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MCQs

Total Questions : 631 | Page 3 of 64 pages
Question 21. Short circuit test on transformers is conducted to determine
  1.    hysteresis losses
  2.    copper losses
  3.    core losses
  4.    eddy current losses
 Discuss Question
Answer: Option B. -> copper losses
Question 22. In a certain transformer, the input power to the primary is 120 W. If 8.5 W are lost to the winding resistance, what is the output power to the load, neglecting any other issues?
  1.    0 W
  2.    14.1 W
  3.    111.5 W
  4.    1,020 W
 Discuss Question
Answer: Option C. -> 111.5 W
Question 23. Which of the following acts as a protection against high voltage surges due to lightning and switching?
  1.    Horn gaps
  2.    Thermal overload relays
  3.    Breather
  4.    Conservator
 Discuss Question
Answer: Option A. -> Horn gaps
Question 24. Auto-transformer makes effective saving on copper and copper losses, when its transformation ratio is
  1.    approximately equal to one
  2.    less than one
  3.    great than one
  4.    none of the above
 Discuss Question
Answer: Option A. -> approximately equal to one
Question 25. The power factor of an induction motor under no-load conditions will be closer to
  1.    0.2 lagging
  2.    0.2 leading
  3.    0.5 leading
  4.    unity
 Discuss Question
Answer: Option A. -> 0.2 lagging
Question 26. The path of a magnetic flux in a transformer should have
  1.    high resistance
  2.    high reluctance
  3.    low resistance
  4.    low reluctance
 Discuss Question
Answer: Option D. -> low reluctance
Question 27. The path of the magnetic flux in transformer should have
  1.    high reluctance
  2.    low reactance
  3.    high resistance
  4.    low resistance
 Discuss Question
Answer: Option B. -> low reactance
Question 28. The permissible flux density in case of cold rolled grain oriented steel is around
  1.    1.7 Wb/m²
  2.    2.7 Wb/m²
  3.    3.7 Wb/m²
  4.    4.7 Wb/m²
 Discuss Question
Answer: Option A. -> 1.7 Wb/m²
Question 29. No-load current of a transformer has
  1.    has high magnitude and low power factor
  2.    has high magnitude and high power factor
  3.    has small magnitude and high power factor
  4.    has small magnitude and low power factor
 Discuss Question
Answer: Option D. -> has small magnitude and low power factor
Question 30. In a step-down transformer, there is a change of 15 A in the load current. This results in change of supply current of
  1.    less than 15 A
  2.    more than 15 A
  3.    15 A
  4.    none of the above
 Discuss Question
Answer: Option A. -> less than 15 A

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