The phaser diagram of a synchronous machine connected to an infinite bus is shown below. The machine is [Figure description: A phasor diagram with the terminal voltage phasor V drawn as a horizontal arrow pointing right (labelled TERMINAL VOLTAGE), and the induced voltage phasor E drawn from the same origin pointing up and to the right at roughly 45 degrees (labelled INDUCED VOLTAGE), i.e. E leads V by a load angle.]
- A. Generator and operating at lagging pf
- B. Generator and operating at leading pf
- C. Motor and operating at a leading pf
- D. Motor and operating at a lagging pf
Answer: A. Generator and operating at lagging pf
Explanation: The induced voltage E leads terminal voltage V by load angle δ (δ > 0), identifying the machine as a generator. Furthermore, E cos δ > V, which means the machine operates at a lagging power factor.