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MCQs

Total Questions : 631 | Page 2 of 64 pages
Question 11. Which of the following is the main advantage of an auto-transformer over a two winding transformer?
  1.    Hysteresis losses are reduced
  2.    Saving in winding material
  3.    Copper losses are negligible
  4.    Eddy losses are totally eliminated
 Discuss Question
Answer: Option B. -> Saving in winding material
Question 12. Primary winding of a transformer
  1.    is always a low voltage winding
  2.    is always a high voltage winding
  3.    could either be a low voltage or high voltage winding
  4.    none of the above
 Discuss Question
Answer: Option C. -> could either be a low voltage or high voltage winding
Question 13. Negative voltage regulation is indicative that the load is
  1.    capacitive only
  2.    inductive only
  3.    inductive or resistive
  4.    none of the above
 Discuss Question
Answer: Option A. -> capacitive only
Question 14. Which motor is preferred for use in mines where explosive gases exist?
  1.    Air motor
  2.    Induction motor
  3.    Shunt motor
  4.    Synchronous motor
 Discuss Question
Answer: Option A. -> Air motor
Question 15. Which type of winding is used in 3phase shell-type transformer?
  1.    Circular type
  2.    Sandwich type
  3.    Cylindrical type
  4.    Rectangular type
 Discuss Question
Answer: Option B. -> Sandwich type
Question 16. The hum in a transformer is mainly attributed to
  1.    load changes
  2.    oil in the transformer
  3.    magnetostriction
  4.    mechanical vibrations
 Discuss Question
Answer: Option C. -> magnetostriction
Question 17. An ideal transformer is one which has
  1.    no losses and magnetic leakage
  2.    interleaved primary and secondary windings
  3.    a common core for its primary and secondary windings
  4.    core of stainless steel and winding of pure copper metal
 Discuss Question
Answer: Option A. -> no losses and magnetic leakage
Question 18. Noise level test in a transformer is a
  1.    special test
  2.    routine test
  3.    type test
  4.    none of the above
 Discuss Question
Answer: Option C. -> type test
Question 19. The 'crawling' in an induction motor is caused by
  1.    high loads
  2.    low voltage supply
  3.    improper design of machine
  4.    harmonics developed in the motor
 Discuss Question
Answer: Option D. -> harmonics developed in the motor
Question 20. Open 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 C. -> core losses

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