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MCQs

Total Questions : 164 | Page 6 of 17 pages
Question 51. In a cable the voltage stress is maximum at
  1.    Sheath
  2.    Insulator
  3.    Surface of the conductor
  4.    Core of the conductor
 Discuss Question
Answer: Option D. -> Core of the conductor
Question 52. The disadvantage with paper as insulating material is
  1.    It is hygroscopic
  2.    It has high capacitance
  3.    It is an organic material
  4.    None of the above
 Discuss Question
Answer: Option A. -> It is hygroscopic
Question 53. Which of the following protects a cable against mechanical injury?
  1.    Bedding
  2.    Sheath
  3.    Armouring
  4.    None of the above
 Discuss Question
Answer: Option C. -> Armouring
Question 54. The relative permittivity of rubber is
  1.    Between 2 and 3
  2.    Between 5 and 6
  3.    Between 8 and 10
  4.    Between 12 and 14
 Discuss Question
Answer: Option A. -> Between 2 and 3
Question 55. In cables the charging current
  1.    Lags the voltage by 90°
  2.    Leads the voltage by 90°
  3.    Lags the voltage by 180°
  4.    Leads the voltage by 180°
 Discuss Question
Answer: Option B. -> Leads the voltage by 90°
Question 56. In the cables, the location of fault is usually found out by comparing
  1.    The resistance of the conductor
  2.    The inductance of conductors
  3.    The capacitances of insulated conductors
  4.    All above parameters
 Discuss Question
Answer: Option C. -> The capacitances of insulated conductors
Question 57. In single core cables armouring is not done to
  1.    Avoid excessive sheath losses
  2.    Make it flexible
  3.    Either of the above
  4.    None of the above
 Discuss Question
Answer: Option A. -> Avoid excessive sheath losses
Question 58. The bedding on a cable consists of
  1.    Jute
  2.    Hessian cloth
  3.    None of the listed here
  4.    Both Hessian cloth and Jute
 Discuss Question
Answer: Option D. -> Both Hessian cloth and Jute
Question 59. In the cables, the location of fault is usually found out by comparing
  1.    The inductance of conductors
  2.    All of the listed here
  3.    The capacitances of insulated conductors
  4.    The resistance of the conductor
 Discuss Question
Answer: Option C. -> The capacitances of insulated conductors
Question 60. Underground cables are laid at sufficient depth
  1.    All of the listed here
  2.    To minimize temperature stresses
  3.    To minimize the effect of shocks and vibrations due to gassing vehicles, etc.
  4.    To avoid being unearthed easily due to removal of soil
 Discuss Question
Answer: Option C. -> To minimize the effect of shocks and vibrations due to gassing vehicles, etc.

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