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Q5. A. Differentiate between series and parallel resonances. Draw impedance characteristics of these circuits. B. A 2,000-K VA, 3-phase, 8-pole alternator runs at 750 r.p.m in parallel with other machines on 6,000 V bus-bars. Find synchronizing power on full-load 0.8 p.f. lagging per mechanical degree of displacement and the corresponding synchronizing torque. The synchronous reactance is 6 ohms per phase.