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The maximum power in a synchronous motor (for a given excitation) is produced when the power angle is equal to: (A) 0° (B) 45° (C) 60° (D) 90°

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The maximum power in a synchronous motor (for a given excitation) is produced when the power angle is equal to:

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The power produce is maximum when the power angle(torque angle) is 90, because P=VE(a)sin(theta)/X(s).

Where,

P is the power per phase.

V is the phase voltage.

E(a) is the internal generated voltage.

Sin(theta) is the angle between rotor feild and stator feild.

X(s) is the synchronous reactance of the machine.

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