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MCQs

Total Questions : 164 | Page 8 of 17 pages
Question 71. In cables the charging current
  1.    Leads the voltage by 90°
  2.    Leads the voltage by 180°
  3.    Lags the voltage by 180°
  4.    Lags the voltage by 90°
 Discuss Question
Answer: Option A. -> Leads the voltage by 90°
Question 72. The disadvantage with paper as insulating material is
  1.    It is hygroscopic
  2.    None of the listed here
  3.    It has high capacitance
  4.    It is an organic material
 Discuss Question
Answer: Option A. -> It is hygroscopic
Question 73. PVC stands for
  1.    Pressed and varnished cloth
  2.    Post varnish conductor
  3.    Positive voltage conductor
  4.    Polyvinyl chloride
 Discuss Question
Answer: Option D. -> Polyvinyl chloride
Question 74. The relative permittivity of rubber is
  1.    Between 5 and 7
  2.    Between 2 and 3
  3.    None of the listed here
  4.    Between 8 and 9
 Discuss Question
Answer: Option B. -> Between 2 and 3
Question 75. Cables, generally used beyond 66 kV are
  1.    Armoured
  2.    Belted
  3.    S.L. type
  4.    Oil filled
 Discuss Question
Answer: Option D. -> Oil filled
Question 76. The advantage of cables over overhead transmission lines is
  1.    Easy maintenance
  2.    Can be used in congested areas
  3.    Can be used in high voltage circuits
  4.    Low cost
 Discuss Question
Answer: Option B. -> Can be used in congested areas
Question 77. The surge resistance of cable is
  1.    50 ohms
  2.    100 ohms
  3.    5 ohms
  4.    500 ohms
 Discuss Question
Answer: Option A. -> 50 ohms
Question 78. The thickness of the layer of insulation on the conductor, in cables, depends upon
  1.    Power factor
  2.    Voltage
  3.    Reactive power
  4.    Current carrying capacity
 Discuss Question
Answer: Option B. -> Voltage
Question 79. Solid type cables are considered unreliable beyond 66 kV because
  1.    Skin effect dominates on the conductor
  2.    Of corona loss between conductor and sheath material
  3.    There is a danger of breakdown of insulation due to the presence of voids
  4.    Insulation may melt due to higher temperature
 Discuss Question
Answer: Option C. -> There is a danger of breakdown of insulation due to the presence of voids
Question 80. Pressure cables are generally not used beyond
  1.    11 kV
  2.    33 kV
  3.    66 kV
  4.    132 kV
 Discuss Question
Answer: Option C. -> 66 kV

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