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MCQs

Total Questions : 222 | Page 22 of 23 pages
Question 211. The operating voltage of super-tension cables is up to
  1.    11 kV
  2.    33 kV
  3.    3.3 kV
  4.    6.6 kV
 Discuss Question
Answer: Option B. -> 33 kV
Question 212. Skin effect is proportional to
  1.    (conductor diameter)1/2
  2.    None of these
  3.    (conductor diameter)3
  4.    (conductor diameter)2
  5.    (conductor diameter)4
 Discuss Question
Answer: Option D. -> (conductor diameter)2
Question 213. Which of the following characteristics should the line supports for transmission lines possess?
  1.    High mechanical strength
  2.    All of these
  3.    Low cost
  4.    Longer life
 Discuss Question
Answer: Option B. -> All of these
Question 214. Transmission line insulators are made of
  1.    porcelain
  2.    glass
  3.    iron
  4.    P.V.C.
 Discuss Question
Answer: Option A. -> porcelain
Question 215. The square root of the ratio of line impedance and shunt admittance is called the
  1.    Regulation of the line
  2.    Surge impedance of the line
  3.    None of these
  4.    Conductance of the line
 Discuss Question
Answer: Option B. -> Surge impedance of the line
Question 216. Which of the following faults is most likely to occur in cables?
  1.    Open circuit fault
  2.    Breakdown of cable insulation
  3.    Cross or short-circuit fault
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Question 217. Which of the following is the source of heat generation in the cables?
  1.    All of these
  2.    Dielectric losses in cable insulation
  3.    losses in the conductor
  4.    Losses in the metallic sheathings and armourings
 Discuss Question
Answer: Option A. -> All of these
Question 218. 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.    Kirchhoff's law
  3.    Faraday's law
  4.    Ohm's law
 Discuss Question
Answer: Option A. -> Kelvin's law
Question 219. Besides a method of trial and error, which of the following methods is employed for solution of network problems in interconnected system?
  1.    All of these
  2.    Circulating current method
  3.    Thevenin's theorem
  4.    Superposition of currents
 Discuss Question
Answer: Option A. -> All of these
Question 220. The loads on distributors systems are generally
  1.    None of these
  2.    Unbalanced
  3.    Balanced
  4.    Either of the above
 Discuss Question
Answer: Option B. -> Unbalanced

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