NERC TOP System Operations| 74 QUESTIONS| WITH COMPLETE SOLUTIONS

At what torque angle of operation does power typically begin to flow from the generator to the system? A) 90 degrees B) 60 degrees C) 30 degrees D) 10 degrees correct answer: 10 degrees Choose the answer that best describes the operation of a rotor. A) The stationary part of the transmission system. B) A type of superconductor. C) The stationary element of a generator that has its windings connected to the system. D) The excited (energized) field winding that rotates inside the stator to induce current into the stator windings. correct answer: The excited (energized) field winding that rotates inside the stator to induce current into the stator windings. In a system that is more capacitive than inductive, the current sine wave will ______ the voltage sine wave with tends to ___________ voltage. A) lag; raise B) lead; raise C) lead; lower D) lag; lower correct answer: lead; raise Sustained operation with a power angle or torque angle above ______ can lead to system instability. A) 10 degrees B) 90 degrees C) 120 degrees D) 360 degrees correct answer: 90 degrees Which of the following conditions may cause transient instability in the power system? A) When the power angle increases to 90 degrees or more. B) When a disturbance causes momentary power angle excursions greater than 90 degrees. C) When heavy power transfers occur in the system, such as when there is a loss in generation. D) All of the above correct answer: All of the above Which of the following is a method that Reliability Coordinators and Balancing Authorities may use to manage transmission outages?