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MCQs

Total Questions : 631 | Page 6 of 64 pages
Question 51. What will happen if the transformers working in parallel are not connected with regard to polarity?
  1.    The power factor of the two transformers will be different from the power factor of common load
  2.    Incorrect polarity will result in dead short circuit
  3.    The transformers will not share load in proportion to their kVA ratings
  4.    none of the above
 Discuss Question
Answer: Option B. -> Incorrect polarity will result in dead short circuit
Question 52. Transformer breaths in when
  1.    load on it increases
  2.    load on it decreases
  3.    load remains constant
  4.    none of the above
 Discuss Question
Answer: Option B. -> load on it decreases
Question 53. Material used for construction of transformer core is usually
  1.    wood
  2.    copper
  3.    aluminium
  4.    silicon steel
 Discuss Question
Answer: Option D. -> silicon steel
Question 54. Natural oil cooling is used for transformers up to a rating of
  1.    3000 kVA
  2.    1000 kVA
  3.    500 kVA
  4.    250 kVA
 Discuss Question
Answer: Option A. -> 3000 kVA
Question 55. The maximum load that a power transformer can carry is limited by its
  1.    temperature rise
  2.    dielectric strength of oil
  3.    voltage ratio
  4.    copper loss
 Discuss Question
Answer: Option C. -> voltage ratio
Question 56. Which of the following is the most likely source of harmonics in a transformer?
  1.    poor insulation
  2.    Overload
  3.    loose connections
  4.    Core saturation
 Discuss Question
Answer: Option D. -> Core saturation
Question 57. The leakage flux in a transformer depends upon
  1.    load current
  2.    load current and voltage
  3.    load current, voltage and frequency
  4.    load current, voltage, frequency and power factor
 Discuss Question
Answer: Option A. -> load current
Question 58. The noise produced by a transformer is termed as
  1.    zoom
  2.    hum
  3.    ringing
  4.    buzz
 Discuss Question
Answer: Option B. -> hum
Question 59. A no-load test is performed on a transformer to determine
  1.    core loss
  2.    copper loss
  3.    efficiency
  4.    magnetising current
  5.    magnetising current and loss
 Discuss Question
Answer: Option E. -> magnetising current and loss
Question 60. Which of the following parts of a transformer is visible from outside?
  1.    Bushings
  2.    Core
  3.    Primary winding
  4.    Secondary winding
 Discuss Question
Answer: Option A. -> Bushings

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