For a synchronous machine, assume terminal voltage V = 1.0 p.u and synchronous reactance Xs p.u and armature resistance Ra =0 Ω and excitation voltage is 2.0 p.u. The reactive power when the machine is working as a synchronous motor at no-load is -0.8 p.u. Then the value synchronous reactance Xs in p.u is______
1
1
2
0.8
3
1.5
4
1.25
5
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