Day 40-Oct 30-worksheet-PWD-Ferrous,non ferrous& properties

Which steel manufacturing process completely removes sulphur and is particularly suited for Indian pig iron?

• Bessemer process

• LD process

• Cementation process

• Crucible process

In wrought iron manufacturing, the stage where slag is removed from puddle balls by forging is:

• Refining

• Puddling

• Shingling

• Rolling

The richest iron ore with the highest Fe content is:

• Hematite

• Magnetite

• Pyrite

• Siderite

Naval brass is produced by adding 1% tin to which base brass?

• Cartridge brass

• Muntz metal

• Delta metal

• Low brass

The non-ferrous alloy used as a substitute for brass due to higher corrosion resistance is:

• Monel metal

• Aluminium bronze

• Nickel silver

• Y-alloy

Which heat treatment relieves internal stresses produced during hardening?

• Hardening

• Tempering

• Normalizing

• Cyaniding

Wrought iron cannot be permanently magnetised because of its fibrous structure.

• True

• False

Assertion (A): wrought iron is tougher and more elastic than mild steel. Reason (R): wrought iron contains higher carbon than mold steel, improving toughness and shock resistance.

• Both A and R are true and R is the correct explanation of A

• Both A and R are true but R is not the correct explanation of A

• A is true but R is false

• A is false , R is false

The process of converting pig iron into wrought iron by stirring in a molten state is called:

(a)  

The specific gravity of mild steel is approximately:

• 7.3

• 7.8

• 8.9

• 6.5