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MCQs

Total Questions : 166 | Page 12 of 17 pages
Question 111. What is the name of the fluorescent material that gives red colour fluorescence?
  1.     Zinc silicate.
  2.     Zinc sulphide.
  3.     Calcium silicate.
  4.      Magnesium silicate.
 Discuss Question
Answer: Option D. ->   Magnesium silicate.
Question 112. Find the odd one out.
  1.     Refractive index.
  2.     Dielectric strength.
  3.     Absorptivity.
  4.     Emissivity.
 Discuss Question
Answer: Option B. ->  Dielectric strength.
Question 113. Which of the following is the least desired property in magnetic materials for electrical engineering applications ?
  1.    All of these
  2.     Large hysteresis loop.
  3.     High electrical resistivity.
  4.     High magnetic permeability.
 Discuss Question
Answer: Option B. ->  Large hysteresis loop.
Question 114. Choose the best suitable of Diamagnetic : Paramagnetic::
  1.     Water : Air.
  2.     Nickel : Cobalt.
  3.     Permalloy : Super-alloy.
  4.     Iron : Steel.
 Discuss Question
Answer: Option A. ->  Water : Air.
Question 115. The numberof atoms per unit cell in a B.C.C structure is
  1.     7.
  2.     4.
  3.     2.
  4.     12.
 Discuss Question
Answer: Option C. ->  2.
Question 116. Permanent magnets are used in
  1.     generators.
  2.     loud speakers.
  3.     motors.
  4.     all of above.
 Discuss Question
Answer: Option B. ->  loud speakers.
Question 117. The magnetisation and applied field in ferromagnetic materials are related
  1.     sinusoidally.
  2.     linearly.
  3.     parabolically.
  4.     non linearly.
 Discuss Question
Answer: Option D. ->  non linearly.
Question 118. Substance having permeability less than the permeability of free space, are known as
  1.     ferromagnetic.
  2.     diamagnetic.
  3.     paramagnetic.
  4.     bipolar.
 Discuss Question
Answer: Option B. ->  diamagnetic.
Question 119. Susceptibility is negative for
  1.     diamagnetic substances.
  2.     none of above.
  3.     non magnetic substances.
  4.     ferromagnetic substances.
 Discuss Question
Answer: Option A. ->  diamagnetic substances.
Question 120. A degaussing is the process of
  1.     removing gases from materials.
  2.     remagnetising metallic parts.
  3.     removal of magnetic impurities.
  4.     demagnetising metallic parts.
 Discuss Question
Answer: Option A. ->  removing gases from materials.

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