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MCQs

Total Questions : 49 | Page 4 of 5 pages
Question 31. . One current transformer (CT) is mounted over a 3-phase 3-core cable with its sheath and armour removed from the portion covered by the CT. An ammeter placed in the CT secondary would measure
  1.    the positive sequence current
  2.    the negative sequence current
  3.    the zero sequence current
  4.    three times the zero sequence
 Discuss Question
Answer: Option D. -> three times the zero sequence
Question 32. .  Lightning arresters are used in power systems to protect electrical equipments against
  1.    direct strokes of lightning
  2.    power frequency overvoltages
  3.    overvoltages due to indirect lightning stroke
  4.    overcurrents due to lightning stroke
 Discuss Question
Answer: Option A. -> direct strokes of lightning
Question 33. .  A wave-trap is used at the termination of a HVAC overhead line to a station switchyard to
  1.    prevent the transformer magnetising harritonics from reaching the overhead line
  2.    damp the incoming surge waves from the overhead lines
  3.    attenuate sub-harmonic oscillations
  4.    provide for carrier communication
 Discuss Question
Answer: Option D. -> provide for carrier communication
Question 34. . Earth wire on EHV overhead transmission line is provided to protect the line against
  1.    lightning surge
  2.    switching surge
  3.    excessive fault voltages
  4.    corona effect
 Discuss Question
Answer: Option A. -> lightning surge
Question 35. . The velocity of travelling wave through a cable of relative permittivity 9 is
  1.    9 x 108 m/s
  2.    3 x 108 m/s
  3.    108 m/s
  4.    2 x 108 ms
 Discuss Question
Answer: Option C. -> 108 m/s
Question 36. . The principal information obtained from load flow studies in a power system are 1. magnitude and phase angle of the voltage at each bus. 2. reactive and real power flows in each of lines. 3. total power loss in the network. 4. Transient stability limit of the system Select the correct answer from the codes given below :
  1.    I and 2
  2.    3 and 4
  3.    1,2 and 3
  4.    2 and 4
 Discuss Question
Answer: Option C. -> 1,2 and 3
Question 37. . Shunt compensation in an EHV line is used to improve
  1.    stability and fault level
  2.    fault level and voltage profile
  3.    voltage profile and stability
  4.    stability, fault level and voltage profile
 Discuss Question
Answer: Option B. -> fault level and voltage profile
Question 38. .  Which fractional pitch will eliminate the seventh harmonic from the voltage waveform of an alternator?
  1.    6/7
  2.    7/8
  3.    5/6
  4.    None of the above
 Discuss Question
Answer: Option A. -> 6/7
Question 39. .  While rising and falling if a wave is not symmetrical, it contains
  1.    even harmonics in addition to fundamental
  2.    odd harmonics in addition to fundamental
  3.    both odd and even harmonics in additions to fundamental
  4.    none of the above
 Discuss Question
Answer: Option A. -> even harmonics in addition to fundamental
Question 40. .  Harmonics in transformer result in
  1.    increased core losses
  2.    increased 12R losses
  3.    magnetic interference with communication circuits
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above

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