A 3 phase synchronous motor, connected to aninfinite bus, operating at a leading pf with a constant load torque, if excitation is increased ($$\delta$$ is load angle and $$\phi$$ power factor angle)

A

Both $$\delta$$ and $$\phi$$ decreases

B

$$\delta$$ and $$\phi$$ both increases

C

$$\delta$$ increases but $$\phi$$ decreases

D

$$\delta$$ decreases but $$\phi$$ increases