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- Question
Spray test determines the __________ of refractories.
Options- A. resistance to slag penetration
- B. resistance to CO attack
- C. RUL
- D. permanent linear change
- Correct Answer
- resistance to slag penetration
- 1. Magnesite bricks are used in those parts of furnaces, which are
Options- A. subjected to temperature fluctuation.
- B. required to resist corrosive basic slag.
- C. subjected to high load.
- D. none of these. Discuss
- 2. With increase in the porosity, thermal spalling resistance of fireclay brick
Options- A. increases
- B. decreases
- C. remains same
- D. may increase or decrease Discuss
- 3. Beryllia (which is used in making crucibles for melting uranium & thorium) is superior to alumina in all respects for high temperature (> 1900°C ) use, except
Options- A. cost
- B. electrical conductivity
- C. thermal conductivity
- D. fusion point Discuss
- 4. Resistance to slag attack of a refractory
Options- A. depends on the nature of slag & refractory.
- B. decreases at higher temperature.
- C. decreases, if defective joints & cracks exist in the refractory.
- D. all (a), (b) and (c). Discuss
- 5. Which is not a basic refractory?
Options- A. Chrome magnesite
- B. Magnesite
- C. Dolomite
- D. Silicon carbide Discuss
- 6. Natural rubber is obtained from latex, which is a colloidal dispersion of rubber in water. Which of the following is used as a coagulant in latex?
Options- A. Ammonium alum
- B. Potassium alum
- C. both a & b
- D. neither a nor b Discuss
- 7. Transistor parts and refrigerator components are normally made of
Options- A. polystyrene
- B. polyester
- C. high density polythene
- D. polyurathane Discuss
- 8. 90% of the caprolactum is converted to nylon-6 on its condensation polymerisation in the reactor maintained at a temperature of __________ °C.
Options- A. -5
- B. 10-30
- C. 250-280
- D. 500-600 Discuss
- 9. Peptizers like aromatic mercaptans (e.g. thiophenes) are added in rubber to
Options- A. protect rubber goods from attack by oxygen & ozone present in the atmosphere.
- B. reduce its viscosity to permit easier processing.
- C. reduce the time of vulcanisation and quantity of vulcanising agent.
- D. increase its viscosity. Discuss
- 10. Due to its excellent permeability to air/gas and oxidation resistance, the tubes of automobile tyres is made of
Options- A. cold SBR
- B. butyl rubber
- C. Bunai N
- D. Buna S Discuss
Refractory Technology problems
Search Results
Correct Answer: required to resist corrosive basic slag.
Correct Answer: increases
Correct Answer: cost
Correct Answer: all (a), (b) and (c).
Correct Answer: Silicon carbide
Correct Answer: both a & b
Correct Answer: polystyrene
Correct Answer: 250-280
Correct Answer: reduce its viscosity to permit easier processing.
Correct Answer: butyl rubber
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