A. fluctuating load
B. poor insulation
C. mechanical vibrations
D. saturation of core
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Related Mcqs:
- Harmonics in transformer result in___________?
- A. increased core losses B. increased I2R losses C. magnetic interference with communication circuits D. all of the above...
- 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 is the main advantage of an auto-transformer over a two winding transformer?
- A. Hysteresis losses are reduced B. Saving in winding material C. Copper losses are negligible D. Eddy losses are totally eliminated...
- 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...
- A transformer core is laminated to__________?
- A. reduce hysteresis loss B. reduce eddy current losses C. reduce copper losses D. reduce all above losses...
- In a given transformer for given applied voltage, losses which remain constant irrespective of load changes are______________?
- A. friction and windage losses B. copper losses C. hysteresis and eddy current losses D. none of the above...
- The power transformer is a constant______________?
- A. voltage device B. current device C. power device D. main flux device...
- The chemical used in breather for transformer should have the quality of____________?
- A. ionizing air B. absorbing moisture C. cleansing the transformer oil D. cooling the transformer oil...
- Delta/star transformer works satisfactorily when______________?
- A. load is balanced only B. load is unbalanced only C. on balanced as well as unbalanced loads D. none of the above...
- Which of the following loss in a transformer is zero even at full load ____________?
- A. Core loss B. Friction loss C. Eddy current loss D. Hysteresis loss...
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