Thoria is an expensive refractory material and is radioactive in nature. Thorium oxide is used in the manufacture of______________?

Related Mcqs:

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?

A. 5 B. 20 C. 35 D. 55...

Which one contains maximum percentage of Al2O3 ?

A. Firebrick B. Sillimanite C. Magnesite D. Aluminous firebrick...

Which of the following is not a neutral refractory ?

A. Silicon carbide B. Magnesite C. Chromite D. Graphite...

Porosity of silica bricks varies from ______________ percent?

A. 5 to 10 B. 20 to 30 C. 45 to 60 D. 60 to 75...

Carbon refractories_____________________?

A. Do not burn/oxidise, when exposed to air on heating B. Are not attacked by slags, as they are not wetted by melts C. Do not resist temperature fluctuations D. Have extremely low thermal & electrical conductivities...