MATERIALS AND CONSTRUCTION QUIZ

Softening of hardned steel is done by its

Carburising

Tempering

Annealing

Normalising

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Rubber lined vessels are corroded by the action of

All of these

Aqua regia

Chloroform

Sulphuric acid (95%)

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Hammers and railway rails are normally made of

Mild steel

Medium carbon steel

High carbon steel

Dead mild steel

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Tempering of steel is done to make it

Soft

Rollable

Hard

Brittle

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Hardened steel is softened by

Tempering

Annealing

Normalising

Carburising

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A hardened steel essentially contains

Martensite

Sorbite

None of these

Troostite

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__________ of a material results, when its strength is increased & ductility is decreased by heating at a relatively lower temperature after cold working.

Solid solution hardening

Strain ageing

Screw dislocation

Twinning

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Stainless steel is not corroded by

Saturated brine

Sulphuric acid (10%)

Hydrochloric acid (10%)

Nitric acid (10%)

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Zinc is not used

For producing zinc base die casting alloys

As an alloying element in various bronzes

As anode for corrosion prevention in boiler

In its oxide form as pigments

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Addition of nickel to copper improves its

Strength

Ductility

Machinability

Hardness

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