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A set of practice questions and solutions for the nerc certification exam. It covers various topics related to the north american electric reliability corporation (nerc) standards and regulations, including the nerc functional model, interconnections, balancing authorities, area control error (ace), and contingency events. Useful for individuals preparing for the nerc system operator certification exam.
Typology: Exams
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True/False
According to the NERC Functional Model, there is no difference between the function and the entity.
A) True
B) False - ANSWER B) False
True/False
Analysis type questions are designed to be the least complex from a human cognitive process.
A) True
B) False - ANSWER B) False
True/False
A Transmission Service Provider is an entity that both owns and operates transmission facilities on the Bulk Electric System.
A) True
B) False - ANSWER B) False
True/False
The NERC Functional Model is designed so that the functions of Generator Owner and Generator Operator can be performed by two different entities.
A) True
B) False - ANSWER A) True
How many forms of identification are required when taking the NERC System Operator Certification exam?
The NERC came into existence as a result of the Electric Power Reliability Act of what year?
How many certification credentials does NERC have examinations for?
All four Interconnections operate at ____ Hz, but are not in synchronization with each other.
A) 59Hz/False
B) 62Hz/True
C) 60HZ/True
D) 60.02Hz/False - ANSWER C) 60Hz
How many High-Voltage Direct Current transmission lines are there in operation between the Western and ERCOT Interconnections?
Match the Interconnection with the approximated size in MWs.
In the early days of the electric power system, why weren't high voltage transmission lines needed to serve the customer demand? - ANSWER Because the generation was built close to the customer load
Of the NERC Regional Entities, how many Regional Entities are in the Eastern Interconnection?
The entity that is responsible for ensuring, in real time, that their area demand and supply are finely balanced is known as a? - ANSWER BA (Balancing Authority)
CPS1 Measures Control Performance by?
A) Comparing how well a Transmission Operator's ACE performs in conjunction with the Frequency Error of the Interconnection
B) Comparing how well a Balancing Area's ACE performs in conjunction with the Frequency Error of the Interconnection
C) Comparing how well a Balancing Authority's' ACE performs in conjunction with the Frequency Error of the Interconnection
D) Comparing how well ACE performs in conjunction with the Frequency Error of the Interconnection - ANSWER B) Comparing how well a Balancing Area's ACE performs in conjunction with the Frequency Error of the Interconnection
In the ACE equation β represents which of the following?
A) Frequency Bias
D) 15 mins - ANSWER D) 15
Each Balancing Area or Reserve Sharing Group must review it's Contingencies on at least a/an __________ basis.
A) Semi Annually
B) Annually
C) Weekly
D) Monthly - ANSWER B) Annually
A BA or RSG has how long to replace its Contingency Reserves?
A) 60 mins
B) 30 mins
C) 90 mins
D) 15 mins - ANSWER C) 90 mins
The reporting threshold for a DCS event is ______ % of the MSSC.
If you have a DCS event and 40 seconds later you have another event and the total amount exceeds your MSSC, how is the compliance calculation handled?
A) They are treated as a single event and reported but not subject to the compliance calculation
B) They are treated as different events and reported but not subject to the compliance calculation
C) They are treated as a single event but not reported and not subject to the compliance calculation
D) They are treated as different events and not reported but subject to the compliance calculation - ANSWER A) They are treated as a single event and reported but not subject to the compliance calculation
If the MSSC for a BA is 800 MW, what is the DCS reporting threshold?
Who can serve as an Interconnection Time Monitor? - ANSWER Only Reliability Coordinators
BAs use ______ to automatically direct the loading of regulating reserves on their system. - ANSWER AGC (Automatic Generation Control)
The MSSC for your BA is 650 MW. Your reporting threshold is > 520 MW. (650 x 80%). What is the percent of recovery for the following situation?
Loss of a 575 MW unit
Pre-disturbance Ace = 150 MW
Post-recovery Ace = 10 MW - ANSWER +150 + (-575) = -
-425 + (x) = 10, x= 435
The MSSC for your BA is 650 MW. Your reporting threshold is >/equal to 520 MW. (650 x 80%) What is the percent of recovery for the following situation?
Loss of a 600 MW unit
Pre-disturbance Ace = 150 MW
Post-recovery Ace = -50MW - ANSWER +150 + (-600) = -
-450 + (x) = -50, x= 400
Units with nameplate ratings of 10 MW or greater should be equipped with governors which have a droop of ______% - ANSWER 5%,
All of the reasons listed below can be a cause of inadvertent accumulation except - ANSWER Market response
Each Balancing Area shall operate its AGC on ______, unless such operation is adverse to system or Interconnection reliability. - ANSWER Tie-Line Frequency Bias
If a BA is unable to calculate ACE for more than _________ it shall notify its RC - ANSWER 30 minutes
As a minimum, the BA must provide its System Operators with real-time values for all of the following except ______ with each adjacent BA. - ANSWER MVAR flows
Your BA has a Net Scheduled Interchange of 500 MW and your Actual Interchange is 750MW. The frequency bias setting for your BA is -45 MW/0.10 Hz. The actual frequency is 60.02 HZ. What is your ACE? what is the formula? - ANSWER 259 MW
ACE= N(IA) - N(IS) - [10(B)[(F(a) - F(s)) - Ime
The data scan rate for the ACE calculation has to occur at least every?
A) 30 seconds
NIa = 350
I ME = 0
NIs = 50
FA = 59.
Bias -250MW/0.1 Hz - ANSWER 250 MW
Control Performance Standard 2(CPS 2) was replaced as a Balancing Authority performance measure by which of the following measures? - ANSWER BAAL (Balancing Authority ACE Limit)
What is not a cause of inadvertent accumulation? - ANSWER Market Response
Each Distribution Provider (DP) shall comply with all operating instructions issued by the _________________, including shedding firm load, unless such actions would violate safety, equipment, regulatory or statutory requirements. - ANSWER Balancing Authority
If a Transmission Operator has an anticipated emergency condition, it shall inform? - ANSWER RC (Reliability Coordinator)
BA (Balancing Authority
TOPs (Transmission Operators
Each Balancing Authority and Transmission Operators shall provide Operating Plans for next-day operations with its - ANSWER RC (Reliability Coordinator)
Transmission Operators shall notify entities identified in their next-day operating of the following: - ANSWER Their role in the plan
Each BA shall have an Operating Plan for the next day that addresses all of the following EXCEPT - ANSWER Transmission Outages
Each Generator Operator shall provide outage information daily to its _____________ for scheduled generator outages planned for the next day.
Each Transmission Operator shall operate so that __________, uncontrolled separation, or cascading outages will not occur as a result of the most severe single contingency. - ANSWER Instability
Each Transmission Operator, Balancing Authority, and Generator Operator shall plan and coordinate scheduled outages of all of the following system voltage regulating equipment, among affected Balancing Authorities and Transmission Operators as required except? - ANSWER Phase Angle Regulating Transformers
Each Transmission Operator shall, when practical, operate to protect against instability, uncontrolled separation, or cascading outages resulting from multiple outages, as specified by its - ANSWER RC (Reliability Coordinator)
Each Reliability Coordinator, Transmission Operator, and Balancing Authority shall monitor what? - ANSWER System Frequency
What two pieces of information must each Reliability Coordinator, Transmission Operator, and Balancing Authority have available to predict the system's near-term load pattern? - ANSWER Weather forecasts and past load patterns
You are in your control center on night shift. You receive an updated weather forecast for the operating day that indicates the weather is forecast to be 5 degrees hotter. What should you do? - ANSWER Review the load forecast to determine if any change in the load forecast is required and if the system is appropriately scheduled
Each Transmission Operator shall acquire ______________ within its area to protect the voltage levels under normal and contingency conditions. - ANSWER sufficient reactive resources
If a generator AVR (Automatic Voltage Regulator) is removed from service, what must the GOP do? - ANSWER Use alternative method to control voltage and reactive output
How soon after removing an AVR from service must a GOP notify the TOP? - ANSWER As soon as practical, but less than 30 mins
The Transmission Operator shall direct corrective action, including ________ necessary to prevent voltage collapse when reactive resources are insufficient. - ANSWER Load reduction (only result to this when resources are insufficient)
Who shall know the status of all transmission reactive power resources, including the status of voltage regulators and power system stabilizers?
A) Balancing Authorities
B) Generator Operator
C) Reliability Coordinator
D) Transmission Operator - ANSWER D) Transmission Operator
The Reliability Coordinator shall have _______ to act and to direct actions to be taken by Transmission Operators, Balancing Authorities, Generator Operators, Transmission Service Providers, Load-Serving Entities, and Purchasing-Selling Entities within its Reliability Coordinator Area to preserve the integrity and reliability of the Bulk Electric System. - ANSWER Clear decision making and authority.
Each Reliability Coordinator shall know the current status of all critical facilities whose failure, degradation or disconnection could result in an - ANSWER SOL (System operating limit)
&
IROL (Interconnection reliability operating limit) violation
Each Reliability Coordinator shall have ______________ communications capabilities with its Transmission Operators and Balancing Authorities, and with neighboring Reliability Coordinators. - ANSWER Interpersonal
If a Reliability Coordinator notices an operational concern in another Reliability Coordinators region it should do which of the following? - ANSWER Notify the other Reliability Coordinator
If the results of these studies indicate potential SOL or IROL violations, the Reliability Coordinator shall issue the appropriate alerts via the - ANSWER RCIS (Reliability Coordinator Information System)
**RC's use this to share operating information in real time.
In instances where there is a difference in derived limits, the Reliability Coordinator and its Transmission Operators, Balancing Authorities, Generator Operators, Transmission Service Providers, Load-Serving Entities, and Purchasing-Selling Entities shall always operate the Bulk Electric System to the - ANSWER Most limiting parameter
Regardless of the process it uses, the Reliability Coordinator must direct its Balancing Authorities and Transmission Operators to return the transmission system to within its Interconnection Reliability Operating Limits as soon as possible, but no longer than - ANSWER 30 mins
Each Reliability Coordinator shall, in conjunction with its Transmission Operators and Balancing Authorities shall do which of the following to return transmission loading to within acceptable SOLs or IROLs? - ANSWER operate at limiting parameter
Each Reliability Coordinator shall monitor _________ and its Balancing Authorities' performance and direct any necessary rebalancing to return to CPS and DCS compliance. - ANSWER System frequency
A _________experiencing a reportable incident as detailed by the NERC or DOE reporting procedures shall provide a preliminary written report to its Regional Reliability Organization and NERC/DOE.
A) Generator Operator
B) Load Serving Entity
C) Reliability Coordinator
D) All of the above - ANSWER D) All of the above
Each Reliability Coordinator shall be aware of the restoration plan of each Transmission Operator in its Reliability Coordinator Area in accordance with ____________requirements. - ANSWER NERC and Regional
Each Reliability Coordinator, Balancing Authority, and Transmission Operator, shall review and approve its Operating Plan for backup functionality on what interval? - ANSWER Annually
The plan for the Loss of Control Center Functionality shall include procedures and responsibilities for compliance with - ANSWER Reliability Standards
What is the time limit for the transition period between loss of primary control center functionality and time to fully implement backup functionality?
A) Three hours
B) Two hours
C) Five hours
D) One hours - ANSWER B) Two hours
During an EEA 1, which of the following best describes what the deficient entity is attempting to do? - ANSWER Increase its generation supply.
Why should a Balancing Authority not unilaterally adjust generation in an attempt to return Interconnection frequency to normal beyond that supplied through frequency bias action and Interchange Schedule changes? - ANSWER Such unilateral adjustment may overload transmission facilities.
Each Transmission Operator and Balancing Authority shall develop, maintain, and implement a set of plans to mitigate operating emergencies for which of the following?
A) For insufficient generating capacity
B) For transmission emergencies
C) For load shedding
D) For all of the above - ANSWER D) For all of the above
Who can declare an Energy Emergency Alert? - ANSWER The deficient Balancing Authority's Reliability Coordinator
At a minimum Balancing Authorities shall have operating agreements with _____________ that shall, contain provisions for emergency assistance, including provisions to obtain emergency assistance from - ANSWER Adjacent Balancing Authorities
&
Remote Balancing Authorities
If an interchange transaction started the hour at 100 MW and at 30 minutes past the hour it is reduced to 50 MW, what is the hourly integration for the hour? - ANSWER 75 MWhr