What is the formula for the maximum active power in the cylindrical rotor synchronous machine? (Eb represents armature emf, Vt represents terminal voltage, represents rotor angle, X represents reactance)

What is the formula for the maximum active power in the cylindrical ro

1.	What is the formula for the maximum active power in the cylindrical rotor synchronous machine? (E_b represents armature emf, V_t represents terminal voltage, represents rotor angle, X represents reactance)
A.	E<sub>b</sub> V<sub>t</sub> sin X
B.	E<sub>b</sub> V<sub>t</sub><sup>2</sup> X
C.	E<sub>b</sub><sup>2</sup> V<sub>t</sub> sin X
D.	E<sub>b</sub> V<sub>t</sub> X
Answer» E.