NERC

When current in an AC circuit is doubled, power losses in the circuit will respond in which way? a) half as much b) does not change c) doubles d) four times greater correct answer: d) four times greater What determines the size of insulators used on power lines? a) Current flow on the line b) Voltage level of the line c) Reactance of the line d) Operating Limit of the line correct answer: b) Voltage level of the line Reactive power is needed to support which type of load? ...

A transmission line is operating with a voltage phase angle different of 30 degrees between the sending Vs and the receiving bus Vr. If the receiving end load is suddenly increased, the voltage phase angle difference will be? correct answer: The phase angle will increase. When load is increased phase angle will increase. A load has a power factor of 0.9 lagging. If the load draws 100 MVA, what is the MW draw? correct answer: 90 pf= mw/mva The high side of a delta-wye connection transform...

The Reliability Coordinator just informed you of a slow time error correction which will begin at the top of the next hour. Your EMS system will not let you change your scheduled frequency. Your Frequency Bias Setting is -100 MW/.1Hz. What action should you take? A) Increase Net Interchange Schedule by 20 MWs. B) Inform the Reliability Coordinator that you cannot participate in the time error correction. C) Decrease Net Interchange Schedule by 20 MWs. D) Increase Net Interchange Sche...

1. If a 500 kV transmission line with a surge impedance loading of 800 MW is currently loaded at 1400 MW, which of the following events would most likely occur? a. Generator MVAR output would increase b. All system capacitors would trip off-line c. Generator MVAR output would decrease d. All automatic reactors would connect to the system correct answer: a. Generator MVAR output would increase 2. When system conditions are such that emergency procedures are expected to be implemented, w...

Common standard time period for station battery to handle outage of AC power to chargers correct answer: 8-12 hours Time to restore data exchange redundancy when redundancy testing by RC/TOP/BA deemed unsuccessful correct answer: 2 hours Transition period to backup control facility (fully functioning) correct answer: 2 hours Annual testing of backup control facility must prove to be functional for this long correct answer: 2 hours Every 2 years TO/TOP/DSP must provide how many ho...

A Balancing Authority notices that Operating Reserve has steadily declined throughout the hour. What is the most likely cause? a) Loss of a large generator in the area b) An inaccurate load forecast c) Loss of a major transmission line d) A malfunction of EMS correct answer: b) An inaccurate load forecast Balancing Area A notices that the Interconnection frequency is 59.94 Hz and their ACE is 0. Which of the following could be the cause of this reading? a) A net under-generation in ...

You are an external BA with a frequency bais of 20 MW/.1 Hz that sees a frequency of 60.02 due to a large loss of load in the contingent BA. If your generator governor control systems responded to the frequency deviation approximately how much of a generation change would you BA experience? correct answer: -4MW Net actual interchange minus Net scheduled interchange is what? correct answer: Inadvertent interchange Suppose your interconnection operators at 59.97 Hz from one minute after mi...