#1. The no-load current in a transformer is primarily used to:
#2. What is the common insulation used in transformers?
#3. A transformer has a primary voltage of 220V and a secondary voltage of 44V. If the primary current is 2A, what is the secondary current?
#4. The maximum value of induced EMF in a transformer occurs when:
#5. The core of a transformer is usually made of thin sheets of steel to:
#6. The turns ratio of a transformer is related to the:
#7. In a transformer, the primary and secondary windings are connected:
#8. If a transformer is overloaded, it will:
#9. In a transformer, a higher frequency will cause:
#10. What is the efficiency of an ideal transformer?
#11. The magnetic flux in a transformer varies with:
#12. The loss in a transformer’s core is primarily due to:
#13. The primary winding of a transformer carries:
#14. In a transformer, the power factor is:
#15. The primary coil of a transformer has 200 turns, and the secondary coil has 50 turns. If the primary voltage is 400V, what is the secondary voltage?
#16. In a transformer, the current in the secondary winding is inversely proportional to the:
#17. If a transformer has a primary voltage of 100V and a secondary voltage of 10V, what is the turns ratio?
#18. Which of the following losses occur in the transformer’s windings?
#19. A transformer with a 1:5 turns ratio will:
#20. The current rating of a transformer is specified in:
#21. 71. A transformer operates at maximum efficiency when:
#22. A transformer can be used to:
#23. The insulation in a transformer is used to:
#24. The energy losses in a transformer are:
#25. In a step-up transformer, the primary voltage is:
#26. A transformer can be used to:
#27. The efficiency of a transformer is highest when the:
#28. The oil used in transformers:
#29. Which of the following is a feature of an autotransformer?
#30. Which transformer is used to transfer power at the same voltage level with electrical isolation?
#31. In a transformer, the primary and secondary windings are:
#32. The core material of a transformer has:
#33. Which of the following is true for an ideal transformer?
#34. A transformer with more turns in the primary winding than in the secondary winding is called a:
#35. A transformer’s performance is measured by its:
#36. The maximum core loss in a transformer occurs at:
#37. The magnetic flux in a transformer is created by:
#38. A transformer’s efficiency can be improved by:
#39. The copper loss in a transformer is proportional to:
#40. What happens when a transformer operates with a low power factor load?
#41. If the secondary coil of a transformer has more turns than the primary coil, it is a:
#42. What is the primary purpose of the core in a transformer?
#43. The current in the secondary coil of a transformer depends on the:
#44. What causes copper losses in a transformer?
#45. The number of turns in the primary coil determines:
#46. The primary current in a transformer is related to:
#47. The hysteresis loss in a transformer is:
#48. A transformer with a 1:5 turns ratio will produce a secondary voltage that is:
#49. The efficiency of a transformer is generally high, usually around:
#50. Which of the following statements is true for an ideal transformer?
Answer: B) The efficiency is always 100%.
An ideal transformer has no losses, so its efficiency is 100%, meaning the input power equals the output power.
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