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Engineering Materials

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

RC 57
RC 80
RC 48
RC 65

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Engineering Materials
Gamma-iron occurs between the temperature ranges of

1400°C to 1530°C
400°C to 600°C
600°C to 900°C
900°C to 1400°C

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Engineering Materials
A material is said to be allotropic, if it has

Atoms distributed in random pattern
Different crystal structures at different temperatures
Any one of the above
Fixed structure at all temperatures

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Engineering Materials
Connecting rod is usually made of

Medium carbon steel
High carbon steel
Aluminium
Low carbon steel

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Engineering Materials
In nodular iron, graphite is in the form of

Free carbon
Spheroids
Cementite
Flakes

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Engineering Materials
Bell metal contains

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

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