In an actual transformer the iron loss remains practically constant from no load to full load because:____________?

primary voltage remains constant

value of transformation ratio remains constant

permeability of transformer core remains constant

core flux remains practically constant

secondary voltage remains constant

In an actual transformer the iron loss remains practically constant f

1.	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
E.	secondary voltage remains constant
Answer» D. primary voltage remains constant