Questions and Answers Section 2

Questions and Answers

Question :

11.Sulphur in cast iron

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increases hardness and brittleness.

Question :

12.Cementite consist of

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6.67% carbon and 93.33% iron.

Note:-

Cementite is an intermetallic compound of iron and carbon, more precisely an intermediate transition metal carbide with the formula Fe₃C. By weight, it is 6.67% carbon and 93.3% iron. It has an orthorhombic crystal structure.

Question :

13.Manganese is added in low carbon steel to

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make the steel ductile and of good bending qualities.

Question :

14.Beryllium bronze contains

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97.75% copper and 2.25% beryllium.

Question :

15.The portion of the blast furnace below its widest cross-section is called

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bosh.

Question :

16.Gamma-iron occurs between the temperature range of

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900°C to 1400°C.

Note:-

Austenite, also known as gamma-phase iron (γ-Fe), is a metallic, non-magnetic allotrope of iron or a solid solution of iron, with an alloying element.

Question :

17.The bond formed by transferring electrons from one atom to another is called

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ionic bond

Note:-

ionic bonding is a type of chemical bond that involves the electrostatic attraction between oppositely charged ions, and is the primary interaction occurring in ionic compounds.

Question :

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

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Toughness.

Question :

19.Connecting rod is, usually, made from

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medium carbon steel.

Note:-

medium carbon steel also known as mild steel, it is a low-cost material that is easy to shape. While not as hard as higher-carbon steels, carburizing can increase its surface hardness. Medium Carbon Steel – Composition of 0.29%-0.54% carbon, with 0.60%-1.65% manganese.

Question :

20.Which of the following inpurity in cast iron makes it hard and brittle?

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Sulphur.