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Engineering Materials

Engineering Materials
The machinability of steel is improved by adding

Chromium
Nickel and chromium
Sulphur, lead and phosphorus
Nickel

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Engineering Materials
The crystal structure of brass is

F.C.C.
Orthorhombic crystalline structure
H.C.P.
C.C.

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Engineering Materials
The purpose of heat treatment is to

Modify the structure of the material
Change grain size
Any one of these
Relieve the stresses set up in the material after hot or cold working

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Engineering Materials
Balls for ball bearings are made of

Stainless steel
Cast iron
Carbon-chrome steel
Mild steel

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Engineering Materials
Iron-carbon alloys containing carbon ________ 4.3% are known as hyper-eutectic cast irons.

Equal to
Less than
More than
None of these

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Engineering Materials
Which of the following represents the allotropic forms of iron?

Alpha iron, gamma from and delta iron
Alpha iron and beta iron
Body centered cubic iron and face centered cubic iron
Alpha iron, beta iron and gamma iron

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