Chapter 2

1. Technical materials can be classified into metals and non-metallic materials. Which of these subcategories does not belong to metals?

• Iron

• Light metals

• Plastics

• Steel

2. Dislocations can be divided into…

• Substituted and interstitial

• Coherent and incoherent

• Line and plane

• Screw and edge

The figure shows the scheme of a polycrystalline metal. Which term describes the marked microstructure?

• Interstitial foreign atom

• Incoherent precipitate

• Substituted foreign atom

• Coherent precipitate

4. The test procedures of materials testing can be classified depending on output properties. Which category belongs to the properties: E modulus, tensile strength

• Physical test procedures

• Mechanical and technological test procedures

• Chemical test procedures

• Metallographic test procedures

5. What is the crucial difference between a tensile test and a creep test?

• Specimen geometry

• Testing system

• Loading rate

• Tested material

6. The test procedures can be divided depending on the loading rate. Which loading rate is shown here?

• Continuous – static

• Cyclic – sine

• Continuous – quasi-static

• Cyclic – abrupt

7. Which of these steps is not part of performing a tensile test?

• Identification of the initial gauge length

• Determination of the fracture strain and constriction at break

• Constant load according to DIN / ISO

• Detecting the force extension curve

8. For dynamic strain ageing, the sliding dislocations and the diffusing alloying atoms play a decisive role. How does the diffusion speed relate to the sliding speed of the dislocations?

• Slightly lower

• Nearly the same

• Slightly higher