Glass Engg-I

The primary difference between a ceramic and glass is based on its ___________ .

• solubility

• crystallinity

• conductivity

• permeability

Which of the following is not a type of glass?

• Potash-lime glass

• Soda-lime glass

• Cobalt-lead glass

• Soda-lead glass

Which of the following type of glass accounts for about 90% of manufacturing glass?

• Potash-lime glass

• Soda-lime glass

• Potash-lead glass

• Soda-lead glass

How does the addition of magnesia and alumina affect soda-lime glass?

• Enhances mechanical strength

• Reduces porosity

• Increases softening temperature

• Improves chemical durability

What is 96% silica glass used for?

• Heatshield

• Combustion tubes

• Electronic tubes

• Temperature thermometers

How much SiO2 does Pyrex contain?

• 70.3%

• 73%

• 80.5%

• 91%

What is the maximum service temperature of aluminosilicate glass?

• 220oC

• 460oC

• 650oC

• 1200oC

The two types of soda-lime glass- flat glass and container glass differ in:

• application and production method

• application and chemical composition

• production method and chemical composition

• application, production method and chemical composition

Glasses show evidence of _____ fractures.

• no

• brittle

• ductile

• oblique

The process of removal of gases from glass furnace is known as________.

• pressurization

• refining

• vaporization

• forming