Which of the following bricks should not be used, if the furnace is to be used intermittently ?

Related Mcqs:

Graphite or carbon refractories______________________?

A. Exhibit wetting characteristics B. Should be used in neutral or reducing atmosphere C. Exhibit high shrinkage on thermal treatment D. Are not resistant to corrosion by slag...

Silica refractories__________________?

A. crack when subjected to sudden change of temperature B. Cannot be used in the dome of hot blast stoves C. Have lower thermal conductivity than fireclay bricks D. All A., B. and C....

With increase in the alumina content in firebricks, its fusion point (refractoriness) ?

A. Decreases linearly B. Remains unchanged C. Increases D. Decreases...

Silica bricks have low spalling resistance below 600°C, due to its________________?

A. Very high thermal conductivity B. High co-efficient of expansion upto this temperature C. High thermal diffusivity D. Low refractoriness...

Highest melting (m.p = 3070°C) oxide refractory is__________________?

A. Alumina B. Thoria C. Zirconia D. Magnesia...