Pick out the wrong statement. Options: A . &nbspRefractories used in muffle furnace should have low thermal conductivity. B . &nbspThe electrical resistivity of refractories drops rapidly with rise in temperature. C . &nbspFor reducing spalling tendency, the refractory should be well fired and its porosity should be more. D . &nbspRefractoriness under load (RUL) of a refractory is always less than its refractoriness.

Pick

Question

Pick out the wrong statement.

Options:

A . Refractories used in muffle furnace should have low thermal conductivity.

B . The electrical resistivity of refractories drops rapidly with rise in temperature.

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

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

Answer: Option A

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