Question # 1

What typical penetrator is used in Brinell hardness test

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10 mm ball

1.6 mm diameter ball

20^o needle

None of these

Which of the following cast irons is a high carbon, iron carbon silicon alloy.

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Deorizers

Deoxidizers

Deoxifiers

Deterrent

What element constitutes the major component of most bronzes.

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Tin

Zinc

Carbon

Aluminum

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 %

Each fat or oil in made up of

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A distinctive mixture of several different triglycorides

A distinctive mixture of several aldehydes

Mixture of above both

None of above

The main constituents of ___________ are boron oxide and silica.

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Pyrex glass

Low silica glass

Soda lime glass

Super hard glass

For quality control of Portland cement, the test essentially done is.

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Setting time

Soundness

Tensile strength

All

Which is true for DDT it is.

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Not a pollutant

An antibiotic

A non degradable pollutant

A pesticide

Which type of the coal preferred for metallurgical coal.

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Lignite

Peat

Bituminous coal

None of these

In Pakistan how many units are involved to the production of glass.

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20

25

30

None of these

Naphthalene balls are obtained from

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Carbon

Coke

Coal Tar

All of above

What is a method of casehardening involving diffusion in which the steel to be casehardened is machined, heat treated placed in an air tight box and heated to about 1000 ^oF

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Annealing

Normalizing

Carburizing

Decomposition

What is clinker.

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Roasted calcareous material

Roasted argillaceous material

Roasted calcareous and argillaceous material

Roasted gypsum

The percentage of nitrogen in ammonia is _______________%

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32

82

25

55

What is the approximate chromium range of a ferritic stainless steel.

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12% to 18%

16% to 20%

20% to 24%

12% to 16%

The melting of nearly all glass is done in a continuous tank furnace. which operates steadily over periods of up to.

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a day

a month

a year

None of these

Which of the following give higher fibre strength.

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Eucalyptus

Pine

Bagnasse

Sugar cane

PCRA stand for

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Pollution control research association

Petroleum conversation Research association

Petroleum control research association

All of above

What term is used to denote a family of thermosetting polymers that are reaction products of alcohols and acids.

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Alkaline

Alkydes

Alcocide

Ketones

Which substance is used as filler or additive in paper making.

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Starch

Glucose

Cellulose

Maltose

What group of steels are molybdenum high sped steels.

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Group A

Group D

Group M

Group H

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