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Total Questions : 868 | Page 14 of 87 pages
Question 131. Which is a neutral refractory?
  1.    Graphite
  2.    Magnesite chrome
  3.    Silica
  4.    Magnesia
 Discuss Question
Answer: Option A. -> Graphite
Question 132. Ferromagnetic ceramic material is not used in the
  1.    Thermal insulation
  2.    Transformers
  3.    Magnetic switches
  4.    Television sets
 Discuss Question
Answer: Option A. -> Thermal insulation
Question 133. Which is an acidic refractory?
  1.    Magnesite
  2.    Dolomite
  3.    Fireclay
  4.    Chrome magnesite
 Discuss Question
Answer: Option C. -> Fireclay
Question 134. Electrical resistor bars are made of
  1.    Silicon carbide
  2.    Alumina
  3.    Zirconia
  4.    Graphite
 Discuss Question
Answer: Option A. -> Silicon carbide
Question 135. Chrome magnesite brick is not used for lining the
  1.    Hearth of soaking pits
  2.    Bottom hearth of reheating furnace
  3.    Coke oven regenerator
  4.    Burning zone of limestone rotary kilns
 Discuss Question
Answer: Option C. -> Coke oven regenerator
Question 136. Silicon carbide refractories have very low
  1.    Refractoriness (< 1700°C)
  2.    Thermal conductivity
  3.    Resistance to thermal shock
  4.    None of these
 Discuss Question
Answer: Option D. -> None of these
Question 137. Fusion temperature of pure silica (SiO₂) is __________ °C.
  1.    1350
  2.    1715
  3.    2570
  4.    2800
 Discuss Question
Answer: Option B. -> 1715
Question 138. Spray test determines the __________ of refractories.
  1.    Resistance to slag penetration
  2.    Resistance to CO attack
  3.    RUL
  4.    Permanent linear change
 Discuss Question
Answer: Option A. -> Resistance to slag penetration
Question 139. The main raw material for manufacture of silicon carbide refractories is
  1.    Corrundum
  2.    Carborundum
  3.    Bauxite
  4.    Periclase
 Discuss Question
Answer: Option B. -> Carborundum
Question 140. Which of the following consumes the maximum tonnage of refractories annually in an integrated steel plant?
  1.    Soaking pits
  2.    Ceheating furnace
  3.    L.D. converter
  4.    Rotary lime kiln
 Discuss Question
Answer: Option C. -> L.D. converter

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