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Engineering Materials

Engineering Materials
Hardness of lower bainite (tempered martensite) is about

RC 57
RC 48
RC 80
RC 65

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Engineering Materials
When medium carbon steel is heated to coarsening temperature

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

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

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

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Engineering Materials
Phosphor bronze contains

2.5% phosphorous
0.5% of phosphorous
1% phosphorous
None of these

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Engineering Materials
Admiralty brass used for steam condenser tubes contains copper and zinc in the following ratio

30 : 70
2.1180555555556
2.9375
40 : 60

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Engineering Materials
Bronze contains

90% copper and 10% tin
70 - 75% copper and rest tin
70% copper and 30% zinc
85 - 92% copper and rest tin with little lead and nickel

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