Pick out the wrong statement ?

Refractory Technology 14/04/2023

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

Related Mcqs:

    Carbon refractories have very high __________________?
    A. Wetting characteristics B. Refractoriness C. Thermal conductivity D. Both B. and C....
    Semi-silica bricks compared to silica bricks have_______________?
    A. Less fusion point B. Better spalling resistance C. Both A. and B. D. Neither A. not B....
    With increase in the porosity, thermal spalling resistance of fireclay brick___________________?
    A. Increases B. Decreases C. Remain same D. May increase or decrease...
    Spalling resistance of a refractory cannot be increased by ____________________?
    A. Increasing its porosity B. Using a coarser grog during its manufacture C. Decreasing its thermal co-efficient of expansion D. Making it denser...
    Pyrometric cone equivalent (PCE) of a refractory is the measure of its_________________?
    A. Spalling resistance B. Fusion point C. Resistance to slag penetration D. Resistance to carbon monoxide attack...

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