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MCQs

Total Questions : 164 | Page 4 of 17 pages
Question 31. If a cable of homogeneous insulation has a maximum stress of 10 kV/mm, then the dielectric strength of insulation should be
  1.    5 kV/mm
  2.    10 kV/mm
  3.    15 kV/mm
  4.    30 kV/mm
 Discuss Question
Answer: Option B. -> 10 kV/mm
Question 32. If the length of a cable is doubled, its capacitance
  1.    Becomes one-fourth
  2.    Becomes one-half
  3.    Becomes double
  4.    Remains unchanged
 Discuss Question
Answer: Option C. -> Becomes double
Question 33. Cables for 220 kV lines are invariably
  1.    Mica insulated
  2.    Paper insulated
  3.    Compressed oil or compressed gas insulated
  4.    Rubber insulated
 Discuss Question
Answer: Option C. -> Compressed oil or compressed gas insulated
Question 34. The metallic sheath may be made of lead or lead alloy or of aluminum.
  1.    Yes
  2.    No
 Discuss Question
Answer: Option B. -> No
Question 35. The insulating material should have
  1.    Low permittivity
  2.    High resistivity
  3.    High dielectric strength
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 36. The current carrying capacity of cables in D.C. is more than that in A.C. mainly due to
  1.    Absence of harmonics
  2.    Nonexistence of any stability limit
  3.    Smaller dielectric loss
  4.    Absence of ripples
 Discuss Question
Answer: Option C. -> Smaller dielectric loss
Question 37. Which of the following insulation is used in cables?
  1.    Varnished cambric
  2.    Rubber
  3.    Paper
  4.    Any of the above
 Discuss Question
Answer: Option D. -> Any of the above
Question 38. Is a cable is to be designed for use on 1000 kV, which insulation would you prefer ?
  1.    Polyvinyle chloride
  2.    Vulcanised rubber
  3.    Impregnated paper
  4.    Compressed SFe gas
  5.    none of the above
 Discuss Question
Answer: Option D. -> Compressed SFe gas
Question 39. It is difficult to maintain oil filled cables.
  1.    Yes
  2.    No
 Discuss Question
Answer: Option A. -> Yes
Question 40. The electrostatic stress in underground cables is
  1.    Same at the conductor and the sheath
  2.    Minimum at the conductor and maximum at the sheath
  3.    Maximum at the conductor and minimum at the sheath
  4.    Zero at the conductor as well as on the sheath
 Discuss Question
Answer: Option C. -> Maximum at the conductor and minimum at the sheath

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