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Engineering Materials

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

RC 65
RC 48
RC 57
RC 80

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

2.5277777777778
2.1180555555556
40 : 60
0.88888888888889

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Engineering Materials
Delta iron occurs at temperature of

Between 910°C and 1400°C
Room temperature
Between 1400°C and 1539°C
Above melting point

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Engineering Materials
The percentage of carbon in low carbon steel is

0.5%
0.15%
0.3%
0.05%

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Engineering Materials
Beryllium bronze contains

80% copper and 20% beryllium
99% copper and 1% beryllium
60% copper and 40% beryllium
97.75% copper and 2.25% beryllium

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Engineering Materials
When steel containing less than 0.8% carbon is cooled slowly from temperatures above or within the critical range, it consists of

Mainly ferrite
Ferrite and pearlite
Mainly pearlite
Pearlite and cementite

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