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Engineering Materials

Engineering Materials
The addition of which of the following improves machining of copper?

Vanadium
Sulphur
Tin
Zinc

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Engineering Materials
In low carbon steels, ________ raises the yield point and improves the resistance to atmospheric corrosion.

Sulphur
Manganese
Phosphorus
Silicon

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Engineering Materials
A material is known as allotropic or polymorphic if it

Exists in several crystal forms at different temperatures
Responds to heat treatment
Has its atoms distributed in a random pattern
Has a fixed structure under all conditions

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Engineering Materials
Which of the following material has maximum ductility?

Mild steel
Copper
Aluminium
Nickel

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Engineering Materials
Chromium when added to steel _________ the tensile strength.

Increases
Decreases
Does not effect
None of these

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Engineering Materials
The usual composition of a soldering alloy is

Tin, lead and small percentage of antimony
Tin and lead
Tin, lead and silver
Tin and copper

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