Chemical Engineering - Refractory Technology
Exercise :: Refractory Technology - Section 3
21.
Refractories used in/for __________ should have low thermal conductivity.
A. coke ovens B. insulation C. regenerators D. muffle furnaces
Answer: Option B
Explanation:
22.
10 to 30% magnesite is added to chromite to produce chrome-magnesite refractories. Magnesite addition is mainly done to improve the __________ of chromite.
A. spalling resistance B. refractoriness C. crushing strength D. resistance to slag
Answer: Option A
Explanation:
23.
Silica bricks are never used for lining the
A. beehive coke ovens. B. by-product coke ovens. C. dome of blast furnace stoves. D. roof of open hearth furnace.
Answer: Option A
Explanation:
24.
Which is not a natural insulating material?
A. Diatomaceous earth/kieselgur B. Asbestos C. Vermiculite D. None of these
Answer: Option D
Explanation:
25.
Magnesite refractories are generally not used in the
A. electric furnace walls. B. steel melting furnace. C. open hearth furnace. D. burning zone of cement kilns.
Answer: Option B
Explanation:
