THREE PHASE TRANSFORMER MCQs – CHAPTER 2 DAE

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1. A three-phase transformer can be constructed by;





2. The primary and secondary windings of a three-phase transformer are usually connected in;





3. The voltage transformation ratio of a three-phase transformer is equal to;





4. The power rating of a three-phase transformer is equal to;





5. The efficiency of a three-phase transformer is maximum when;





6. The equivalent resistance and reactance of a three-phase transformer referred to the primary side are given by;





7. The voltage regulation of a three-phase transformer is defined as;





8. The short circuit test on a three-phase transformer is used to determine;





9. The open circuit test on a three-phase transformer is used to determine;





10. The polarity of a three-phase transformer is determined by;





11. The ratio of the kVA ratings of the primary and secondary windings of a three-phase transformer is equal to;





12. The three phase transformer connections that can provide a 30-degree phase shift between the primary and secondary line voltages are;





13. The three phase transformer connections that can provide a zero-phase shift between the primary and secondary line voltages are;





14. The three phase transformer connections that can provide a 180-degree phase shift between the primary and secondary line voltages are;





15. The advantage of using a three-phase transformer over three single phase transformers is that;





16. The disadvantage of using a three-phase transformer over three single phase transformers is that;





17. The parallel operation of three phase transformers is possible when they have the same;





18. The load sharing among parallel connected three phase transformers is proportional to their;





19. The auto-transformer connection for a three-phase transformer is obtained by;





20. The advantage of using an auto-transformer connection for a three-phase transformer is that;





21. The disadvantage of using an auto-transformer connection for a three-phase transformer is that;





22. The Scott connection for a three-phase transformer is used to;





23. The advantage of using a Scott connection for a three-phase transformer is that;





24. The disadvantage of using a Scott connection for a three-phase transformer is that;





25. The tertiary winding in a three-phase transformer is used to;





26. The harmonic currents and voltage distortion in a three-phase transformer are caused by;





27. The three-limb core type construction for a three-phase transformer is preferred over the five-limb core type because;





28. The shell type construction for a three-phase transformer is preferred over the core type because;





29. The cooling methods for a three-phase transformer are classified according to;





30. The most commonly used cooling method for a large three-phase transformer is;





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