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NERC System Operator Exam Preparation questions with 100% correct answers
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NERC System Operator Exam Preparation questions with 100% correct answers
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NERC System Operator ExamPreparation
Power equation - correct answer ✔✔P=IV; power (watts)=current (amps) x voltage (volts)
Power equation three phase - correct answer ✔✔Power=Voltage (v) x Current (I) x 1.73 x Power Factor
(PF)
If operating reserve gradually decreases throughout the hour, it's because ___. - correct answer
✔✔Incorrect load forecast
Operating reserves are made up of ___ and ___. - correct answer ✔✔Regulating Reserves and
Contingency Reserve
What type of reserves are used for AGC? - correct answer ✔✔Regulating
A BA's MSSC is usually its ___. - correct answer ✔✔Largest Generator
Equation to determine speed in RPM of a Generator? - correct answer ✔✔7200/# of poles
At what frequency will a generator trip on underfrequency? - correct answer ✔✔57.5 Hz
Why do we have underfrequency tripping? - correct answer ✔✔Protect turbines from damage
Why does frequency drop faster/is harder to correct, when we have a disturbance when we have
increased wind generation? - correct answer ✔✔Less inertia/governor response to correct frequency
Frequency above 60 Hz means ___. - correct answer ✔✔Overgenerating
,Frequency below 60 Hz means ___. - correct answer ✔✔Undergenerating
Frequency decrease is usually caused by ___. - correct answer ✔✔Loss of generation
A 1% drop in frequency results in ___. - correct answer ✔✔2% drop in total load; 3% drop in motor load
Formula for ACE? - correct answer ✔✔NIa-NIs -10B(Fa-Fs)
Governor response is based on its ___ characteristic. - correct answer ✔✔Droop
5% of 60 Hz= - correct answer ✔✔3 Hz; most Governor's have 5% droop characteristic
Droop setting is the % required for a generator to run at ___ capacity. - correct answer ✔✔Full
What is the purpose of a governor deadband? - correct answer ✔✔Minimize wear on equipment
What % for governor deadband? - correct answer ✔✔+/- .036 Hz
An isochrynous generator setting has ___ droop. - correct answer ✔✔0%
When are isochryonous generators used? - correct answer ✔✔one unit, during islanding
Is 10% droop or 5% droop more responsive? - correct answer ✔✔5%
On a classic disturbance chart, what brings frequency from point c to d? - correct answer
✔✔Contingency Reserve
On a classic disturbance chart, what causes a 'step' change? - correct answer ✔✔Fast-start generator
, What's the primary response to frequency drop? - correct answer ✔✔Governor response
Examples of asynchronous generation? - correct answer ✔✔Solar, wind
What happens to load with increased behind-the-meter generation? - correct answer ✔✔Peaks later in
the day; duck curve
MWs flowing into a BA are - or +? - correct answer ✔✔Negative
If you lose a 500 MW generator in your BA, your ACE ___. - correct answer ✔✔Decreases by 500 MW
What part of the ACE equation is always negative? - correct answer ✔✔Frequency Bias
CPS1 says BA has to be ___ for 12 month period, which is evaluated ___. - correct answer ✔✔≥100%,
monthly
BAAL is a long-term measurement of ___. - correct answer ✔✔ACE
BAAL says Reporting ACE can't exceed the BA's BAAL for more than ___ consecutive minutes. - correct
answer ✔✔30
BAL-002 deals with ___ and reportable events. - correct answer ✔✔Disturbance Control Performance
How much Contingency Reserve does a BA have to have? - correct answer ✔✔100% of MSSC
A disturbance ≥___% is reportable. - correct answer ✔✔80% of MSSC
How long does BA have to recover ACE? - correct answer ✔✔15 minutes
How long does BA have to restore its Contingency Reserves? - correct answer ✔✔90 minutes
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