Which of the following is the most likely source of harmonics in a transformer ?

Related Mcqs:

1. The main reason for generation of harmonics in a transformer could be_______________?

   A. fluctuating load
   B. poor insulation
   C. mechanical vibrations
   D. saturation of core

2. Harmonics in transformer result in___________?

   A. increased core losses
   B. increased I2R losses
   C. magnetic interference with communication circuits
   D. all of the above

3. 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

4. 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

5. Which of the following does not change in a transformer ?

   A. Current
   B. Voltage
   C. Frequency
   D. All of the above

6. Which of the following is not a part of transformer installation ?

   A. Conservator
   B. Breather
   C. Buchholz relay
   D. Exciter

7. While conducting short-circuit test on a transformer the following side is short circuited?

   A. High voltage side
   B. Low voltage side
   C. Primary side
   D. Secondary side

8. In the transformer following winding has got more cross-sectional area______________?

   A. Low voltage winding
   B. High voltage winding
   C. Primary winding
   D. Secondary winding

9. Which of the following does not change in an ordinary transformer ?

   A. Frequency
   B. Voltage
   C. Current
   D. Any of the above

10. Which of the following properties is not necessarily desirable for the material for transformer core ?

    A. Low hysteresis loss
    B. High permeability
    C. High thermal conductivity
    D. Adequate mechanical strength