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MCQs

Total Questions : 53 | Page 3 of 6 pages
Question 21. Buna S rubbers consisting of over 50% styrene are considered as _________
  1.    Polymer
  2.    Plastic
  3.    Fibers
  4.    Whisker
 Discuss Question
Answer: Option B. -> Plastic
Answer: (b).Plastic
Question 22. What is Hypalon?
  1.    Polysulphide
  2.    Urethane
  3.    Chlorosulfonyl polyethylene
  4.    Isobutylene Isoprene
 Discuss Question
Answer: Option C. -> Chlorosulfonyl polyethylene
Answer: (c).Chlorosulfonyl polyethylene
Question 23. How much sulfur must be added to rubber for vulcanization?
  1.    1-5%
  2.    7-20%
  3.    25-35%
  4.    > 40%
 Discuss Question
Answer: Option A. -> 1-5%
Answer: (a).1-5%
Question 24. What is the glass transition temperature of polybutadiene?
  1.    -100 F
  2.    -25 F
  3.    125 F
  4.    300 F
 Discuss Question
Answer: Option A. -> -100 F
Answer: (a).-100 F
Question 25. What is ACM elastomer?
  1.    Isobutylene Isoprene
  2.    Ethylene propylene
  3.    Polyacrylate
  4.    Polybutadiene
 Discuss Question
Answer: Option C. -> Polyacrylate
Answer: (c).Polyacrylate
Question 26. What is the tensile strength of vulcanized rubber?
  1.    10 kg/cm²
  2.    70 kg/cm²
  3.    700 kg/cm²
  4.    105 kg/cm²
 Discuss Question
Answer: Option C. -> 700 kg/cm²
Answer: (c).700 kg/cm²
Question 27. Injection molding uses a _________ for unvulcanized rubber.
  1.    Geneva mechanism
  2.    Screw mechanism
  3.    Dwell cam
  4.    Linkage
 Discuss Question
Answer: Option B. -> Screw mechanism
Answer: (b).Screw mechanism
Question 28. ________ is the process of spreading sheets of compound over a fabric.
  1.    Compression molding
  2.    Extrusion
  3.    Calendering
  4.    Vacuum forming
 Discuss Question
Answer: Option C. -> Calendering
Answer: (c).Calendering
Question 29. Which of these is not an ln operation of calendering?
  1.    Sheeting
  2.    Frictioning
  3.    Skim coating
  4.    Buffing
 Discuss Question
Answer: Option D. -> Buffing
Answer: (d).Buffing
Question 30. Warming up of a compound and feeding it to an extruder is the operation of _________
  1.    Tubing
  2.    Tumbling
  3.    Buffing
  4.    Trimming
 Discuss Question
Answer: Option A. -> Tubing
Answer: (a).Tubing

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