Pick out the wrong statement.

Refractories used in muffle furnace should have low thermal conductivity

Answer

The electrical resistivity of refractories drops rapidly with rise in temperature

For reducing spalling tendency, the refractory should be well fired and its porosity should be more

Refractoriness under load (RUL) of a refractory is always less than its refractoriness

Answer: Option A

Answer: Option A

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