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Engineering Materials

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

More than
None of these
Less than
Equal to

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Engineering Materials
Which of the following constituents of steels is softest and least strong?

Ferrite
Austenite
Pearlite
Cementite

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Engineering Materials
Which of the following property is desirable in parts subjected to shock and impact loads?

Toughness
Brittleness
Stiffness
Strength

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Engineering Materials
Nodular iron has

Low melting point
All of these
High tensile strength
High machinability

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Engineering Materials
Closed packed hexagonal space lattice is found in

Zinc, magnesium, cobalt, cadmium, antimony and bismuth
Gamma-iron, aluminium, copper, lead, silver and nickel
Alpha-iron, tungsten, chromium and molybdenum
None of these

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Engineering Materials
In malleable iron, carbon is present in the form of

Flakes
Cementite
Free carbon
Nodular aggregates of graphite

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