An ideal transformer will have maximum efficiency at a load such that?

Related Mcqs:

1. For a transformer, operating at constant load current, maximum efficiency will occur at______________?

   A. 0.8 leading power factor B. 0.8 lagging power factor C. zero power factor D. unity power factor...

2. The no-load current drawn by transformer is usually what per cent of the full-load current ?

   A. 0.2 to 0.5 per cent B. 2 to 5 per cent C. 12 to 15 per cent D. 20 to 30 per cent...

3. 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...

4. The efficiency of a transformer will be maximum when_____________?

   A. copper losses = hysteresis losses B. hysteresis losses = eddy current losses C. eddy current losses = copper losses D. copper losses = iron losses...

5. The maximum efficiency of a distribution transformer is____________?

   A. at no load B. at 50% full load C. at 80% full load D. at full load...

6. The maximum load that a power transformer can carry is limited by its________________?

   A. temperature rise B. dielectric strength of oil C. voltage ratio D. copper loss...

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. An ideal transformer has infinite values of primary and secondary inductances. The statement is______________?

   A. true B. false...

10. An ideal transformer is one which has_____________?

    A. no losses and magnetic leakage B. interleaved primary and secondary windings C. a common core for its primary and secondary windings D. core of stainless steel and winding of pure copper metal E. none of the above...