Mechanical Engineering :: Engineering Materials
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Duralumin contains
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The addition of which of the following improves machining of copper?
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When a medium carbon steel is heated to coarsening temperature,
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In process annealing, the hypo-eutectoid steel is
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Delta-iron occurs between the temperature range of
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According to Indian standard specifications, SG 400/15 means
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White cast iron has
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Iron-carbon alloys containing carbon __________ 4.3% are known as hyper-eutectic cast irons.
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A.
3.5 to 4.5% copper, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese and rest aluminium
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B.
3.5 to 4.5% copper, 1.2 to 1.7% managanese, 1.8 to 2.3% nickel, 0.6% each of silicon, magnesium and iron, and rest aluminium
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C.
4 to 4.5% magnesium, 3 to 4% copper and rest aluminium
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D.
5 to 6% tin, 2 to 3% copper and rest aluminium
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A.
heated from 30° C to 50° C above the upper critical temperature and then cooled in still air
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B.
heated from 30° C to 50° C above the upper critical temperature and then cooled suddenly in a suitable cooling medium
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C.
heated from 30° C to 50° C above the upper critical temperature and then cooled slowly in the furnace
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D.
heated below or close to the lower critical temperature and then cooled slowly
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A.
spheroidal graphite cast iron with B.H.N. 400 and minimum tensile strength 15 MPa
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B.
spheroidal graphite cast iron with minimum tensile strength 400 MPa and 15 percent elongation
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C.
spheroidal graphite cast iron with minimum compressive strength 400 MPa and 15 percent reduction in area
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D.
none of the above
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