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Engineering Materials

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

RC 65
RC 57
RC 48
RC 80

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Engineering Materials
Iron ore is usually found in the form of

Oxides
All of these
Carbonates
Sulphides

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Engineering Materials
The ultimate tensile strength and yield strength of most of the metals, when temperature falls from 0 to 100°C will

Increase
Remain same
First increase and then decrease
Decrease

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Engineering Materials
Cast iron is characterized by minimum of following percentage of carbon

0.013
0.02
0.008
0.002

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Engineering Materials
Recrystallization temperature can be lowered by

Purification of metal
Grain refinement
All of these
Working at lower temperature

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Engineering Materials
The material widely used for making pendulums of clocks is

Heat resisting steel
Nickel steel
Stainless steel
High speed steel

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