Mechanical Engineering : Engineering Materials QUESTIONS AND ANSWERS :: part1 : 11 to 15
Following Mechanical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2024 and IES 2024 examinations :
11.Which of the following constituents of steels is softest and least strong |
austenite |
pearlite |
ferrite |
cementlte |
bainite. |
12.Recrystallization temperature is one |
at which crystals first start forming from molten metal when it is cooled |
at which new spherical crystals first begin to form from the old deformed one when a strained metal is heated |
at which change of allotropic form takes place |
at which crystals grow bigger in size |
at which crystals are destroyed on heating. |
13.Gamma iron exits at following temperature |
room temperature |
near melting point |
between 1400�C and 1539�C |
between 910�C and 1400�C |
none of the above. |
14.The following types of materials are usually the most ductile |
face-centred cubic lattice |
body-centred cubic lattice |
hexagonal close-packed lattice |
all of the above |
none of the above. |
15.Delta iron occurs at temperature of |
room temperature |
above melting point |
between 1400�C and 1539�C |
between 910�C and 1400�C |
none of the above. |
More Engineering Materials QUESTIONS AND ANSWERS available in next pages
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