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Ceramic materials have no free electrons so they have low electrical conductivity. However, at
high temperatures the ionic diffusion is accelerated. For example glass is an electrical insulator,
but in the glass melting furnace, its conductivity becomes quite high. Clay displays a very high
dielectric constant—a property of material related to its behaviour when located within an
electric field between two electrodes—under static conditions. However, for alternating current,
the dielectric constant in clay arises from ion and electron movement.
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- (a) What are the ceramic materials? What are their properties?
(b) Give the classification of ceramic materials.
(c) Describe, the mechanical properties of ceramics. - (a) What are refractories and their types? Give examples of each of them.
(b) Describe the thermal and electrical properties of ceramics.
(c) Describe the polymerisation of ceramics. - (a) Describe the manufacturing process of glass.
(b) What are the constituents of glass? Give the functions of each of them.
(c) Describe the classification of glass. - How are the following glasses obtained?
(a) Obscured glass (b) Milk glass
(c)Laminated glass (d) Enamel glass
(e) Flint glass (f) Tempered glass - (a) What is glass wool?
(b) What is refractoriness and how is it measured?
(c) Describe briefly the use of glass as a building material. - Describe briefly the following:
(a) Glass wool (b) Gas glass
(c)Foam glass (d) Pyrex - Describe briefly application of glass in building industry.
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- Which of the following is not a ceramic material?
(a) Glass (b) Clay
(c) Lime (d) Abrasives - Which of the following properties ceramics do not posses?
(a) Hardness (b) Brittleness
(c) Elasticity at low temperature (d) Maleability - The tensile strength of glass may be
(a) 10 N/mm^2 (b) 50 N/mm^2
(c) 80 N/mm^2 (d) 100 N/mm^2 - The accelerator added for the fusion of glass is
(a) soda (b) silica
(c) lime (d) nickel