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Materials and Construction

Materials and Construction
Which of the following is the most suitable material of construction for evaporator & its tubes for concentrating NaOH solution to 70%?

Nickel
Karbate
Steel
Cast iron

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Materials and Construction
Softening of hardned steel is done by its

Tempering
Annealing
Carburising
Normalising

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Materials and Construction
Nitriding of steel is done (in electric furnace) at __________ °C.

2210
510
910
1720

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Materials and Construction
Graphite is corroded by

Sulphuric acid (10%)
Sea water
None of these
Hydrochloric acid

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

Twinning
Strain ageing
Screw dislocation
Solid solution hardening

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Materials and Construction
Nickel and copper are the basic constituents of

Monel metal
Inconel
German silver
Hastelloy

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