Engineering Materials
Iron-carbon alloys containing 1.7 to 4.3% carbon are known as

None of these
Eutectic cast irons
Hypoeutectic cast irons
Hypereutectic cast irons

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Engineering Materials
Stress relaxation is the phenomenon

Stress reduces on increasing load
In which deformation tends to loosen the joint and produces a stress reduced
In which stress remains constant on increasing load
In which parts are not loaded

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Engineering Materials
Which of the following statement is true about brittle fracture?

Many metals with hexagonal close packed (H.C.P) crystal structure commonly show brittle fracture
Brittle fracture is always preceded by noise
High temperature and low strain rates favour brittle fracture
Cup and cone formation is characteristic for brittle materials

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Engineering Materials
Aluminium bronze contains

10% aluminium and 90% copper
92.5% aluminium, 4% copper, 2% nickel, and 1.5% Mg
90% magnesium and 9% aluminium with some copper
94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe

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