Thoria is an expensive refractory material and is radioactive in nature. Thorium oxide is used in the manufacture of______________?
Correct answer: A. Crucibles used for melting of high purity metals
- A. Crucibles used for melting of high purity metals
- B. Muffles for muffle furnaces
- C. Insulating bricks
- D. Segar cones
Explanation
Thoria is costly and radioactive, but its very high melting point and chemical stability allow it to be used in crucibles for melting high-purity metals. These properties reduce contamination of the melt.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
Practise Plant Design and Economics
803 free Plant Design and Economics MCQs from Chemical Engineering, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Chemical Engineering questions like this
Chemical Engineering is on this paper prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for it.
More Plant Design and Economics questions
PCE value (Segar cone) of Superduty refractories is more than 33, which is equivalent to a temperature of ____________ °C?
Spray test determines the _____________ of refractories?
Fireclay refractories have __________________?
Cold crushing strength of ordinary fireclay brick is about 950 kg/cm2. On exposure to a temperature of about 1500°C, its crushing strength may come down to as low as ______________ kg/cm2?
Walls, roofs & combustion chambers of annealing furnaces are made of ______________ bricks?
With increasing alumina content, the fusion point of high alumina refractories__________________?