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MCQs

Total Questions : 515 | Page 1 of 52 pages
Question 1. Firing temperature is minimum (1250-1400 °C) for __________ bricks.
  1.    fireclay
  2.    direct bonded basic
  3.    silica
  4.    magnesite
 Discuss Question
Answer: Option A. -> fireclay
Answer: (a).fireclay
Question 2. Grog
  1.    contains both alumina and silica.
  2.    iscrushed firebrick.
  3.    is a non-plastic material.
  4.    all (a), (b) and (c).
 Discuss Question
Answer: Option D. -> all (a), (b) and (c).
Answer: (d).all (a), (b) and (c).
Question 3. Resistance to slag attack of a refractory
  1.    depends on the nature of slag & refractory.
  2.    decreases at higher temperature.
  3.    decreases, if defective joints & cracks exist in the refractory.
  4.    all (a), (b) and (c).
 Discuss Question
Answer: Option D. -> all (a), (b) and (c).
Answer: (d).all (a), (b) and (c).
Question 4. Magnesite refractories are used for the construction of those furnaces, which are
  1.    not required to resist the corrosive action of basic slag.
  2.    not subjected to fluctuation in temperature.
  3.    used for raising & maintaining high temperature.
  4.    both (b) and (c)
 Discuss Question
Answer: Option D. -> both (b) and (c)
Answer: (d).both (b) and (c)
Question 5. 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
Answer: (c).electric furnace
Question 6. The inter particle forces between linear chains in nylon-66 are __________ bonds.
  1.    hydrogen
  2.    covalant
  3.    ionic
  4.    none of these
 Discuss Question
Answer: Option A. -> hydrogen
Answer: (a).hydrogen
Question 7. Molecular weight of polymers are in the range of
  1.    10 to 10³
  2.    10²-10⁷
  3.    10⁷-10⁹
  4.    10⁹-10¹¹
 Discuss Question
Answer: Option B. -> 10²-10⁷
Answer: (b).10²-10⁷
Question 8. The physical state in which polymers exist is
  1.    melts & rubber like state.
  2.    amorphous glassy state.
  3.    partially crystalline state.
  4.    all (a), (b) and (c).
 Discuss Question
Answer: Option D. -> all (a), (b) and (c).
Answer: (d).all (a), (b) and (c).
Question 9. Orlon is
  1.    a copolymer.
  2.    a condensation polymer.
  3.    obtained by polymerising vinyl cyanide.
  4.    all (a), (b) and (c).
 Discuss Question
Answer: Option C. -> obtained by polymerising vinyl cyanide.
Answer: (c).obtained by polymerising vinyl cyanide.
Question 10. Acrylonitrile-butadiene-styrene (ABS) copolymer, which is produced by blending styrene-acrylonitfile copolymer with butadiene based elastomer, is a/an
  1.    rigid foam
  2.    engineering plastic
  3.    thermosetting polymer
  4.    spongy rubber
 Discuss Question
Answer: Option B. -> engineering plastic
Answer: (b).engineering plastic

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