German silver contains

Which of the following is added in low carbon steels to prevent them from becoming porous?

The austenite is a solid solution of carbon or iron carbide in gamma-iron.

A steel with 0.carbon is known as

For the pipe fitting like elbow, tee, union etc., which of the following is preferred?

Blast furnace is used to produce

The process which improves the machinability of steels, but lowers the hardness and tensile strength, is

In the austempering process of heat treatment, austenite changes into

The machine tool guide ways are usually hardened by

A steel with carbon __________ is known as hypo-eutectoid steel.

Cast iron is a ductile material.

When a steel containing more than 0.carbon is cooled slowly below the lower critical point, it consists of

Chilled cast iron is produced

The alloying element which reduces the formation of iron sulphide in steel is

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

In the lower part of the blast furnace (zone of fusion), the temperature is

Macro-structure of a material is, generally, examined by

There are fourteen atoms in a unit cell of

Free cutting steels

Manganese is added in low carbon steel to

For a steel containing 0.carbon

According to Indian standard specifications, a plain carbon steel designated byC8 means that the carbon content is

Which of the following impurity in cast iron promotes graphite nodule formation and increases the fluidity of the molten metal?

Aluminium has low density and addition of silicon improves its fluidity and therefore, its castability.

The maximum internal diameter of a blast furnace is about

The compressive strength of cast iron is __________ that of its tensile strength.

When a low carbon steel is heated upto lower critical temperature,

The ratio of the volume occupied by the atoms to the total volume of the unit cell is called

The presence of hydrogen in steel causes

Beryllium bronze contains

In high speed steels, manganese is used to tougher the metal and to increase its

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

Wrought iron

In iron, the presence of carbon in free form is called graphite.

The high speed steel has __________ percentage of tungsten.

The malleability is the property of a material due to which it can be rolled or hammered into thin sheets.

Iron-carbon alloys containing 4.carbon are known as hypo-eutectic cast irons.

Which of the following statement is wrong?

Which of the following iron exists atC?

Which of the following property is desirable for materials used in tools and machines?

In spheroidising process, the steel is

When a steel containing less than 0.carbon is cooled slowly from temperatures above or within the critical range, it consists of

Grey cast iron is __________ than white cast iron.

Which of the following statement is incorrect about duralumin?

The property of a material which enables it to retain the deformation permanently, is called

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

The machinability of aluminium increases when __________ is added to aluminium.

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

In a body centred cubic space lattice, there are nine atoms out of which eight atoms are located at the corners of the cube and one atom at its centre.

The essential constituent of a hardened steel is