Question # 1

The main constituents of ___________ are boron oxide and silica.

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Pyrex glass

Low silica glass

Soda lime glass

Super hard glass

What is defined as an intimate mechanical mixture of two or more phases having a definite composition and a definite temperature of transformation within the solid state.

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Pearlite

Eutechtoid

Delta solid solution

None of these

What corrosion occurs under organic coating on metals as fine wavy hairlines?

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Stray current corrosion

Microbiological corrosion

Filiform corrosion

Simple corrosion

Which of the following glass transmits the maximum light.

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Serrated glass

Clear glass

Milk glass

Opalescent glass

In a system of designating wrought aluminum alloys. what does the second digit represents.

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The purity of aluminum

The identity of the alloy

The modification of the alloy group or impurity limits

None of above

What is the ASTM tension testing designation for standard method for steel products.

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A 370

E 345

E8

E 9

What refers to the deterioration of material by oscillatory relative motion of small amplitude between two solid surfaces in a corrosive environment?

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Stray current corrosion

Microbiologicla corrosion

Fretting corrosion

None of these

Washing soap can be prepared by saponification with alkali of _____ of the following oil.

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Rose oil

Paraffin oil

Groundnut oil

Coconut oil

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 number of Glass products now manufactured is.

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25,000

75,000

50,000

All of these

Granulated sugar contains _____________% sucrose

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80

99.30

60

90

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

Manganese steel usually contains how many percent of manganese.

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1 to 5

3 to 10

11 to 14

14 to 18

To obtain cement dry powder, lime stones and shales or their slurry, is burnt in a rotary kiln at a temeperature between

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1100 ^o and 1200 ^oC

1200 ^o and 1300 ^oC

1400 ^o and 1500 ^oC

1900^o and 2000 ^oC

What is prefix in steel identification means it is made in an electric furnaced.

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E

H

B

Z

What is clinker.

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Roasted calcareous material

Roasted argillaceous material

Roasted calcareous and argillaceous material

Roasted gypsum

Refining is

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Extracting petroleum gas

Separation of various fraction

Heating of coal

All of above

What refers to the tin mill steel, without a coating.

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White plate

Black plate

Tin steel free

Dichromate tin

Galvanized steel are steel products coated with

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Carbon

Sulphur

Zinc

Iron

The different types of glass are.

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A- glass, C-Glass, E-Glass and S-Glass

A-Glass, B-Glass, E-Glass, S-Glass

AR -Glass, C-Glass, E-Glass and S -Glass

A-B Glass

Indicate the false statement about corrosion.

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Plastics and ceramics are immune to many forms of corrosion because they are not good conduction of electricity.

The corroded member in a corrosion cell is the cathode

Passivity is a prerequisite for the corrosion protect on many metals

None of these

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