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MCQs

Total Questions : 74 | Page 2 of 8 pages
Question 11. What is the tensile strength of aluminum oxide?
  1.    175 MPa
  2.    210 MPa
  3.    415 MPa
  4.    550 MPa
 Discuss Question
Answer: Option B. -> 210 MPa
Answer: (b).210 MPa
Question 12. Which among the following exhibits the highest thermal conductivity?
  1.    Alumina
  2.    Silicon carbide
  3.    Silicon nitride
  4.    Sialon
 Discuss Question
Answer: Option B. -> Silicon carbide
Answer: (b).Silicon carbide
Question 13. Which of the following is a characteristic of alumina?
  1.    Excellent hardness
  2.    Good tensile strength
  3.    Good toughness
  4.    Poor wear resistance
 Discuss Question
Answer: Option A. -> Excellent hardness
Answer: (a).Excellent hardness
Question 14. Which class of engineering ceramics generally includes lubricant materials?
  1.    Sulphides
  2.    Carbides
  3.    Metalloids
  4.    Intermetallics
 Discuss Question
Answer: Option A. -> Sulphides
Answer: (a).Sulphides
Question 15. What is the coefficient of thermal expansion of silicon carbide?
  1.    9 * 10⁻⁶
  2.    4.3 * 10⁻⁶
  3.    3.2 * 10⁻⁶
  4.    10.6 * 10⁻⁶
 Discuss Question
Answer: Option B. -> 4.3 * 10⁻⁶
Answer: (b).4.3 * 10⁻⁶
Question 16. What disadvantage does silicon carbide have?
  1.    Tensile strength
  2.    Oxidation resistance
  3.    Thermal conductivity
  4.    Cost
 Discuss Question
Answer: Option D. -> Cost
Answer: (d).Cost
Question 17. Which of the following is not a type of silicon nitride ceramics?
  1.    Reaction bonded silicon nitride
  2.    Hot pressed silicon nitride
  3.    Stiff silicon nitride
  4.    Pressure-less sintered silicon nitride
 Discuss Question
Answer: Option C. -> Stiff silicon nitride
Answer: (c).Stiff silicon nitride
Question 18. Silicon carbides resist oxidation up to ______
  1.    100°C
  2.    500°C
  3.    1000°C
  4.    1500°C
 Discuss Question
Answer: Option D. -> 1500°C
Answer: (d).1500°C
Question 19. Partially stabilized zirconia does not exist in which crystalline structure?
  1.    Cubic
  2.    Tetragonal
  3.    Hexagonal
  4.    MonoCyclic
 Discuss Question
Answer: Option C. -> Hexagonal
Answer: (c).Hexagonal
Question 20. Acetals retain their properties up to ______
  1.    50°C
  2.    120°C
  3.    240°C
  4.    420°C
 Discuss Question
Answer: Option B. -> 120°C
Answer: (b).120°C

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