Engineering Materials Practice Set-2

21. White cast iron

Is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable

Is produced by annealing process. It is soft, tough and easily machined metal

Contains 1.7 to 3.5% carbon in Free State and is obtained by the slow cooling of molten cast iron

Is produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material

22. Addition of manganese to aluminium results in

One of the best known age and precipitation hardening systems

Improvement of casting characteristics

Improving machinability

Improvement of corrosion resistance

23. Pearlite consists of

6.67% carbon and 93.33% iron

13% cementite and 87% ferrite

13% ferrite and 87% cementite

13% carbon and 87% ferrite

24. When medium carbon steel is heated to coarsening temperature

There is no change in grain size

The average grain size is a minimum

The grain size increases very rapidly

The grain size first increases and then decreases very rapidly

25. A reversible change in the atomic structure of steel with corresponding change in the properties is known as

Molecular change

Solidus change

Physical change

Allotropic change

26. Ductile cast iron

Is produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material

Is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable

Is produced by annealing process. It is soft, tough and easily machined metal

Contains 1.7 to 3.5% carbon in Free State and is obtained by the slow cooling of molten cast iron

27. Which of the following alloys does not contain tin?

Solder admiralty

Fusible metal

White metal

Phosphor bronze

28. Malleable cast iron

Is produced by annealing process. It is soft, tough, and easily machined metal

Is produced by small additions of magnesium (or cerium) in the ladle. Graphite is in the nodular or spheroidal form and is well dispersed throughout the material

Contains 1.7 to 3.5% carbon in Free State and is obtained by the slow cooling of molten cast iron

Is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable

29. An eutectoid steel consists of

Pearlite and cementite

Wholly austenite

Pearlite and ferrite

Wholly pearlite

30. The material in which the atoms are arranged chaotically, is called

Crystalline material

Amorphous material

Mesomorphous material

None of these

Engineering Materials Practice Set-2

Related

Leave a ReplyCancel reply

Secured Payments

Protection

Engineering Materials Practice Set-2

Share this Now with Friends:

Related

Leave a ReplyCancel reply

Secured Payments

Protection