CHEMICAL ENGINEERING BASICS QUIZ

Fatigue resistance of a material is measured by the

Endurance limit

Ultimate tensile strength

Young's modulus

Elastic limit

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Presence of small quantity of sulphur in low carbon steel improves its

Formability

Weldability

Hardenarality

Machinability

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Hydrogen in liquid steels is dissolved

In the molecular form

As tiny gas bubbles

In the atomic form

In the ionic form

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The predominant mode of heat transfer which takes place from boiler furnace to water walls of a boiler is

Both A & B

Convection

Conduction

Radiation

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Alumina, silica, lime and iron oxide are the basic raw material for the manufacture of portland cement. The component of Portland cement which first hardens is

2CaO . SiO₂

5CaO . 3 Al2O₃

3CaO . SiO₂

3CaO . Al2O₃

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The weight of a body at the centre of the earth is

None of these

Infinite

Zero

Same as on the surface of the earth

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Steel produced from phosphatic iron is __________ in nature.

Ductile

Malleable

Brittle

Tough

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__________ is the process used for setting up compressive stresses in the surface of a metal to improve its fatigue strength.

Lancing

Spinning

Shot peening

Slugging

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Maraging steels derive their strength from the following mechanism:

A fine, highly dislocated and strong martensite

Fine dispersions of Fe₃ C nucleated on dislocations in austenite

Fine dispersions of intermetallics of Fe, Ni, Ti etc

Fine dispersions of alloy carbides in a ferrite matrix

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Corrosion rate can not be lowered by reducing the __________ of the corroding medium.

Concentration

Velocity

Temperature

None of these

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