Three units of single phase transformers and one single three-phase transformer rating

The transformer which is more feasible to use in the distribution ends should be

Shape of emf generated by delta connected transformer is not always sinusoidal.

The statements which support the points that auto transformers are advantageous I. Weight of conductor reduces II. Ohmic losses reduces III. Leakage reactance reduces IV. Lower short-circuit current

Maximum efficiency of a transformer for a constant load current , occurs at

The tappings on the transformers is provided on

Which of the following loss varies with the load

At light load transformer efficiency is less because

Material commonly used in making transformer core is

Main advantage of auto transformer over two windings transformer is that