Lakshya Education MCQs

Question: Porosity of silica bricks varies from __________ percent.
Options:
A.5 to 10
B.20 to 30
C.45 to 60
D.60 to 75
Answer: Option B

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More Questions on This Topic :

Question 1. Maximum alumina content in high alumina refractory can be as high as __________ percent.
  1.    30
  2.    50
  3.    70
  4.    90
Answer: Option D
Question 2. 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
Answer: Option D
Question 3. 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
Answer: Option D
Question 4. 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
Answer: Option C
Question 5. 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
Answer: Option A
Question 6. An ideal refractory should have high
  1.    Spalling rate
  2.    Fusion point
  3.    Shrinkage ability
  4.    None of these
Answer: Option B

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