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Q: Refractory bricks are generally used to resist.
  • A. Chemical action
  • B. dampness
  • C. high temperature
  • D. weathering action
Correct Answer: Option C - Refractory bricks are made from fire clay. The process of manufacturing is as of an ordinary brick, burnt at very high temperatures in special kilns (Hoffman's kiln). • In that type of bricks the lime and iron oxide are present about 2% to 4%. Strength is 125kg/cm² and water absorption about 5% to 10% to its dry weight. • Colour is whitish yellow or light brown. These are used for lining blast furnaces, oven, kilns, boilers and chimneys. Acid refractory bricks, basic refractory brick and Neutral refractory bricks are the varieties of fire–clay bricks.
C. Refractory bricks are made from fire clay. The process of manufacturing is as of an ordinary brick, burnt at very high temperatures in special kilns (Hoffman's kiln). • In that type of bricks the lime and iron oxide are present about 2% to 4%. Strength is 125kg/cm² and water absorption about 5% to 10% to its dry weight. • Colour is whitish yellow or light brown. These are used for lining blast furnaces, oven, kilns, boilers and chimneys. Acid refractory bricks, basic refractory brick and Neutral refractory bricks are the varieties of fire–clay bricks.

Explanations:

Refractory bricks are made from fire clay. The process of manufacturing is as of an ordinary brick, burnt at very high temperatures in special kilns (Hoffman's kiln). • In that type of bricks the lime and iron oxide are present about 2% to 4%. Strength is 125kg/cm² and water absorption about 5% to 10% to its dry weight. • Colour is whitish yellow or light brown. These are used for lining blast furnaces, oven, kilns, boilers and chimneys. Acid refractory bricks, basic refractory brick and Neutral refractory bricks are the varieties of fire–clay bricks.