Answer / sneha

DUE TO VARIATIONS IN VOLTAGES,VARYING MAGNETIC FIELD IS
PRODUCED & THIS VARYING MAGNETIC FIELD CHANGES DIMENSION OF
FERROMAGNETIC ELEMENT USED AS A TRANSFORMER ELEMENT & IT
APPEARS AS A VIBRASIONS.THIS VIBRATIONS ARE SOURCE OF THE
NOISE.

Answer / sheikh

Commonly new and quality wise transformer not producing too noise but due to magnetizing + mutual induction transformer creating some noise . old transformer which is cores becoming loose may producing heavier noise.

What will happen if 60 Hz rated transformer is connected to the supply of 50 Hz say 415 V (3-phase) step up to 3.3 kV...?? ?

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