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The direct axis and quadrature axis reactance of a salient pole alternator are 1.2 p.u and 1.0 p.u respectively. The armature resistance is negligible. If the alternator is delivering rated kVA at upf and at rated voltage then its power angle is
1. 30°
2. 45°
3. 60°
4. 90°

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Correct Answer - Option 2 : 45°
\(\begin{array}{l} \tan {\rm{\Psi }} = \frac{{Vsin\phi + {I_a}{X_q}}}{{Vcos\phi + {I_a}{R_a}}} = \frac{{0 + 1{\rm{x}}1}}{{1{\rm{x}}1 + 0}}\\ \therefore {\rm{\Psi }} = {45^\circ} \end{array}\)

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