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Engineering Materials

Engineering Materials
The machinability of aluminium increases when _________ is added to aluminium.

Magnesium
Copper
Lead and bismuth
Silicon

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Engineering Materials
Blast furnace produces following by reduction of iron ore

Pig iron
Cast iron
Wrought iron
Malleable iron

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Engineering Materials
According to Indian standard specifications, plain carbon steel designated by 40 C8 means that the carbon content is

0.0004
0.4 to 0.6%
0.6 to 0.8%
0.35 to 0.45%

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Engineering Materials
Which of the following statements are true for annealing of steels?

Cooling is done slowly and steadily
Internal stresses are relieved
All of these
Steels are heated to 500 to 700°C

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Engineering Materials
In compression, a prism of brittle material will break

By crushing into thousands of pieces
By forming a bulge
By shearing along oblique plane
In direction perpendicular to application of load

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Engineering Materials
If a refractory contains high content of silicon, it means refractory is

Neutral
Acidic
Basic
Brittle

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