding processes, weld inspection and testing.

Exam theme: Materials, piping and valves. Commonly reported share of the 100-question 4A exam: about 7 questions (unofficial; SOPEEC and ABSA do not publish per-unit counts). See the 4A exam breakdown.

2 free 4A A-6 questions, explained

Original exam-style questions written to the public syllabus, from our free public sample. They are not questions from a real exam.

1. Which mechanical property describes a material's ability to return to its original dimensions once a deforming force is removed?

  • A. Malleability
  • B. Plasticity
  • C. Ductility
  • D. Elasticity
Show the answer and explanation

Answer: D. Elasticity is specifically defined as the ability of a material to return to its original shape after a deforming force is removed. Plasticity is the opposite: plastic materials do not return to their original shape. Ductility refers to permanent deformation under tensile load, and malleability refers to permanent deformation under compressive load.

Why the other options are not the answer

  • A. Malleability is the ability to deform permanently under compression (be hammered or rolled).
  • B. Plasticity is the opposite: a plastic material keeps its new shape after the force is removed.
  • C. Ductility is the ability to deform permanently under tension (be drawn out), not to spring back.

Question ID KE-A06-C01-Q001 · Unit A-6: Elements of Material Science and Welding Technology · Report an error

2. An oscilloscope connected to an ultrasonic transducer displays a reflected sound wave peak while scanning a weld specimen. Which of the following is a valid internal feature that could produce such a reflection?

  • A. Excessive surface convexity on the weld crown
  • B. Slag inclusion trapped within the weld deposit
  • C. A weld bead that is wider than the parent metal thickness
  • D. Undercut at the weld toe that has been ground smooth
Show the answer and explanation

Answer: B. Ultrasonic testing detects internal discontinuities by observing reflections when sound travelling through solid metal reaches a material that conducts sound differently. Internal features that produce reflections include cracks, laminations, inclusions, porosity, and voids. A slag inclusion trapped within the weld deposit is an internal discontinuity that produces such a reflection. Excessive surface convexity and surface undercut (even if ground smooth) are surface conditions, not internal features; weld bead width is a dimensional characteristic that does not cause internal reflections.

Question ID KE-A06-C03-Q006 · Unit A-6: Elements of Material Science and Welding Technology · Report an error

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