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MCQs

Total Questions : 868 | Page 6 of 87 pages
Question 51. Most Cermets, which normally have high thermal conductivity and high thermal shock resistance, comprises of ceramic & metallic components of __________ percent respectively.
  1.    80 and 20
  2.    20 and 80
  3.    50 and 50
  4.    60 and 40
 Discuss Question
Answer: Option A. -> 80 and 20
Question 52. Which is not a natural insulating material?
  1.    Diatomaceous earth/kieselgur
  2.    Asbestos
  3.    Vermiculite
  4.    None of these
 Discuss Question
Answer: Option D. -> None of these
Question 53. Fusion point of a basic refractory material is
  1.    Reduced by the addition of acid oxides
  2.    Increased by the addition of acid oxides
  3.    Not affected by the addition of acid oxides
  4.    Always less than 1000°C
 Discuss Question
Answer: Option A. -> Reduced by the addition of acid oxides
Question 54. Presence of MgO in alumino-silicate refractories __________ its refractoriness.
  1.    Increases
  2.    Lowers
  3.    Does not affect
  4.    Either A or B; depends on its quantity
 Discuss Question
Answer: Option B. -> Lowers
Question 55. Zirconia refractories are not used in
  1.    Making sheaths for thermocouple
  2.    Lining high temperature ceramic kilns
  3.    Furnaces subjected to fluctuating temperature
  4.    High frequency induction furnaces in the form of inductors
 Discuss Question
Answer: Option C. -> Furnaces subjected to fluctuating temperature
Question 56. Silica refractories are not used in
  1.    Coke oven walls
  2.    Beehive coke ovens
  3.    Dome and upper portion of B.F. stoves
  4.    Open hearth furnace roof
 Discuss Question
Answer: Option B. -> Beehive coke ovens
Question 57. High alumina refractories are used in the
  1.    Dome of blast furnace stoves
  2.    Electric arc furnace roof
  3.    Glass melting furnaces
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 58. Test piece for determination of RUL of a refractory is heated in a/an
  1.    Oxidising atmosphere
  2.    Reducing atmosphere
  3.    Electric furnace
  4.    Neutral atmosphere
 Discuss Question
Answer: Option C. -> Electric furnace
Question 59. Lower wall courses of soaking pits are made of __________ bricks to avoid the action of molten slag & scale.
  1.    Chrome or magnesite
  2.    Silicon carbide
  3.    Silica
  4.    Lowduty fireclay
 Discuss Question
Answer: Option A. -> Chrome or magnesite
Question 60. Spalling resistance of a refractory can not be increased by
  1.    Increasing its porosity
  2.    Using a coarser grog during its manufacture
  3.    Decreasing its thermal co-efficient of expansion
  4.    Making it denser
 Discuss Question
Answer: Option D. -> Making it denser

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