Calculate the power output

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Questions 1 - The excitation of a 415-V, 3-phase, mesh-connected synchronous motor is such that the induced e.m.f. is 520 V. The impedance per phase is (0.5 + j4.0) ohm. If the friction and iron losses are constant at 1000 W, calculate the power output, line current, power factor and efficiency for maximum power output.

Question 2 - A 3-phase, 3300-V, Y-connected synchronous motor has an effective resistance and synchronous reactance of 2.0 and 18.0 per phase respectively. If the open-circuit generated e.m.f. is 3800 V between lines, calculate

a) the maximum total mechanical power that the motor can develop and

b) the current and p.f. at the maximum mechanical power.

Reference no: EM132587960

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