Presence of MgO in alumino-silicate refractories __________ its refractoriness. Options: A . &nbspIncreases B . &nbspLowers C . &nbspDoes not affect D . &nbspEither A or B; depends on its quantity

Presence of MgO in alumino-silicate refractories _________

Question

Presence of MgO in alumino-silicate refractories __________ its refractoriness.

Options:

A . Increases

B . Lowers

C . Does not affect

D . Either A or B; depends on its quantity

Answer: Option B

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