Q$.$ The readings of open circuit, short circuit, and DC bridge tests of $500V,50$kVA,$60Hz$ three$-$phase $Y-$connected alternator are given below:

$\backslash$table$[[$Open Circuit Terminal Voltage,$E_a(V),125,250,370,500,544,640],[$Short Cireuit Current,$I_a(A),-,146,220,-,-,-],[$Field Current,$I_f(A),5,10,15,20,25,30]]$

$\backslash$table$[[$Test Type,Voltage $(V),$Current $(A)$