Choose the right variant.
1. An important feature of hot working is that it a) eliminates porosity, directionality, and segregation. b) provides better ductility and toughness. c) provides the improvement of mechanical properties of metals. d) all of the mentioned above. 2. During the forging of a bar a) the grains of the metal become greatly elongated in the direction of flow. b) the toughness of the metal is greatly improved in direction of flow. c) the toughness of the metal is weakened in directions transverse to the flow. d) all of the mentioned above. 3. Fracture of the workpiece during forming can result from a) strain. b) inner flaws. c) stress. d) all of the mentioned above. 4. All materials respond to external forces such as a) compression, tension, fatigue and creep. b) tension, creep, torsion and shear. c) compression, shear, bending and tension. d) tension, compression, torsion, bending and shear. 5. In mechanical working processes the metal is shaped a) by heat and pressure. b) by heat only. c) by pressure. 6. The initial materials for the mechanical working of metals are a) ingots and billets of certain cross sections and weights. b) ingots and billets of different cross sections and weights. c) ingots and billets of various cross sections and weights.
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