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MCQs

Total Questions : 222 | Page 8 of 23 pages
Question 71. The phenomenon of rise in voltage at the receiving end of the open-circuited or lightly loaded line is called the
  1.    See-back effect
  2.    Ferranti effect
  3.    Raman effect
  4.    None of the above
 Discuss Question
Answer: Option B. -> Ferranti effect
Question 72. Series capacitors on transmission lines are of little use when the load VAR requirement is
  1.    Large
  2.    Small
  3.    Fluctuating
  4.    Any of the above
 Discuss Question
Answer: Option B. -> Small
Question 73. The voltage of the single phase supply to residential consumers is
  1.    110 V
  2.    210 V
  3.    230 V
  4.    400 V
 Discuss Question
Answer: Option C. -> 230 V
Question 74. The conductors of the overhead lines are
  1.    solid
  2.    stranded
  3.    both solid and stranded
  4.    none of the above
 Discuss Question
Answer: Option C. -> both solid and stranded
Question 75. The wooden poles well impregnated with creosite oil or any preservative compound have life
  1.    from 2 to 5 years
  2.    10 to 15 years
  3.    25 to 30 years
  4.    60 to 70 years
 Discuss Question
Answer: Option C. -> 25 to 30 years
Question 76. The use of strain type insulators is made where the conductors are
  1.    Dead ended
  2.    At intermediate anchor towers
  3.    Any of the above
  4.    None of the above
 Discuss Question
Answer: Option C. -> Any of the above
Question 77. As compared to a 2-wire D.C. distributor, a 3-wire distributor with same maximum voltage to earth uses only
  1.    31.25 percent of copper
  2.    33.3 percent of copper
  3.    66.7 percent of copper
  4.    125 percent of copper
 Discuss Question
Answer: Option A. -> 31.25 percent of copper
Question 78. Large industrial consumers are supplied electrical energy at
  1.    400 V
  2.    11 kV
  3.    66 kV
  4.    400 kV
 Discuss Question
Answer: Option C. -> 66 kV
Question 79. A circuit is disconnected by isolators when
  1.    Line is energized
  2.    There is no current in the line
  3.    Line is on full load
  4.    Circuit breaker is not open
 Discuss Question
Answer: Option B. -> There is no current in the line
Question 80. In a substation the following equipment is not installed
  1.    Exciters
  2.    Series capacitors
  3.    Shunt reactors
  4.    Voltaire transformers
 Discuss Question
Answer: Option A. -> Exciters

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