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MCQs

Total Questions : 117 | Page 6 of 12 pages
Question 51. Errors are introduced in Current Transformers.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 52. Ratio error is due to _________
  1.    iron loss
  2.    C.T.
  3.    magnetising component
  4.    supply voltage
 Discuss Question
Answer: Option A. -> iron loss
Answer: (a).iron loss
Question 53. Phase angle error is given by ____________
  1.    \(\frac{180}{π} [\frac{1}{nI_s}]\) degrees
  2.    \(\frac{180}{π} [\frac{I_m}{I_s}]\) degrees
  3.    \(\frac{180}{π} [\frac{I_m}{n}]\)degrees
  4.    \(\frac{180}{π} [\frac{I_m}{nI_s}]\) degrees
 Discuss Question
Answer: Option D. -> \(\frac{180}{π} [\frac{I_m}{nI_s}]\) degrees
Answer: (d).\(\frac{180}{π} [\frac{I_m}{nI_s}]\) degrees
Question 54. Phase angle in a C.T. is defined as ____________
  1.    \(\frac{180}{π} [\frac{I_m cosδ}{nI_s}]\) degrees
  2.    \(\frac{180}{π} [\frac{I_c sinδ}{nI_s}]\) degrees
  3.    \(\frac{180}{π} [\frac{I_m cosδ – I_c sinδ}{nI_s}]\) degrees
  4.    \(\frac{180}{π} [\frac{I_m sinδ – I_c cosδ}{nI_s}]\) degrees
 Discuss Question
Answer: Option C. -> \(\frac{180}{π} [\frac{I_m cosδ – I_c sinδ}{nI_s}]\) degrees
Answer: (c).\(\frac{180}{π} [\frac{I_m cosδ – I_c sinδ}{nI_s}]\) degrees
Question 55. Ratio error is defined as ___________
  1.    Ratio error = Kₙ⁄R
  2.    Ratio error = (Kₙ – R)⁄R
  3.    Ratio error = Kₙ – R
  4.    Ratio error = 1⁄R
 Discuss Question
Answer: Option B. -> Ratio error = (Kₙ – R)⁄R
Answer: (b).Ratio error = (Kₙ – R)⁄R
Question 56. Phase angle error is due to _________
  1.    C.T.
  2.    magnetising component
  3.    iron loss
  4.    supply voltage
 Discuss Question
Answer: Option B. -> magnetising component
Answer: (b).magnetising component
Question 57. The secondary leakage reactance of a C.T. ____________
  1.    increases its ratio error
  2.    decreases its ratio error
  3.    has no effect on its ratio error
  4.    increases the impedance of the circuit
 Discuss Question
Answer: Option A. -> increases its ratio error
Answer: (a).increases its ratio error
Question 58. In power measurements 180° phase shift is required.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 59. Errors in a C.T. can be minimised by _________
  1.    making use of laminations
  2.    having low reactance
  3.    increasing the secondary winding turns
  4.    decreasing the primary winding turns
 Discuss Question
Answer: Option B. -> having low reactance
Answer: (b).having low reactance
Question 60. Secondary and primary windings consist of ________
  1.    copper turns
  2.    14 S.W.G copper wire and copper strip respectively
  3.    iron coils wound around
  4.    laminations
 Discuss Question
Answer: Option B. -> 14 S.W.G copper wire and copper strip respectively
Answer: (b).14 S.W.G copper wire and copper strip respectively

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