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MCQs

Total Questions : 53 | Page 5 of 6 pages
Question 41. Which forming method is used for the production of hollow glasses?
  1.    Blowing
  2.    Pressing
  3.    Drawing
  4.    Casting
 Discuss Question
Answer: Option A. -> Blowing
Answer: (a).Blowing
Question 42. Which method of forming cannot be used to produce sheet glass?
  1.    Floating
  2.    Rolling
  3.    Drawing
  4.    Casting
 Discuss Question
Answer: Option D. -> Casting
Answer: (d).Casting
Question 43. The temperature at which a non-crystalline material transforms from a supercooled liquid to rigid glass is __________
  1.    Melting point
  2.    Glass transition temperature
  3.    Boiling point
  4.    Crystalline temperature
 Discuss Question
Answer: Option B. -> Glass transition temperature
Answer: (b).Glass transition temperature
Question 44. How is the hardness of an elastomer measured?
  1.    Bloom
  2.    Brinnell hardness test
  3.    Rockwell hardness test
  4.    Shore durometer
 Discuss Question
Answer: Option D. -> Shore durometer
Answer: (d).Shore durometer
Question 45. What is Buna N rubber?
  1.    Styrene-butadiene
  2.    Chloroprene
  3.    Polyisoprene
  4.    Acrylonitrile butadiene
 Discuss Question
Answer: Option D. -> Acrylonitrile butadiene
Answer: (d).Acrylonitrile butadiene
Question 46. What is the thermal conductivity of rubber?
  1.    0.04 W/m °C
  2.    0.16 W/m °C
  3.    0.64 W/m °C
  4.    1.12 W/m °C
 Discuss Question
Answer: Option B. -> 0.16 W/m °C
Answer: (b).0.16 W/m °C
Question 47. What is the trade name for natural polyisoprene?
  1.    Natural rubber
  2.    Neoprene
  3.    Silicone
  4.    Buna acrylonitrile
 Discuss Question
Answer: Option A. -> Natural rubber
Answer: (a).Natural rubber
Question 48. What is the percentage of elongation of styrene butadiene?
  1.    450-500%
  2.    400-600%
  3.    500-700%
  4.    800%
 Discuss Question
Answer: Option A. -> 450-500%
Answer: (a).450-500%
Question 49. What is the service temperature of polysiloxane?
  1.    -50 to 150
  2.    -50 to 105
  3.    -60 to 120
  4.    -90 to 250
 Discuss Question
Answer: Option D. -> -90 to 250
Answer: (d).-90 to 250
Question 50. Which of the following is not a characteristic of natural rubber?
  1.    Cheap
  2.    High strength
  3.    High hysteresis
  4.    Abrasion and tear resistant
 Discuss Question
Answer: Option C. -> High hysteresis
Answer: (c).High hysteresis

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