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Multiple Choice Questions Related with Transformers.
#1. Transformers are working on the principle of.....?
#2. The rating of transformer expressed in.....?
#3. A transformer varies the output.....?
#4. The efficiency of the transformer is generally.....?
#5. Transformers operates.....?
#6. Which material is most suitable for making transformer core is.....?
reduce hysteresis loss
#7. Stepped core arrangement in larger transformer reduce....?
#8. Area of hysteresis loop represents....?
#9. The transformer used for AC welding is.....?
#10. A transformer has maximum efficiency at full load, when iron losses are 800 watts copper losses at half load will be....?
half load = 800/4=200w
#11. The purpose of conservator in transformer is....?
#12. Power transformer are designed for maximum efficiency occurs at.....?
#13. Transformer core is laminated to avoid loss of energy due to....?
#14. Which material used for making transformer core?
#15. Buchholz relay is used for...?
#16. In tansformer zero voltage regulation at full load is possible at..?
#17. A transformer has negative voltage regulation when its load power factor is....?
#18. In a 3 phase 5kV 5MVA system, what is the base impedence?
#19. The purpose of oil in a transformer is to.....?
#20. Short circuit test of transformer gives.....losses?
#21. Open circuit test of transformer gives.....losses?
#22. The standard value of secondary current of current transformer is....?
#23. A transformer steps up the voltage by a factor 100. the ratio of current in the primary to that in the secondary is....?
#24. Efficiency of a two identical transformers under load conditions can be determined by....?
#25. Ordinary transformer doesnot change its.....?
#26. The two windings of transformer are.....?
#27. The iron core of transformer provide ..... path to the main flux?
#28. An ideal transformer doesnot change its.....?
#29. The condition of maximum efficiency of the transformer is that.....?
#30. The core loss in a transformer is constant during....?
#31. Which type of winding used in shell type transformer?
#32. In a transformer conservator placed on....?
#33. A transformer has full load copper loss is 800 W. at half load copper loss is.....?
#34. During open circuit test of a transformer primary is supplied at....?
#35. If dc voltage is applied to the primary of a transformer it may?
#36. A distribution transformer usually is a....?
#37. In an ideal transformer, the no load primary current ......?
#38. In any single phase transformer the primary and secondary induced voltages are......?
#39. No load current of a transformer interms of the full load current is usually.....?
#40. The all day efficiency of a transformer is the ratio of the......?
#41. Distribution transformers designed for maximum efficiency at .....%?
#42. Natural air cooling transformers of rating upto.....?
#43. A buchholz relay is used for protection against.....?
#44. Scott connection are used for.....?
#45. In scott connection, teaser transformer operates on 0.866 of its rated....?
#46. Constant current transformer is of.....type?
#47. The size of transformer core depends upon....?
#48. Which is the common method of cooling a power transformer?
#49. In scott connection the neutral point divides the teaser winding in the ratio of.....?
#50. In a three phase delta transformer, one of the phase burnt. the transformer will supply.....?
#51. The main purpose of core in a transformer is to.....?
#52. Buchholz relay is ...... type relay?
#53. Turns ratio of isolation or one to one transformer is.....?
#54. The type of transformer used in battery charger is...?
#55. The essential condition for the parallel operation of two single phase transformers should be.....?
#56. The condition for maximum efficiency in a transformer is.....?
#57. The impedance ratio of transformer is equal to....?
#58. Scott connection of transformer is also known as....?
#59. A transformer has negative voltage regulation when its load power factor is....?
#60. A T-T transformer cannot be paralleled with ….transformer?
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