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MCQs

Total Questions : 66 | Page 2 of 7 pages
Question 11. Yttrium-iron-garnet is used as microwave isolators in the ____ range.
  1.    KHz
  2.    MHz
  3.    GHz
  4.    THz
 Discuss Question
Answer: Option C. -> GHz
Answer: (c).GHz
Question 12. How does moisture affect the thermal insulation of a body?
  1.    Increases
  2.    Decreases
  3.    Unaltered
  4.    Becomes zero
 Discuss Question
Answer: Option A. -> Increases
Answer: (a).Increases
Question 13. Which of the following is a requirement for thermal insulation in materials?
  1.    High specific gravity
  2.    High specific heat
  3.    Low thermal conductivity
  4.    Non-inflammability
 Discuss Question
Answer: Option C. -> Low thermal conductivity
Answer: (c).Low thermal conductivity
Question 14. What is the coercive force of high carbon steel?
  1.    3.98
  2.    5.57
  3.    18.31
  4.    60
 Discuss Question
Answer: Option A. -> 3.98
Answer: (a).3.98
Question 15. What is the value of residual induction of alnico alloys?
  1.    0.9
  2.    0.95
  3.    1.0
  4.    0.8-1.2
 Discuss Question
Answer: Option C. -> 1.0
Answer: (c).1.0
Question 16. An insulating material named 85% magnesia can be used up to temperatures of _______
  1.    120°C
  2.    250°C
  3.    315°C
  4.    460°C
 Discuss Question
Answer: Option C. -> 315°C
Answer: (c).315°C
Question 17. Which of the following is an example of organic insulating material?
  1.    Wood-pulp
  2.    Charcoal
  3.    Slag
  4.    Asbestos
 Discuss Question
Answer: Option A. -> Wood-pulp
Answer: (a).Wood-pulp
Question 18. Which of the following is a cause for an increase in insulation?
  1.    Increase in thickness
  2.    Decrease in thickness
  3.    Decrease in cost
  4.    Low density
 Discuss Question
Answer: Option A. -> Increase in thickness
Answer: (a).Increase in thickness
Question 19. A cork insulation with a waterproof binder is used for _______ surfaces.
  1.    Soft
  2.    Hot
  3.    Cold
  4.    Hard
 Discuss Question
Answer: Option C. -> Cold
Answer: (c).Cold
Question 20. An insulating material made from ______ is preferred for applications where vibration resistance is vital.
  1.    Asbestos
  2.    Magnesium carbonate
  3.    Rock wool
  4.    Cattle hair
 Discuss Question
Answer: Option D. -> Cattle hair
Answer: (d).Cattle hair

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