Electrical resistor bars are made of _______________?

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...

Magnesite refractories have low resistance to___________________?

A. Attack by basic slag B. Abrasion C. Disintegration on sudden change of temperature D. Both B. and C....

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

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