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A 15-kVA 7000/230-V distribution transformer has an impedance referred to the primary of 80 + j300Ω. The components of the excitation branch referred to the primary side are Rc = 350 kΩ and Xm = 70 kΩ . If the primary voltage is 6900 V and the load impedance is ZL = 3.2 + j 1.5Ω, (a) the magnitude of secondary voltage of the transformer is _____V ; (b) the angle of secondary voltage of the transformer is _____degree; (c) the voltage regulation of the transformer is _____%. If the load is disconnected and a capacitor of -j3.5Ω is connected in its place, (d) the magnitude of secondary voltage of the transformer is _____V; (e) the angle of secondary voltage of the transformer is _____degree; (f) the voltage regulation of the transformer is _____%.