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Q: Refractory bricks resist
  • A. high temperature
  • B. chemical action
  • C. action of frost
  • D. All of the above
Correct Answer: Option A - A fire brick or refractory brick is a block of refractory ceramic material used in lining furnaces, kilns, fireboxes and fireplaces. A refractory brick is built primarily to withstand high temperature, but will also usually have a low thermal conductivity for greater energy efficiency of fine bricks are used for increasing heat flow.
A. A fire brick or refractory brick is a block of refractory ceramic material used in lining furnaces, kilns, fireboxes and fireplaces. A refractory brick is built primarily to withstand high temperature, but will also usually have a low thermal conductivity for greater energy efficiency of fine bricks are used for increasing heat flow.

Explanations:

A fire brick or refractory brick is a block of refractory ceramic material used in lining furnaces, kilns, fireboxes and fireplaces. A refractory brick is built primarily to withstand high temperature, but will also usually have a low thermal conductivity for greater energy efficiency of fine bricks are used for increasing heat flow.