A. Cellulose
B. Asbestos
C. Mica
D. Glass fibre
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Related Mcqs:
- Gas is usually not liberated due to dissociation of transformer oil unless the oil temperature exceeds?
- A. 50°C B. 80°C C. 100°C D. 150°C...
- The changes in volume of transformer cooling oil due to variation of atmospheric temperature during day and night is taken care of by which part of transformer?
- A. Conservator B. Breather C. Bushings D. Buchholz relay...
- If a transformer is continuously operated the maximum temperature rise will occur in_______________?
- A. core B. windings C. tank D. any of the above...
- Which of the following does not change in a transformer ?
- A. Current B. Voltage C. Frequency D. All of the above...
- Which of the following property is not necessarily desirable in the material for transformer core ?
- A. Mechanical strength B. Low hysteresis loss C. High thermal conductivity D. High permeability...
- Which of the following is not a routine test on transformers ?
- A. Core insulation voltage test B. Impedance test C. Radio interference test D. Polarity test...
- Which of the following is the most likely source of harmonics in a transformer ?
- A. poor insulation B. Overload C. loose connections D. Core saturation...
- Which of the following protection is normally not provided on small distribution transformers ?
- A. Overfluxing protection B. Buchholz relay C. Overcurrent protection D. All of the above...
- Which of the following acts as a protection against high voltage surges due to lightning and switching ?
- A. Horn gaps B. Thermal overload relays C. Breather D. Conservator...
- Which of the following statements regarding an idel single-phase transformer having a turn ratio of 1 : 2 and drawing a current of 10 A from 200 V A.C. supply is incorrect?
- A. Its secondary current is 5 A B. Its secondary voltage is 400 V C. Its rating is 2 kVA D. Its secondary current is 20 A E. It is a step-up transformer...
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