1. Electrons in an atom can exist?
Top of Form
Only in exact energy levels
Only in exact energy shells
At random throughout the atom
In Exact energy levels and in exact energy shells
All the above
Bottom of Form
2. A material that has high hardness and good electrical and thermal connectivity is known as?
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A plastic material
A ceramic material
A metallic material
A liquid material
Bottom of Form 3. What term is used to define the change of state directly from solid to gas?
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Crystalisation
Vaporisation
Sublimation
None of the above
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4. Which of the following is a crystal lattice that has nine atoms, eight at each corner and one centrally between them?
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Hexagonal close packing
Body centred cubic
Face centred cubic
Body centred tetragonal
Bottom of Form 5. Which of the following materials is Body centred cubic at room temperature?
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Copper
Gold
Iron
Nickel
Bottom of Form 6. A property of a fine grain material is that it will?
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Machine more easily than corse grain
Case harden more easily than coarse grain
Have higher strength than coarse grain
All the above
Bottom of Form 7. Permanent deformation can occur in which of the following ways?
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Static deformation
Twinning deformation
Elastic deformation
All of the above
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8. Work done to produce plastic deformation below a materials re-crystallisation temperature is known as?
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Recovery work
Cold work
Twinning
Plasticity work
Bottom of Form 9. Solution heat treatment requires which of the following?
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To dissolve maximum amount of equilibrium preciptant in the solid solution
Very high temperatures
Diffusion times in excess of 24 hours
All of the above
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10. Preciptation hardening is most commonly carried out on which of the following materials?
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Carbon steel
Lead
Copper
Alluminium
Bottom of Form 11. Altropic changes occur in the?
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Liquid state
Solid state
Gaseous state
Liquid or solid state
Bottom of Form 12. Which of the following is an allotropic material?
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Iron
Copper
Lead
Aluminium
Bottom of Form
13. A heat treatment process that requires a material to be heated above its critical temperature for some period of time for carbon to unite in solid solution with iron in the gamma or F.C.C. lattice is known as?
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Spherodizing
Annealing
Austentitization
Normalising
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14. A process used to decrease hardness, increase ductility and occasionally improve machinability of high carbon steels is called?
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Annealing
Austenitization
Spheroidizing
Stress relieving
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15. A treatment that is used to give minimum hardness and maximum ductility of steel is?
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Annealing
Austenitization
Spheroidizing
Normalising
Bottom of Form 16. Localised corrosion causing deep extend holes is known as?
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Fisives
Pitting
Worm holes
None of the above
Bottom of Form 17. Which of the following is classed as permanent deformation?
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Twinning
Rotational deformation
Slip
Twinning and Slip
All of the above
Bottom of Form 18. Annealing will achieve which of the following properties?
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Increase ductility and decrease hardness
Increase ductility and increase hardness
Decrease ductility and increase hardness
Decrease ductility and decrease hardness
Bottom of Form 19. Of the following metals which is most suceptible to corrosion by sea water?
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Gold
Copper
Zinc
Lead
Bottom of Form
20. During the hardening of steel which of the following quenching media will produce the severest quench?
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Water
Brine
Oil
Air
Bottom of Form 21. Which is the most common metallic element found on earth?
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Iron
Titanium
Aluminium
Magnesium
Bottom of Form 22. The product of a blast furnace is known as?
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Iron
Steel
Pig iron
A pig
Bottom of Form 23. What is the approproximate carbon content of Pig iron?
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1-2%
2-3%
3-4%
4-5%
Bottom of Form 24. When the carbon content of iron is reduced below 2% it is called?
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Steel
Gray iron
White iron
Ductile iron
Bottom of Form 25. A Bessemer converter is?
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A method of producing cast iron
A method of producing pig iron
A method of producing wrought iron
A method of producing steel
Bottom of Form 26. Practically all steel is made with the use of?
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Hydrogen
Oxygen
Nitrogen
Helium
Bottom of Form 27. The carbon content of low carbon steel is?
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6-25 points of carbon
25-50 points of carbon
0.06%-0.25% of carbon
6-25 points and 0.06%-0.25% of carbon
None of the above
Bottom of Form 28. The carbon content of high carbon steel is?
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6-25 points of carbon
25-50 points of carbon
50-160 points of carbon
Over 160 points of carbon
Bottom of Form 29. An alloy steel is a steel containing one or more?
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Elements
Atoms
Mixtures
Components
Bottom of Form 30. What do the letters AISI?
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American Institute of Steel Industries
American Iron and Steel Industries
American Industries of Steel Institutes
American Iron and Steel Institute
Bottom of Form 31. Which of teh following is a classification of Stainless Steel?
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Ferritic
Martensitic
Austenitic
Ferritic and Austenitic
All of the above
Bottom of Form 32. Austenitic stainless steel most typically contain?
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18% Chromium 8% Nickel
15% Chromium 10% Nickel
10% Chromium 15% Nickel
8% Chromium 18% Nickel
Bottom of Form 33. Which of the following metals can be magentised?
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Martensitic stainless
Ferritic stainless
Austenitic stainless
Martensitic stainless and Ferritic stainless
None of the above
Bottom of Form 34. Which of the following may be used as an alloying element of steel?
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Copper
Nickel
Aluminium
None of the above
All the above
Bottom of Form 35. Steel has a carbon content of less than?
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4%
3%
2%
1%
Bottom of Form 36. Which is the main alloying element of austenitic stainless steels?
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Nickel
Manganese
Molybdenum
Chromium
Bottom of Form 37. Which of the following furnaces is NOT used to produce steel?
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Blast furnace
Bessemer converter
Basic oxygen furnace
Open hearth furnace
Bottom of Form 38. Tool and die steels are classed as?
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Low carbon steels
Medium carbon steels
High carbon steels
Alloy steels
Bottom of Form 39. Which of the following alloying additions are used to produce tool and die steels?
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Nickel
Chromium
Manganese
All of the above
Both Chromium and Manganese
Bottom of Form