search
arrow-left Previous
Next arrow-right
Q: Which of the following statements is correct?
  • A. Excess of alumina in the clay makes the brick brittle and weak.
  • B. Excess of alumina in the clay makes the brick crack and warp on drying.
  • C. Excess of alumina in the clay leaves high power deposit on the brick.
  • D. Excess of alumina in the clay improves impermeability and durability of the brick.
Correct Answer: Option B - Alumina – • It is the chief constituent of every kind of clay. A good brick earth should contain about 20 to 30% of alumina. This constituent imparts plasticity of earth so that it can be moulded. • Excess of alumina in the clay makes the brick crack and warp on drying.
B. Alumina – • It is the chief constituent of every kind of clay. A good brick earth should contain about 20 to 30% of alumina. This constituent imparts plasticity of earth so that it can be moulded. • Excess of alumina in the clay makes the brick crack and warp on drying.

Explanations:

Alumina – • It is the chief constituent of every kind of clay. A good brick earth should contain about 20 to 30% of alumina. This constituent imparts plasticity of earth so that it can be moulded. • Excess of alumina in the clay makes the brick crack and warp on drying.