TRANSFORMER - Quiz

1) Why distribution transformers are normally connected as primary in delta and secondary in star?

To avoid over loading To maintain constant voltage To reduce transformer losses To easy distribution of 3 phase 4 wire system

2) Which type of emf is induced in an ideal two winding transformer?

Self induced emf Mutually induced emf Statically induced emf Dynamically induced emf

3) How to determine copper loss in a transformer?

Ratio test Impulse test Short circuit test Open circuit test

4) Why ferrite core is used in radio receivers?

To reduce the constant losses To reduce electric interference To increase the quality of sound To increase the efficiency of receivers

5) What is the advantage of stepped core arrangement in larger transformers?

Minimizes copper use Reduces hysteresis loss Reduces eddy current loss Reduces the space for core