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MCQs 1: An engineer’s hammer is made of___________________?

cast iron forged steel mild steel high carbon steel H.S.S
Answer Explanation

MCQs 2: Surveying tapes are made of a material having low coefficient of expansion and enough strength. The alloy used is__________________?

silver metal duralumin Hastelloy monel metal invar
Answer Explanation

MCQs 3: Basic constituents of Monel metal are _________________?

nickel, copper nickel, molybdenum zinc, tin, lead nickel, lead and tin none of the above
Answer Explanation

MCQs 4: Eutectoid steel contains following percentage of carbon_______________?

0.02% 0.3% 0.63% 0.8% 1.2%.
Answer Explanation

MCQs 5: Pick up the wrong statement Nickel and chromium in steel help in _________________?

providing corrosion resistance improving machining properties providing high strength at elevated temperatures raising the elastic limit improving the resilience and ductility
Answer Explanation

MCQs 6: Railway rails are normally made of_______________?

mild steel alloy steel high carbon tungsten steel cast iron steel
Answer Explanation

MCQs 7: Corrosion resistance of steel is increased by addition of________________?

chromium and nickel sulphur, phosphorus, lead vanadium, aluminium tungsten, molybdenum, vanadium, chromium zinc
Answer Explanation

MCQs 8: Maximum percentage of carbon in ferrite is___________________?

0.025% 0.06% 0.1% 0.25% 0.8%.
Answer Explanation

MCQs 9: The most effective inhibitor of grain growth, when added in small quantities is__________________?

carbon vanadium manganese cobalt copper
Answer Explanation

MCQs 10: ‘Killed steels’ are those steels__________________?

which are destroyed by burning which after their destruction are recycled to produce fresh steel which are deoxidised in the ladle with silicon and aluminium in which carbon is completely burnt which have poor properties due to improper manufacturing
Answer Explanation

MCQs 11: Carbon steel is_______________?

made by adding carbon in steel refined from cast iron an alloy of iron and carbon with varying quantities of phosphorus and sulphur extensively used for making cutting tools extremely brittle
Answer Explanation

MCQs 12: An important property of malleable cast iron in comparison to grey cast iron is the high___________________?

compressive strength ductility carbon content hardness surface finish
Answer Explanation

MCQs 13: In mottled cast iron, carbon is available in__________________?

free form combined form nodular form flat form partly in free and partly in combined state
Answer Explanation

MCQs 14: Cast iron has_________________?

high tensile strength its elastic limit close to the ultimate breaking strength high ductility all of the above none of the above
Answer Explanation

MCQs 15: A reversible change in the atomic structure of the steel with a corresponding change in the properties is known as_________________?

allotropic change recrystallisation heat treatment precipitation austempering
Answer Explanation

MCQs 16: Pick up wrong statement about wrought iron ?

It contains carbon of the order of 0 to 0.25% It melts at 1535°C It is very soft and ductile It can be easily forge welded It is made by adding suitable percent¬age of carbon to molten iron and subjecting the product to repeated hammering and rolling
Answer Explanation

MCQs 17: Wrought iron is________________?

hard high in strength highly resistant to corrosion heat treated to change its properties least resistant to corrosion
Answer Explanation

MCQs 18: In nodular iron, graphite is in the form of_____________________?

cementite free carbon flakes spheroids nodular aggregates of graphite
Answer Explanation

MCQs 19: Pig iron is the name given to________________?

raw material for blast furnace product of blast furnace made by reduction of iron ore iron containing huge quantities of carbon iron in molten form in the ladles iron scrap
Answer Explanation

MCQs 20: The percentage of carbon in pig iron varies from___________________?

0.1 to 1.2% 1.5 to 2.5% 2.5 to 4% 4 to 4.5% 4.5 to 6.3%.
Answer Explanation

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