Engineering Materials Online Test – Multiple Choice Questions and Answers 1. Which of the following is a point imperfection? Interstitial imperfection Frenkel imperfection Vacancy all of these 2. The temperature point at which the change starts on heating the steel is called lower critical point upper critical point point of recalescence point of decalescence 3. Which of the following gives the correct order of increasing hot hardness of cutting tool materials? Carbide, Diamond, High speed steel High speed steel, Diamond, Carbide High speed steel, Carbide, Diamond Diamond, Carbide, High speed steel 4. The property of a material necessary for forgings, in stamping images on coins and in ornamental work, is ductility plasticity elasticity malleability 5. The malleability is the property of a material by virtue of which a material retains the deformation produced under load permanently regains its shape and size after the removal of external forces can be drawn into wires with the application of a tensile force can be rolled or hammered into thin sheets 6. Muntz metal (Yellow brass) contains 59% copper, 40% zinc and 1% tin 60% copper and 40% zinc 70% copper and 30% zinc 60.45% copper, 35.2% zinc and 5.35% nickel 7. The process in which carbon and nitrogen both are absorbed by the metal surface to get it hardened is known as cyaniding flame hardening carburising None 8. The portion of the blast furnace above its widest cross-section is called throat stack hearth bosh 9. Silicon bronze contains 60% copper, 35% zinc and 5% manganese 76% copper, 20% silicon and 4% zinc 88% copper, 10% tin and 2% zinc 96% copper, 3% silicon and 1% manganese 10. Which of the following statement is wrong? In spheroidising process, the cementite in the granular form is produced in the structure of steel The annealing process causes complete recrystallisation in steels which have been severely cold worked and a new grain structure is formed The spheroidising process is usually applied to high carbon tool steels which are difficult to machine none of the above Loading … Question 1 of 10
