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1) Which of the following alloys does not contain tin_________________? a. white metal b. solder admiralty c. fusible metal d. phosphor bronze e. gun metal
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2) Delta metal is an alloy of__________________? a. copper, zinc and iron b. iron, nickel and copper c. iron, lead and tin d. iron, aluminium and magnesium e. copper, zinc and antimony
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3) Phosphor bronze contains____________________? a. 0.5% of phosphorous b. 1% phosphorous c. 2.5% phosphorous d. 5% phosphorous e. none of the above
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4) DuraJomin contains___________________? a. 94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe b. 92.5% aluminium, 40% copper, 2% nickel, and 1.5% Mg c. 10% aluminium and 90% copper d. 90% magnesium and 9% aluminium with some copper e. 94% aluminium and 6% tin
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5) Monel metal contains_________________? a. 63 to 67% nickel and 30% copper b. 88% copper and 10% tin and rest zinc c. alloy of tin, lead and cadmium d. malleable iron and zinc e. none of the above
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6) Perminvar alloy having constant permeability is an alloy of________________? a. nickel, copper and iron b. nickel, copper and zinc c. copper, nickel and antimony d. iron, zinc and bismuth e. antimony, copper and zinc
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7) Muntz metal contains copper and zinc in the ratio of________________? a. 50 : 50 b. 40 : 60 c. 60 : 40 d. 20 : 80 e. 80 : 20
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8) Aluminium bronze contains aluminium and copper in the ratio of___________________? a. 50 : 50 b. 40 : 60 c. 60 : 40 d. 10 : 90 e. 90 : 10
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9) The correct sequence for descending order of machinability is _____________________? a. grey cast iron, low carbon steel, wrought iron b. low carbon steel, grey cast iron, wrought iron c. wrought iron,low carbon steel, grey cast iron d. wrought iron, grey cast iron, low carbon steel e. grey cast iron, wrought iron, low carbon steel
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10) Bell metal contains_____________________? a. 70% copper and 30% zinc b. 90% copper and 10% tin c. 85-92% copper and rest tin with little lead and nickel d. 70-75% copper and rest tin e. 70-75% copper and rest zinc and tin
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11) Pick up the wrong statement? a. aluminium in steel results in excessive grain growth b. manganese in steel induces hardness c. nickel and chromium in steel help in raising the elastic limit and improve the resilience and ductility d. tungsten in steels improves magnetic properties and hardenability e. sulphur, phosphorous and lead im¬prove machining properties of steel
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