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1) An engineer’s hammer is made of___________________? a. cast iron b. forged steel c. mild steel d. high carbon steel e. H.S.S
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2) Surveying tapes are made of a material having low coefficient of expansion and enough strength. The alloy used is__________________? a. silver metal b. duralumin c. Hastelloy d. monel metal e. invar
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3) Basic constituents of Monel metal are _________________? a. nickel, copper b. nickel, molybdenum c. zinc, tin, lead d. nickel, lead and tin e. none of the above
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4) Eutectoid steel contains following percentage of carbon_______________? a. 0.02% b. 0.3% c. 0.63% d. 0.8% e. 1.2%.
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5) Pick up the wrong statement Nickel and chromium in steel help in _________________? a. providing corrosion resistance b. improving machining properties c. providing high strength at elevated temperatures d. raising the elastic limit e. improving the resilience and ductility
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6) Railway rails are normally made of_______________? a. mild steel b. alloy steel c. high carbon d. tungsten steel e. cast iron steel
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7) Corrosion resistance of steel is increased by addition of________________? a. chromium and nickel b. sulphur, phosphorus, lead c. vanadium, aluminium d. tungsten, molybdenum, vanadium, chromium e. zinc
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8) Maximum percentage of carbon in ferrite is___________________? a. 0.025% b. 0.06% c. 0.1% d. 0.25% e. 0.8%.
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9) The most effective inhibitor of grain growth, when added in small quantities is__________________? a. carbon b. vanadium c. manganese d. cobalt e. copper
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10) ‘Killed steels’ are those steels__________________? a. which are destroyed by burning b. which after their destruction are recycled to produce fresh steel c. which are deoxidised in the ladle with silicon and aluminium d. in which carbon is completely burnt e. which have poor properties due to improper manufacturing
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11) Carbon steel is_______________? a. made by adding carbon in steel b. refined from cast iron c. an alloy of iron and carbon with varying quantities of phosphorus and sulphur d. extensively used for making cutting tools e. extremely brittle
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12) An important property of malleable cast iron in comparison to grey cast iron is the high___________________? a. compressive strength b. ductility c. carbon content d. hardness e. surface finish
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13) In mottled cast iron, carbon is available in__________________? a. free form b. combined form c. nodular form d. flat form e. partly in free and partly in combined state
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14) Cast iron has_________________? a. high tensile strength b. its elastic limit close to the ultimate breaking strength c. high ductility d. all of the above e. none of the above
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15) A reversible change in the atomic structure of the steel with a corresponding change in the properties is known as_________________? a. allotropic change b. recrystallisation c. heat treatment d. precipitation e. austempering
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16) Pick up wrong statement about wrought iron ? a. It contains carbon of the order of 0 to 0.25% b. It melts at 1535°C c. It is very soft and ductile d. It can be easily forge welded e. It is made by adding suitable percent¬age of carbon to molten iron and subjecting the product to repeated hammering and rolling
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17) Wrought iron is________________? a. hard b. high in strength c. highly resistant to corrosion d. heat treated to change its properties e. least resistant to corrosion
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18) In nodular iron, graphite is in the form of_____________________? a. cementite b. free carbon c. flakes d. spheroids e. nodular aggregates of graphite
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19) Pig iron is the name given to________________? a. raw material for blast furnace b. product of blast furnace made by reduction of iron ore c. iron containing huge quantities of carbon d. iron in molten form in the ladles e. iron scrap
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20) The percentage of carbon in pig iron varies from___________________? a. 0.1 to 1.2% b. 1.5 to 2.5% c. 2.5 to 4% d. 4 to 4.5% e. 4.5 to 6.3%.
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