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Engineering Materials

Engineering Materials
The presence of sulphur in pig iron makes

It hard
It brittle
It easily machinable
The casting unsound

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Engineering Materials
Pearlite consists of

13% carbon and 87% ferrite
13% cementite and 87% ferrite
13% ferrite and 87% cementite
6.67% carbon and 93.33% iron

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Engineering Materials
Iron-carbon alloys containing 1.7 to 4.3% carbon are known as

Hypoeutectic cast irons
Hypereutectic cast irons
Eutectic cast irons
None of these

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Engineering Materials
For the allotropic forms of iron, the points of arrest are

The points where no further change occurs
Constant for all metals
The points of discontinuity
The points where there is no further flow of metal

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Engineering Materials
When medium carbon steel is heated to coarsening temperature

The grain size increases very rapidly
The grain size first increases and then decreases very rapidly
There is no change in grain size
The average grain size is a minimum

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Engineering Materials
German silver is an alloy of

Refined silver
Nickel and copper
Nickel, Copper and zinc
Silver and some impurities

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