NERC TOP System Operations Questions with Correct Answers Graded A+

NERC TOP System Operations Questions with Correct Answers Graded A+ 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 -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. -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 -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 -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 -Answer All of the above Which of the following is a method that Reliability Coordinators and Balancing Authorities may use to manage transmission outages? A) Coordinate and adhere to voltage schedules to minimize reactive power flow. B) Optimize the use of Load Tap Changer transformers, capacitors, and reactors. C) Verify voltage control equipment are on automatic to supply the required voltage support. D) All of the above -Answer All of the above When a large generator on an Interconnection trips off line, the ____________ of the Interconnection ____________. A) frequency; drops B) transformer temperature; drops C) AVRs; drops D) voltage; increases -Answer frequency; drops A(n) ___________ is the value that satisfies the most limiting of the prescribed operating criteria for a specified system configuration to ensure operation within acceptable reliability criteria. A) System Operating Limit B) Circuit Overload C) System Overload Limit D) Interconnection Reliability Operating Limits -Answer System Operating Limit Generator ratings specify the __________ and ___________ at which they can operate safely. A) temperature; voltage B) torque angle; voltage C) System Operating Limits; Interconnection Operating Limits D) voltage; frequency -Answer voltage; frequency