Lessing ring is formed by the addition of a partition across the centre of a raschig ring, which results in an area increase of about ______________ percent?

Related Mcqs:

Chrome magnesite bricks are_________________?

A. Acidic in nature B. Neutral in nature C. Having higher RUL than silica bricks D. Made by mixing 30% Chromite and 70% Periclase...

Segar cones are used for the determination of ____________ of refractories?

A. Softening temperature B. Spalling resistance C. Electrical conductivity D. Resistance to slag attack...

____________ of carbon blocks in the hearth of blast furnace helps in avoiding skull formation, when it becomes cold?

A. High thermal conductivity B. Low porosity C. Non-wetting characteristics D. High density...

Pick out the wrong statement?

A. Fluxing material like lime is added in clay to reduce the vitrification temperature B. Main constituents of clay are alumina and silica C. Addition of sand in ceramic materials makes it non-plastic, increases its fusion point and reduces its shrinkage on burning D. Vitrification of fireclay material is done to increase its porosity...

Spray test determines the _____________ of refractories?

A. Resistance to slag penetration B. Resistance to CO attack C. RUL D. Permanent linear change...