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MCQs

Total Questions : 71 | Page 7 of 8 pages
Question 61. If power factor is less than unity then it will result in
  1.    Large kVA rating of equipment
  2.    Greater conductor size
  3.    Large copper losses
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 62. A _________ distribution system is more reliable than the ______ distribution system
  1.    parallel, radial
  2.    parallel, ring
  3.    radial, parallel
  4.    ring, parallel
 Discuss Question
Answer: Option A. -> parallel, radial
Question 63. When alternating current passes through a conductor
  1.    it remains uniformly distributed throughout the section of conductor
  2.    portion of conductor near the surface carries more current as compared to the core
  3.    portion of conductor near the surface carries less current as compared to the core
  4.    entire current passes through the core of the conductor.
 Discuss Question
Answer: Option B. -> portion of conductor near the surface carries more current as compared to the core
Question 64. The steady state stability of the power system can be improved by
  1.    Increasing the number of parallel lines between the transmission points
  2.    Connecting capacitors in series with the line
  3.    Reducing the excitation of the machines
  4.    Both a and b
 Discuss Question
Answer: Option D. -> Both a and b
Question 65. The rated voltage of a 3 phase power system is given by
  1.    rms peak voltage
  2.    Peak phase voltage.
  3.    rms line to line voltage
  4.    Peak line to line voltage.
 Discuss Question
Answer: Option C. -> rms line to line voltage
Question 66. Which type of system is generally adopted for the generation and transmission of electrical power?
  1.    3 phase 4 wire
  2.    2 phase 3 wire
  3.    3 phase 3 wire
  4.    None of these
 Discuss Question
Answer: Option C. -> 3 phase 3 wire
Question 67. The stability of the power system is not affected by which among these?
  1.    Generator reactance
  2.    Line losses
  3.    Excitation of generators
  4.    All of these
 Discuss Question
Answer: Option B. -> Line losses
Question 68. By using which component can the transient stability limit of a power system be improved?
  1.    Series resistance
  2.    Series capacitor
  3.    Series inductor
  4.    a. Shunt resistance
 Discuss Question
Answer: Option B. -> Series capacitor
Question 69. Various power system faults in increasing order of severity are
  1.    LG,LL,LLG,LLLG
  2.    LLLG,LLG,LG,LL
  3.    LLG,LLLG,LL,LG
  4.    LL,LG,LLLG,LLG
 Discuss Question
Answer: Option A. -> LG,LL,LLG,LLLG
Question 70. What percentage of fault occurring in the power system is line to line fault
  1.    5 %
  2.    30 %
  3.    25 %
  4.    15 %
 Discuss Question
Answer: Option D. -> 15 %

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