Refractory Technology(Chemical Engineering ) Questions and Answers

Question 1. Which furnace consumes maximum refractory annually in an integrated steel plant?
  1.    Soaking pit
  2.    Blastfurnace
  3.    L.D. converter
  4.    Coke ovens
Explanation:-
Answer: Option C. -> L.D. converter
Question 2. Fireclay bricks are used in the
  1.    Furnaces allowed to cool frequently
  2.    Flues
  3.    Chimney linings
  4.    All of the above
Explanation:-
Answer: Option D. -> All of the above
Question 3. 'Spinel', a refractory mineral is chemically represented as
  1.    MgAl2O₄
  2.    MgAl2O₃
  3.    MgSO₄
  4.    MgAl2O₃.2H₂O
Explanation:-
Answer: Option A. -> MgAl2O₄
Question 4. Because of its very high refractoriness of the order of __________ °C, silicon carbide refractories are used in zinc smelting furnace, muffle furnace and for supporting the wares in tunnel kilns.
  1.    1800
  2.    2200
  3.    2400
  4.    2700
Explanation:-
Answer: Option D. -> 2700
Question 5. Skull is not formed on the carbon blocks in the hearth of a blast furnace, when it becomes cold, becaus of its
  1.    Non-wetting characteristic
  2.    High thermal conductivity
  3.    High crushing strength
  4.    None of these
Explanation:-
Answer: Option A. -> Non-wetting characteristic
Question 6. 10 to 30% magnesite is added to chromite to produce chrome-magnesite refractories. Magnesite addition is mainly done to improve the __________ of chromite.
  1.    Spalling resistance
  2.    Refractoriness
  3.    Crushing strength
  4.    Resistance to slag
Explanation:-
Answer: Option A. -> Spalling resistance
Question 7. A steel member used in the furnace construction to take the thrust of the brickwork is called
  1.    Buckstay
  2.    Breast wall
  3.    Armouring
  4.    Baffle
Explanation:-
Answer: Option A. -> Buckstay
Question 8. Porosity is induced in insulating refractories by adding
  1.    Powdered naphthalene
  2.    Ammonium chloride/sulphate
  3.    Calcium phosphate
  4.    All of the above
Explanation:-
Answer: Option D. -> All of the above
Question 9. Pick out the wrong statement.
  1.    A ceramic material which becomes fluid upon heating and can be moulded in liquid/viscous state is termed s glass
  2.    Ceramic materials do not undergo vitrification on heating
  3.    Ceramic materials are brittle in nature
  4.    Non-oxide ceramic materials generally act as a semi-conductor
Explanation:-
Answer: Option B. -> Ceramic materials do not undergo vitrification on heating
Question 10. Which is a basic refractory?
  1.    Fireclay
  2.    Silica
  3.    Chrome magnesite
  4.    None of these
Explanation:-
Answer: Option C. -> Chrome magnesite
© Lakshya_Education.com, All Right Reserved.
Contact Us services