Question # 1

What refers to the application of any process whereby the surface of steel is altered so that it will become hard.

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Caburizing

Case harden zing

Ammealing

Surface hardening

The brown colour of the pulp obtained from chemical pulping is due to the present of

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Chlorine

Residual lignin

Sodium hydochlorite

All above

A steel cannot qualify for stainless prefix until it has at least how many percent of chromium.

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10 %

20 %

5 %

30 %

What is the advantage of quench hardening?

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Imporoved strength

Hardness

Wear characteristics

All of the choice

Which of the following term is not used in pulping.

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Kappa number

Copper number

Bromine Number

Octane Number

The following are primary alloying ingredients of Group H steel except.

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Malybdenum

Cobalt

Chromium

Tungsten

The soap and detergent are source of organic pollutants like.

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Glycerol

Polyphosphates

Sulphonated hydrocarbons

All of these

Which treatment is done with pulp before delivering it to paper making machine.

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Pulp is disperse din water to make slurry

Mechanical refining or heating of the fibers

Addition of chemical additives and recycled fibres from the waste paper plant

All above

Soap is soluble in grease because it

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Is non polar

Has a hydrophobic head

Has a hydrophobic tail

Has an ionic head and a hydrocarbon tail

What is the lowest temperature diffusion hardening process and does not require a quench

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Carburizing

Tempering

Nitriding

Melting

The cooling of molten urea by air in the tower is called.

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Prilling

Evaporation

Condensation

Distillation

Which of the following statement is not true in case of catalytic reforming.

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High temperature results in loss of reformate yield

High naphthenic stock require high space velocity

Presence of water decrease the hydrocracking activity.

None of above

Commercial detergents contain mainly ___________

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RCOON

RONa

RSNa

All above

Bromine number is measure of.

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Paraffins

Unsaturates

Saturates

None of these

Which of the following is the most suitable catalyst for ammonia synthesis.

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Pt

ZnO+ Cr2O3

Fe in fused mixture of Al2O3 + SiO2+ MgO

All of above

What is the equilibrium temperature of transformation of austenite to pearlite

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1000 F

1333 F

166 6 F

1222 F

In the process of preparation of detergents the organic acids produced are neutralized with.

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Sodium hydroxide

Sodium sulphate

Sodium chloride

Potassium hydroxide

What combination of elements has high electrical resistance high corrosion resistance, and high strength at red hear temperatures, making it useful in resistance heating.

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Aluminium bronze

Nichrome

Hastelloy

None of above

What is a process for making glass reinforced shapes that can be general by polling resin impregnated glass stands though a die.

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Continuous pultrusion

Bulk molding

Vacuum bag forming

Computational analysis

Granulated sugar also known as.

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Brown sugar

Refined sugar

White sugar

None of these

Which of the following statements is NOT true .

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About 10% of the earth's crust is iron

Pure iron does not have significant industrial use because it is too weak and soft.

Steel in an alloy of carbon and iron with limits on the amount of carbon

None of above

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