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Engineering Materials

Engineering Materials
Maximum percentage of carbon in austenite is

0.008
0.0026
0.00025
0.017

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Engineering Materials
The portion of the blast furnace below its widest cross-section is called

Bosh
Throat
Stack
Hearth

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Engineering Materials
The bond formed by transferring electrons from one atom to another is called

None of these
Covalent bond
Ionic bond
Metallic bond

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Engineering Materials
For the allotropic forms of iron, the points of arrest are

The points where there is no further flow of metal
The points of discontinuity
Constant for all metals
The points where no further change occurs

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Engineering Materials
Sulphur in steel

Lowers the toughness and transverse ductility
Reduces the grain size
Decreases tensile strength and hardness
Acts as deoxidiser

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Engineering Materials
When filing or machining cast iron makes our hands black, then it shows that ________ is present in cast iron.

None of these
Free graphite
Both A and B
Cementite

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