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Engineering Materials

Engineering Materials
Nickel when added to copper improves

Strength and ductility
Hardness
Machinability
Hardness and strength

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Engineering Materials
1841 high speed steel contains

Vanadium 1%, chromium 4% and tungsten 18%
None of these
Vanadium 18%, chromium 1% and tungsten 4%
Vanadium 4%, chromium 18% and tungsten 1%

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Engineering Materials
Crystal structure of a material is, generally, examined by

Optical microscope
Metallurgical microscope
Naked eye
X-ray techniques

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Engineering Materials
Vanadium in high speed steels

Provides high hot hardness
Promotes decarburisation
Forms very hard carbides and thus increases wear resistance
Promotes retention of austenite

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Engineering Materials
Corrosion resistance of steel is increased by adding

Aluminium and zinc
Nickel and molybdenum
Chromium and nickel
Tungsten and sulphur

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Engineering Materials
Which of the following impurity in cast iron promotes graphite nodule formation and increases the fluidity of the molten metal?

Sulphur
Phosphorus
Manganese
Silicon

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