| 1. | The machinability of steel is improved by adding ? | |
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nickel
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chromium
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nickel and chromium
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sulphur, lead and phosphorus
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Report Question| 2. | The maximum internal diameter of a blast furnace is about ? | |
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3m
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6m
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9m
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12m
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| 3. | Which of the following statement is incorrect about duralumin ? | |
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It is prone to age hardening
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It can be forged
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It has good machining properties
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It is lighter than pure aluminium
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| 4. | The addition of magnesium to cast iron increases its ? | |
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hardness
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ductility and strength in tension
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corrosion resistance
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creep strength
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| 5. | The percentage of carbon in cast iron varies from ? | |
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0.1 to 0.5
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0.5 to 1
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1 to 1.7
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1.7 to 4.5
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| 6. | The portion of the blast furnace above its widest cross-section is called ? | |
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hearth
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stack
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bosh
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throat
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| 7. | The hardness and tensile strength in austenitic stainless steel can be increased by ? | |
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hardening and cold working
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normalising
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martempering
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full annealing
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| 8. | The heat treatment process used for castings is ? | |
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carburising
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normalising
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annealing
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tempering
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| 9. | Which of the following property is desirable in parts subjected to shock and impact loads ? | |
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Strength
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Stiffness
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Brittleness
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Toughness
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| 10. | The coke in the charge of blast furnace ? | |
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controls the grade of pig iron
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acts as an iron-bearing mineral
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supplies heat to reduce ore and melt the iron
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forms a slag by combining with impurities
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