Electrical Engineering : Electrical Machine Design QUESTIONS AND ANSWERS :: part3 : 21 to 25
Following Electrical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2024 and IES 2024 examinations :
21.In transformers using hot rolled steel, the cross-section of the yoke is made about _____ greater than that of the core |
| 5 percent |
| 10 percent |
| 15 percent |
| 30 percent |
22.Power transformers should be designed to have maximum efficiency |
| at one-fourth load |
| at one-half load |
| at or near full load |
| any of the above |
23.For large power transformers, self oil cooled type or air blast type which of the following values of current density may be used ? |
| 1.0 to 1.2 A/mm2 |
| 1.5 to 2.0 A/mm2 |
| 2.2 to 3.2 A/mm2 |
| 3.2 to 4.2 A/mm2 |
24.Multi-layer helical windings are commonly used in the transformers as high voltage windings |
| upto 20 kV |
| upto 50 kV |
| upto 80 kV |
| for 110 kV and above |
More Electrical Machine Design QUESTIONS AND ANSWERS available in next pages
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