Engineering Materials - Mechanical Engineering Questions and Answers

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

Strength

Stiffness

Brittleness

Toughness

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German silver contains

1% silver

2% silver

5% silver

no silver

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Connecting rod is, usually, made from

low carbon steel

high carbon steel

medium carbon steel

high speed steel

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Which of the following inpurity in cast iron makes it hard and brittle?

Silicon

Sulphur

Manganese

Phosphorus

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There are fourteen atoms in a unit cell of

body centred cubic space lattice

face centred cubic space lattice

close packed hexagonal space lattice

none of these

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The maximum internal diameter of a blast furnace is about

3 m

6 m

9 m

12 m

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In spheroidising process, the steel is

heated below the lower critical temperature and then cooled slowly

heated upto the lower critical temperature and then cooled in still air

heated slightly above the lower critical temperature and then cooled slowly to a temperature of 600°C

none of the above

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Pearlite is a combination of 87% ferrite and 13% cementite.

Yes

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The percentage carbon content in wrought iron is about

0.02

0.1

0.4