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MCQs

Total Questions : 222 | Page 3 of 23 pages
Question 21. On which of the following factors skin effect depends?
  1.    Frequency of the current
  2.    Size of the conductor
  3.    Resistivity of the conductor material
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 22. Which of the following characteristics should the line supports for transmission lines possess?
  1.    Low cost
  2.    High mechanical strength
  3.    Longer life
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 23. A feeder, in a transmission system, feeds power to
  1.    Distributors
  2.    Generating stations
  3.    Service mains
  4.    All of the above
 Discuss Question
Answer: Option A. -> Distributors
Question 24. Transmission line insulators are made of
  1.    glass
  2.    porcelain
  3.    iron
  4.    P.V.C.
 Discuss Question
Answer: Option B. -> porcelain
Question 25. Skin effect is proportional to
  1.    (conductor diameter)1/2
  2.    (conductor diameter)4
  3.    (conductor diameter)2
  4.    (conductor diameter)3
  5.    none of the above
 Discuss Question
Answer: Option C. -> (conductor diameter)2
Question 26. The operating voltage of high voltage cables is up to
  1.    l.lkV
  2.    3.3kV
  3.    6.6kV
  4.    llkV
 Discuss Question
Answer: Option D. -> llkV
Question 27. Besides a method of trial and error, which of the following methods is employed for solution of network problems in interconnected system?
  1.    Circulating current method
  2.    Thevenin's theorem
  3.    Superposition of currents
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 28. If variable part of annual cost on account of interest and depreciation on the capital outlay is equal to the annual cost of electrical energy wasted in the conductors, the total annual cost will be minimum and the corresponding size of conductor will be most economical. This statement is known as
  1.    Kelvin's law
  2.    Ohm's law
  3.    Kirchhoff's law
  4.    Faraday's law
 Discuss Question
Answer: Option A. -> Kelvin's law
Question 29. Which of the following is the source of heat generation in the cables?
  1.    Dielectric losses in cable insulation
  2.    losses in the conductor
  3.    Losses in the metallic sheathings and armourings
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 30. Which of the following faults is most likely to occur in cables?
  1.    Cross or short-circuit fault
  2.    Open circuit fault
  3.    Breakdown of cable insulation
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above

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