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Engineering Materials

Engineering Materials
Which of the following constituents of steels is softest and least strong?

Austenite
Pearlite
Cementite
Ferrite

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Engineering Materials
When low carbon steel is heated up to upper critical temperature

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

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Engineering Materials
Muntz metal contains copper and zinc in the ratio of

0.88888888888889
2.1180555555556
40 : 60
2.5277777777778

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Engineering Materials
Gun metal contains

90% copper and 10% tin
70 - 78% copper and rest tin
70% copper and 30% zinc
85 - 92% copper and rest tin with little lead and nickel

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

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

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Engineering Materials
The hardness is the property of a material due to which it

Breaks with little permanent distortion
Can be rolled or hammered into thin sheets
Can cut another metal
Can be drawn into wires

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