Carbon steel is

• Made by adding carbon in steel

• Refined from cast iron

• an alloy of iron and carbon with varying quantities of phosphorus and sulphur

• extremely brittle.

Which of the following is also known as mild steel?

• Low carbon steel

• Medium carbon steel

• High carbon steel

• Plain carbon steel

Which of the following attributes explain why pure metals are not frequently used in engineering applications?

• Hardness

• Brittleness

• Softness

• Luster

What are the advantages of plain carbon steels over alloy steels?

• Inexpensive but hard to handle

• Inexpensive and easy to handle

• Expensive but easy to handle

• There are no advantages of plain carbon steels

Which steels are generally used for making connecting rods and gear shafts?

• Low carbon steels

• Medium carbon steels

• High carbon steels

• Stainless steels

Which of these are applications of high-carbon steel?

• Gears, valves

• Steel wires, sheets, screws

• Clutch discs, valve springs

• Machine tools, leaf and coil springs

What is the composition of carbon in medium carbon steels?

• 0.05%

• 0.1% – 0.3%

• 0.25% – 0.6%

• More than 0.6%

In low carbon steels, presence of small quantities of sulphur improves

• Weldability

• Formability

• Machinability

• Hardenability

Which of the following constituents of steels is softest and least strong

• Austenite

• Pearlite

• Ferrite

• Cementite

• Bainite

Wrought iron is

• Hard

• High in strength

• Highly resistant to corrosion

• Heat treated to change its properties

• Least resistant to corrosion.