ENGINEERING MATERIALS QUIZ

Duralumin

Brass

Silver

Copper

Is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable

Contains 1.7 to 3.5% carbon in Free State and is obtained by the slow cooling of molten cast iron

Is produced by annealing process. It is soft, tough and easily machined metal

Is produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material

94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe

90% magnesium and 9% aluminium with some copper

92.5% aluminium, 4% copper, 2% nickel, and 1.5% Mg

10% aluminium and 90% copper

Free form

Combined form

Partly in free and partly in combined state

Nodular form

Lead and bismuth

Magnesium

Copper

Silicon

5 to 7%

0.5 to 1%

2.5 to 4.5%

0.012

Percentage of carbon

Shape of carbides and their distribution in iron

Heat treatment employed

Percentage of alloying elements

2.1180555555556

2.5277777777778

0.47916666666667

40 : 60

Reduce machinability

Increase wear resistance

Increase hardenability

Increase endurance strength

Sulphur, phosphorus, lead

Vanadium, aluminium

Chromium and nickel

Tungsten, molybdenum, vanadium, chromium