The operation of a synchronous motor operating on constant excitation across infinite bus will not be stable if power angle δ?

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1.	The operation of a synchronous motor operating on constant excitation across infinite bus will not be stable if power angle δ?
A.	exceeds internal angle θ
B.	is less than θ
C.	is more than θ/2
D.	is less than θ/2
Answer» B. is less than θ

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