A synchronous motor is running from an infinite bus of voltage V1 in steady-state, at about 50% of its rated load with a power-angle 1 between Vt and Ef (induced voltage). The load is suddenly decreased to 25%. Ef attains its new steady-state power angle 2 with Vt by initially

falling behind, followed by oscillation about

falling behind and making a complete rotation

advancing and making a complete rotation

falling behind, followed by oscillation about

advancing, followed by oscillation about

A synchronous motor is running from an infinite bus of voltage V1 in s

1.	A synchronous motor is running from an infinite bus of voltage V1 in steady-state, at about 50% of its rated load with a power-angle 1 between Vt and Ef (induced voltage). The load is suddenly decreased to 25%. Ef attains its new steady-state power angle 2 with Vt by initially
A.	falling behind and making a complete rotation
B.	advancing and making a complete rotation
C.	falling behind, followed by oscillation about
D.	advancing, followed by oscillation about
Answer» C. falling behind, followed by oscillation about

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A synchronous motor is running from an infinite bus of voltage V1 in steady-state, at about 50% of its rated load with a power-angle 1 between Vt and Ef (induced voltage). The load is suddenly decreased to 25%. Ef attains its new steady-state power angle 2 with Vt by initially

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