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Refractory technology
| 1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
| 2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
| Q1 ⇒ RUL of refractories depends on the all (a), (b) and (c). [other wrong options] [Discuss in forum] |
| Q2 ⇒ Which is not a basic refractory ? Silicon carbide [other wrong options] [Discuss in forum] |
| Q3 ⇒ High porosity refractory bricks have all (a), (b) and (c). [other wrong options] [Discuss in forum] |
| Q4 ⇒ Walls, roofs & combustion chambers of annealing furnaces are made of __________ bricks. high duty fireclay [other wrong options] [Discuss in forum] |
| Q5 ⇒ The linear thermal expansion of __________ bricks upto 1000 °C is very low of the order of ≤ 0.5 percent. fireclay [other wrong options] [Discuss in forum] |
| Q6 ⇒ Insulating refractories should have low thermal conductivity [other wrong options] [Discuss in forum] |
| Q7 ⇒ Maximum safe working temperature for fireclay bricks is about __________ °C. 1550 [other wrong options] [Discuss in forum] |
| Q8 ⇒ Alumina-graphite bricks are used for lining the both (a) and (b). [other wrong options] [Discuss in forum] |
| Q9 ⇒ __________ nozzles are used in continuous casting of steel, Zircon [other wrong options] [Discuss in forum] |
| Q10 ⇒ High density refractory bricks have lower spalling resistance. [other wrong options] [Discuss in forum] |
| Q11 ⇒ Refractory bricks having lower porosity have greater strength [other wrong options] [Discuss in forum] |
| Q12 ⇒ Pick out the wrong statement. Superduty fireclay bricks correspond to a pyrometric cone equivalent of 26-28. [other wrong options] [Discuss in forum] |
| Q13 ⇒ Silica bricks are never used for lining the beehive coke ovens. [other wrong options] [Discuss in forum] |
| Q14 ⇒ Which form of silica has the highest specific gravity ? Quartz [other wrong options] [Discuss in forum] |
| Q15 ⇒ Addition of zircon to silica refractory brick improves its resistance to slag attack [other wrong options] [Discuss in forum] |
| Q16 ⇒ Thermal spalling mainly occurs during __________ of furnaces. both (a) & (b) [other wrong options] [Discuss in forum] |
| Q17 ⇒ Dilatometer is used for the determination of __________ of refractories. permanent linear change [other wrong options] [Discuss in forum] |
| Q18 ⇒ Furnace atmosphere for softening temperature determination of refractories (in which segar cones are placed) should be either (a) or (b) [other wrong options] [Discuss in forum] |
| Q19 ⇒ Carbon refractories are not attacked by slags, as they are not wetted by melts. [other wrong options] [Discuss in forum] |
| Q20 ⇒ Which of the following bricks should not be used, if the furnace is to be used intermit-tantly ? Silica bricks [other wrong options] [Discuss in forum] |
| Or |