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MCQs

Total Questions : 868 | Page 83 of 87 pages
Question 821. The highest melting pure oxide (m.p. > 3000°C)is___________________?
  1.    Thoria
  2.    Alumina
  3.    Beryllia
  4.    Zirconia
 Discuss Question
Answer: Option A. -> Thoria
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 822. Crushing strength of a refractory____________________?
  1.    Increases with rise in service temperature
  2.    Decreases with rise in service temperature
  3.    Is unaffected with change in service temperature
  4.    Decreases with increase in porosity
 Discuss Question
Answer: Option B. -> Decreases with rise in service temperature
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 823. Slide gates in teeming laddie used for steel pouring in ingot moulds is lined with _____________ bricks?
  1.    Bakelite impregnated or fused periclase
  2.    Silica
  3.    Semi-silica
  4.    Fireclay
 Discuss Question
Answer: Option A. -> Bakelite impregnated or fused periclase
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 824. Colour of fireclay bricks is_________________?
  1.    Light buff to reddish buff
  2.    Yellow
  3.    Black
  4.    None of these
 Discuss Question
Answer: Option A. -> Light buff to reddish buff
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 825. Highest melting (m.p = 3070°C) oxide refractory is__________________?
  1.    Alumina
  2.    Thoria
  3.    Zirconia
  4.    Magnesia
 Discuss Question
Answer: Option B. -> Thoria
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 826. The largest consumer of refractories is the _______________ industry?
  1.    Cement
  2.    Metallurgical
  3.    Fertiliser
  4.    Power
 Discuss Question
Answer: Option B. -> Metallurgical
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 827. Hot blast main (carrying air at 1000°C) in blast furnace are lined with ______________ bricks?
  1.    Silica
  2.    Fireclay
  3.    Magnesite
  4.    Zirconia
 Discuss Question
Answer: Option B. -> Fireclay
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 828. Refractoriness under loads (RUL) is quite close to the fusion temperature (PCE) for _____________ bricks?
  1.    Fireclay
  2.    Silica
  3.    Dolomite
  4.    Very low alumina
 Discuss Question
Answer: Option B. -> Silica
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 829. Dilatometer is used for the determination of ______________ of refractories?
  1.    Modulus of rupture
  2.    Permanent linear change
  3.    Resistance to CO attack
  4.    RUL
 Discuss Question
Answer: Option B. -> Permanent linear change
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 830. The maximum linear expansion of silica bricks during firing is about ______________ percent?
  1.    0.5
  2.    1
  3.    2
  4.    3.5
 Discuss Question
Answer: Option D. -> 3.5
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

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