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Electrical Transformer Quiz #5.
- 25 Questions (Selected Randomly)
- 25 Marks (1 Mark/Question)
- 25 Minutes of Time
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- Answered
- Review
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Question 1 of 25
1. Question
The amount of copper in the primary is ….. that of secondary.
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Question 2 of 25
2. Question
A transformer has full load copper loss of 400 W. The copper loss at half full load will be …..
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Question 3 of 25
3. Question
A transformer has 200 W as an iron loss at full load. The iron loss at half full-load will be …..
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Question 4 of 25
4. Question
In a practical transformer, copper losses account for about ….. of the total losses.
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Question 5 of 25
5. Question
With a load of leading power factor, the full load secondary voltage of the transformer is ….. its no-load voltage.
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Question 6 of 25
6. Question
Which of the following is not the basic elements of the transformer?
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Question 7 of 25
7. Question
In an ideal transformer ……
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Question 8 of 25
8. Question
The main purpose of using core in the transformer is to …..
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Question 9 of 25
9. Question
The transformer core is laminated in order to …..
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Question 10 of 25
10. Question
The primary and secondary induced EMF E1 and E2 in a two winding transformer are always …..
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Question 11 of 25
11. Question
A step-up transformer increases …..
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Question 12 of 25
12. Question
The primary and secondary winging of an ordinary two winding transformer always have …..
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Question 13 of 25
13. Question
In a transformer, the leakage flux of each winding is proportional to the current in that winding because,
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Question 14 of 25
14. Question
In a two winding transformer, the EMF per turn in the secondary winding is always ….. the induced EMF power turn in the primary.
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Question 15 of 25
15. Question
In relation to a transformer, the ratio 20:1 indicates that …..
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Question 16 of 25
16. Question
In performing the short circuit test of a transformer …..
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Question 17 of 25
17. Question
A transformer has negative voltage regulation when its load power factor is …..
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Question 18 of 25
18. Question
No-load test on a transformer is carried out to determine …..
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Question 19 of 25
19. Question
The main purpose of performing an open circuit test on a transformer is to measure its …..
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Question 20 of 25
20. Question
During the short circuit test, the iron loss of a transformer is negligible because, …..
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Question 21 of 25
21. Question
In operating a 400 Hz transformer at 50 Hz …..
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Question 22 of 25
22. Question
Transformer is rated in kVA instead of kW because, …..
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Question 23 of 25
23. Question
When 400 Hz transformer is operated at 50Hz its kVA rating is …..
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Question 24 of 25
24. Question
A relatively light load, transformer efficiency is low because,
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Question 25 of 25
25. Question
The ordinary efficiency of a given transformer is maximum when …..