Calculate the minimum value of the active power in the cylindrical rotor synchronous machine? (Eb represents armature emf, Vt represents terminal voltage, represents rotor angle, X represents reactance)

Calculate the minimum value of the active power in the cylindrical rot

1.	Calculate the minimum value of the active power in the cylindrical rotor synchronous machine? (Eb represents armature emf, Vt represents terminal voltage, represents rotor angle, X represents reactance)
A.	E<sub>b</sub> V<sub>t</sub> sin X
B.	0
C.	E<sub>b</sub>2 V<sub>t</sub> sin X
D.	E<sub>b</sub> V<sub>t</sub> X
Answer» C. E<sub>b</sub>2 V<sub>t</sub> sin X