Electrical Engineering : Electrical Machine Design QUESTIONS AND ANSWERS :: part3 : 16 to 20
Following Electrical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2024 and IES 2024 examinations :
16.The surge phenomenon is particularly important in case of |
| low voltage transformers |
| medium voltage transformers |
| high voltage transformers |
| any of the above |
17.The flash point of transformer oil should be higher than |
| 40�C |
| 60�C |
| 80�C |
| 104�C |
18.The usual values of maximum flux densities for distribution transformers using hot rolled silicon steel are |
| 0.5 to 0.8 Wb/m2 |
| 0.8 to 1.0 Wb/m2 |
| 1.1 to 1.35 Wb/m2 |
| 1.4 to 1.8 Wb/m2 |
19.A practical formula for determining the thickness of insulation between low voltage and high voltage windings is |
| 1 + 0.2 kVmm |
| 2 + 0.5 kVmm |
| 4 + 0.7 kV mm |
| 5 + 0.9 kV mm |
20.Disc windings are primarily used in |
| short capacity transformers |
| medium capacity transformers |
| high capacity transformers |
| any of the above |
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