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MCQs

Total Questions : 868 | Page 7 of 87 pages
Question 61. An ideal refractory should have high
  1.    Spalling rate
  2.    Fusion point
  3.    Shrinkage ability
  4.    None of these
 Discuss Question
Answer: Option B. -> Fusion point
Question 62. Which is the stable form of silica between 1470°C and the melting point 1713°C ?
  1.    Cristobalite
  2.    Tridymite
  3.    Quartz
  4.    None of these
 Discuss Question
Answer: Option A. -> Cristobalite
Question 63. Furnace atmosphere for softening temperature determination of refractories (in which segar cones are placed) should be
  1.    Oxidising
  2.    Neutral
  3.    Either A or B
  4.    Neither A nor B
 Discuss Question
Answer: Option C. -> Either A or B
Question 64. Porosity of silica bricks varies from __________ percent.
  1.    5 to 10
  2.    20 to 30
  3.    45 to 60
  4.    60 to 75
 Discuss Question
Answer: Option B. -> 20 to 30
Question 65. Maximum alumina content in high alumina refractory can be as high as __________ percent.
  1.    30
  2.    50
  3.    70
  4.    90
 Discuss Question
Answer: Option D. -> 90
Question 66. Maximum water percentage in refractory mix meant for hand moulding may be as high as __________ percent.
  1.    2-3
  2.    5-7
  3.    7-12
  4.    14-20
 Discuss Question
Answer: Option D. -> 14-20
Question 67. Pure bauxite is the best raw material for the manufacture of high alumina refractories, in which maximum alumina content can be as high as __________ percent.
  1.    55
  2.    70
  3.    80
  4.    90
 Discuss Question
Answer: Option D. -> 90
Question 68. Maximum shrinkage in volume occurring during burning/firing of dried refractories may be as high as __________ percent.
  1.    10
  2.    15
  3.    20
  4.    30
 Discuss Question
Answer: Option D. -> 30
Question 69. In panel test for spalling resistance, the average face temperature of panel assembly is maintained at __________ °C for 24 hours.
  1.    700
  2.    1000
  3.    1600
  4.    2000
 Discuss Question
Answer: Option C. -> 1600
Question 70. Periclase refractory contains mainly
  1.    CaO
  2.    MgO
  3.    Al2O₃
  4.    SiO₂
 Discuss Question
Answer: Option B. -> MgO

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