1. How can temper embrittlement occur in alloy steels? a) By quenching the material rapidly b) By exposure to low temperatures c) By isothermal exposure in the range of 400^circ C to 600^circ C d) By applying a tensile load 2. Which test is used to determine temper embrittlement in alloy steels? a) Hardness test b) Notched bar impact test c) Tensile test d) Compression test 3. Does temper embrittlement affect the hardness and tensile properties of the material: a) Yes, it significantly reduces them b) Yes, it increases them c) No, it has no effect on them d) No, but it reduces the elongation 4. What is stress corrosion cracking (SCC)? a) The growth of cracks due to thermal expansion b) The growth of cracks due to tensile stress and a reactive environment c) The weakening of a material due to fatigue loading d) The erosion of material due to high-speed flow of fluids 5. Which factors influence the initiation and propagation of SCC? a) Material hardness and density b) Material type, types of loading, and environment c) Temperature and pressure only d) Surface roughness and coating thickness 6. How does material chemistry and microstructure affect SCC? a) They do not affect SCC b) They affect SCC due to alloy compositions and fabrication processes c) They affect SCC only during high-temperature exposure d) They only affect SCC if the material is not heat-treated 7. How do protective coatings help prevent SCC? a) It exhibits little or no plastic deformation before fracture b) It occurs suddenly without warning c) It shows substantial plastic deformation before fracture d) It occurs at very low stress levels