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MCQs

Total Questions : 222 | Page 9 of 23 pages
Question 81. The distributors for residential areas are
  1.    Single phase
  2.    Three-phase three wire
  3.    Three-phase four wire
  4.    None of the above
 Discuss Question
Answer: Option C. -> Three-phase four wire
Question 82. The material commonly used for insulation in high voltage cables is
  1.    Lead
  2.    Paper
  3.    Rubber
  4.    None of the above
 Discuss Question
Answer: Option B. -> Paper
Question 83. The material generally used for armour of high voltage cables is
  1.    Aluminium
  2.    Steel
  3.    Brass
  4.    Copper
 Discuss Question
Answer: Option B. -> Steel
Question 84. Which of the following bus-bar schemes has the lowest cost?
  1.    Ring bus-bar scheme
  2.    Single bus-bar scheme
  3.    Breaker and a half scheme
  4.    Main and transfer scheme
 Discuss Question
Answer: Option B. -> Single bus-bar scheme
Question 85. JCorona usually occurs when the electrostatic stress in air around the conductor exceeds
  1.    6.6 kV (r.m.s. value)/cm
  2.    11 kV (r.m.s. value)/cm
  3.    22 kV (maximum value)/cm
  4.    30 kV (maximum value)/cm
 Discuss Question
Answer: Option D. -> 30 kV (maximum value)/cm
Question 86. For aluminium, as compared to copper, all the following factors have higher values except
  1.    Specific volume
  2.    Electrical conductivity
  3.    Coefficient of linear expansion
  4.    Resistance per unit length for same cross-section
 Discuss Question
Answer: Option B. -> Electrical conductivity
Question 87. 310 km line is considered as
  1.    A long line
  2.    A medium line
  3.    A short line
  4.    Any of the above
 Discuss Question
Answer: Option A. -> A long line
Question 88. In a tap changing transformer, the tappings are provided on
  1.    Primary winding
  2.    Secondary winding
  3.    High voltage winding
  4.    Any of the above
 Discuss Question
Answer: Option C. -> High voltage winding
Question 89. Galvanized steel wire is generally used as
  1.    Stay wire
  2.    Earth wire
  3.    Structural components
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 90. In the analysis of which of the following lines shunt capacitance is neglected?
  1.    Short transmission lines
  2.    Medium transmission lines
  3.    Long transmission lines
  4.    Medium as well as long transmission lines
 Discuss Question
Answer: Option A. -> Short transmission lines

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