Refractory Technology problems
- 1. Maximum water percentage in refractory mix meant for hand moulding may be as high as __________ percent.
Options- A. 2-3
- B. 5-7
- C. 7-12
- D. 14-20 Discuss
Correct Answer: 14-20
- 2. High thermal conductivity of a refractory material is not important, when it is to be used in the
Options- A. coke oven regenarators
- B. muffle furnace
- C. blast furnace
- D. recuperators Discuss
Correct Answer: blast furnace
- 3. Silica bricks are attacked by basic slags at high temperature. Which of the following is not used solely as a binding material?
Options- A. aluminium phosphate
- B. water
- C. lime
- D. plaster of paris Discuss
Correct Answer: water
- 4. Fireclay bricks are never used in the
Options- A. beehive oven
- B. coke oven walls
- C. zinc roaster
- D. lead blast furnace Discuss
Correct Answer: coke oven walls
- 5. The linear thermal expansion of __________ bricks upto 1000 °C is very low of the order of ? 0.5 percent.
Options- A. fireclay
- B. silica
- C. magnesite
- D. corundum Discuss
Correct Answer: fireclay
- 6. Si percentage in silica refractories used in the walls of coke oven is about
Options- A. 45
- B. 60
- C. 80
- D. 95 Discuss
Correct Answer: 95
- 7. Refractoriness under load (RUL) is the most important property for the refractory bricks
Options- A. at the hearth bottom of the furnace on which stock is placed.
- B. used for furnace insulation.
- C. used in the roof of the furnace.
- D. none of these. Discuss
Correct Answer: at the hearth bottom of the furnace on which stock is placed.
- 8. Zircon refractories have
Options- A. low co-efficient of expansion.
- B. high RUL (1600°C) and refractoriness (> 2000°C).
- C. high spalling resistance.
- D. all (a), (b) and (c). Discuss
Correct Answer: all (a), (b) and (c).
- 9. Electrical resistor bars are made of
Options- A. silicon carbide
- B. alumina
- C. zirconia
- D. graphite Discuss
Correct Answer: silicon carbide
- 10. Maximum safe working temperature for fireclay bricks is about __________ °C.
Options- A. 1150
- B. 1300
- C. 1450
- D. 1550 Discuss
Correct Answer: 1550
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