Q. 51 With both 
open, the core flux waveform will be
The star-delta transformer shown above is excited on the star side with balanced,
4-wire, 3-phase, sinusoidal voltage supply of rated magnitude. The transformer is
under no load condition
(A) a sinusoid at fundamental frequency
(B) flat-topped with third harmonic
(C) peaky with third-harmonic
(D) none of these
Answer:(B)
Explanation:
