Materials and Construction - Chemical Engineering Questions and Answers

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Lead is

not resistant to corrosion.

used as a cathodic material.

not used as pigment (in its compound forms) for paints.

used as a shock absorber (in mattress form) between the foundation and steel framework of skyscrapper buildings.

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

510

1720

2210

910

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Addition of 2% nickel in steel makes it suitable for making

electronic valves

boiler plates, rivets etc.

turbine blades

connecting rod

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The softest material just next to talc in the Mhos scale is

quartz

gypsum

feldspar

fluorite

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Fatigue strength of a material increases by

having notches in the specimen

rise in temperature

under stressing the specimen

having scratches on the surface

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Specify the material of construction suitable for handling concentrated HNO₃ at 100°C.

High silicon iron, Kel-F and teflon

Tin and wood

Silicone rubber

Stainless steel

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Aluminium storage vessel can be used to store

aqua regia

ferrous sulphate

hydrochloric acid (10%)

none of these

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Silicone rubber is not resistant to the corrosive action of

sulphuric acid (10%)

sulphuric acid (95%)

ether

both (b) and (c)

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Which metal is protected by the layer of its own oxide ?

Iron

Silver

Calcium

Aluminium