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Engineering Materials QUESTIONS AND ANSWERS

Mechanical Engineering : Engineering Materials QUESTIONS AND ANSWERS :: part6 : 21 to 25

Following Mechanical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2024 and IES 2024 examinations :

21.The hardness of steel primarily depends on

%age of carbon

%age of alloying elements

heat treatment employed

method of manufacture

shape of carbides and their distribu-tion in iron.

22.The crystal structure of brass is

F.C.C.

B.C.C.

H.C.P.

Orthorhombic crystalline structure

none of the above.

23.Malleable cast iron

contains lv7 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

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

none of the above.

24.Which is the false statement about wrought iron. It has

high resistance to rusting and cor�rosion

high ductility

ability of hold protective coating

easily weldable characteristics

uniform strength in all directions.

More Engineering Materials QUESTIONS AND ANSWERS available in next pages