Hysteresis loss in a transformer varies as CBmax = maximum flux density) ? - PakMcqs

Related Mcqs:

1. The use of higher flux density in the transformer design____________?

   A. reduces weight per kVA B. reduces iron losses C. reduces copper losses D. increases part load efficiency...

2. The path of a magnetic flux in a transformer should have______________?

   A. high resistance B. high reluctance C. low resistance D. low reluctance...

3. The value of flux involved m the e.m.f. equation of a transformer is____________?

   A. average value B. r.m.s. value C. maximum value D. instantaneous value...

4. The leakage flux in a transformer depends upon______________?

   A. load current B. load current and voltage C. load current, voltage and frequency D. load current, voltage, frequency and power factor...

5. The path of the magnetic flux in transformer should have____________?

   A. high reluctance B. low reactance C. high resistance D. low resistance...

6. The permissible flux density in case of cold rolled grain oriented steel is around__________?

   A. 1.7 Wb/m2 B. 2.7 Wb/m2 C. 3.7 Wb/m2 D. 4.7 Wb/m2...

7. 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...

8. 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...

9. In an actual transformer the iron loss remains practically constant from no load to full load because:____________?

   A. value of transformation ratio remains constant B. permeability of transformer core remains constant C. core flux remains practically constant D. primary voltage remains constant C. secondary voltage remains constant...

10. Iron loss of a transformer can be measured by____________?

    A. low power factor wattmeter B. unity power factor wattmeter C. frequency meter D. any type of wattmeter...