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: