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NERC Exam Final Assessment Questions and Correct
Answers Graded A+
When using a dynamic schedule and the energy profile in an hour is >250 MW and the actual hourly integration deviates from the hourly energy profile by ____ the tag must be modified. A. 100 MW B. 10% C. 50 MW D. 25% - Answer✅ B. 10% Dry steam plants, flash steam plants, and binary cycle power plants are the three main types of what kind of generating plant? A. Nuclear generators B. Combustion turbine generators C. Geothermal generators D. Hydroelectric generators - Answer✅ C. Geothermal generators Which type of solar technology converts electromagnetic energy in sunlight directly into direct current? A. Concentrating solar thermal B. Solar DC inverter C. Photovoltaic D. Solar batteries - Answer✅ C. Photovoltaic If a reliability coordinator identifies that there is a potential transmission related problem in the area, who should they notify? A. Marketers in the area B. Other reliability coordinators in the interconnection C. All purchasing selling entities
D. Generation operators in the area of the potential problem - Answer✅ B. Other reliability coordinators in the interconnection Restoration services on critical telecommunications channels should be available _____. A. 24 hours per day B. Within 12 hours of a telecommunication channel failure C. By the end of the next business day D. Within 72 hours of the contingency occurring - Answer✅ A. 24 hours per day According to NERC, A balancing authority may elect to fulfill its contingency reserve obligations by participating as a member of a _____ A. ISO B. Reserve sharing group C. RTO D. Regional reliability organization - Answer✅ B. Reserve sharing group If you were to experience the northern lights what would be your concern with the operation of the power system? A. System harmonics causing oscillations B. A reduction of MVAR consumption C. Generator output reduction D. Transformer overheating - Answer✅ D. Transformer overheating Your BA has a net scheduled interchange of 650 MW and your actual interchange is 800 MW. The frequency bias setting for your BA is 65 MW/0.1 Hz. There is a disturbance on the system and the actual frequency is 60.02 Hz. What is your ACE? A. - 163 MW B. - 137 MW C. 137 MW D. 163 MW - Answer✅ D. 163 MW
Which mode of AGC operation is the one that NERC states will be used unless such operation is adverse to the system or interconnection Reliability? A. Constant interchange B. Tie-line Bias C. Constant frequency D. Load-frequency bias - Answer✅ B. Tie-line Bias You have a 600 MW unit that is currently loaded at 300 MW and frequency drops .2 Hz. What will the new output of the generator be as a result of the drop in frequency due to droop characteristic? A. 300 MW B. 340 MW C. 260 MW D. 380 MW - Answer✅ B. 340 MW If a BA is unable to calculate its ACE for more than ____ it shall notify its RC. A. 15 minutes B. 60 minutes C. 30 minutes D. 20 minutes - Answer✅ C. 30 minutes The system frequency is currently 60.03 Hz. The Synchronized generating capacity is 3200 MW. The system load is currently 2200 MW. What is the maximum amount of load block that should be restored? A. 160 MW B. 220 MW C. 110 MW D. 320 MW - Answer✅ A. 160 MW
A balancing authority has a bias setting of - 150 MW. The frequency falls .05 Hz due to an external disturbance. How many MW would you expect this balancing authority area to provide to the disturbance? A. +150 MW B. +75 MW C. - 150 MW D. - 75 MW - Answer✅ B. +75 MW When a RC must curtail or hold an interchange transaction to respect transmission service reservation priorities or to mitigate potential or actual SOL violation, the RC shall inform the _____ listed on the interchange transaction tag of the greatest reliable level at which the affected interchange transaction may flow. A. Transmission service provider B. Transmission operator C. Source balancing authority D. Sink balancing authority - Answer✅ D. Sink balancing authority Each generator operator shall provide generator outage information daily for scheduled generator outages planned for the next day. Why is this important? A. So the RC & TOP can do their studies B. So marketing knows how much gas to buy C. So the BA knows how much power to buy D. So the plant can determine staffing requirements - Answer✅ A. So the RC & TOP can do their studies You are a TOP and you have changed relay settings for your UVLS scheme in the northern part of your system. Your neighbor just to the north of you has a major generating facility rated @ 1000 MW and they supply most of the MVAR for the area. They also monitor the MVAR flows on most of the lines in the area due to an NRC requirement regarding MVAR for a nuclear plant. Of the parties listed below, who does not need to be notified of the changes made to the relay settings A. Transmission service providers B. Balancing authorities
According to NERC, which of the following shall shed customer load rather than risk an uncontrolled failure of components or cascading outages of the interconnection after all other remedial steps have been taken? A. Transmission operator or balancing authority B. Transmission operator or load serving entity C. Transmission owner or balancing authority D. Balancing authority or load serving entity - Answer✅ A. Transmission operator or balancing authority The transmission owner and distribution provider that owns a UVLS system shall have equipment maintenance and testing programs in place. This program shall include which of the following?
- Relays 2 instrument transformers 3 grounds 4 batteries A. 2,3,& B. 1,3,& C. 1,2,& D. 1,2,&4 - Answer✅ D. 1,2,& Transmission operator A has a step up transformer that has a rating of 1000 MVA at a generating facility. The unit is operating at full load and it is a peak day. Transmission operator A gets an alarm from a step up transformer and sees that it is loaded to 105% of its rated capacity. Transmission operator A has how long to return the transformer to the rated capacity? A. 30 minutes B. 20 minutes C. 60 minutes D. 15 minutes - Answer✅ A. 30 minutes
Who is responsible to know the status of all transmission reactive power resources, including the status of voltage regulators and power system stabilizers? A. Transmission owner B. Transmission operator C. Transmission service provider D. Reliability authority - Answer✅ B. Transmission operator Between the times of 0930 and 0940 the system is operating normally. The average for the ACE is 33 MW. The BA L10 is 29.5 MW. Which of the following NERC performance standards was in violation? A. BAAL B. DCS C. CPS D. CPS2 - Answer✅ D. CPS What is the IEEE number for a differential relay? A. 25 B. 50 C. 21 D. 87 - Answer✅ D. 87 Who is responsible to initiate the confirmation process for interchange schedules? A Balancing Authority B. Generation providing entity C. Transmission service provider D. Purchasing selling entity - Answer✅ A. Balancing authority A 10% reduction in voltage results in the effective value of a capacitor being
A. Shed load at bus B B. Decrease generation at bus A C. Shed load at bus A D. Increase generation at bus B - Answer✅ C. Shed load at bus A If a dynamic transfer value is being used for a pseudo-tie, what term is used when referring to the balancing authority where the generator is physically located? A. Sending BA B. Receiving BA C. Attaining BA D. Native BA - Answer✅ D. Native BA Each transmission operator and balancing authority shall verify the restoration procedure by
A. Actual testing or simulation B. Planning and simulation C. Planning and testing D. Dispatcher input or testing - Answer✅ A. Actual testing or simulation You are a balancing authority and get a call from your purchase selling entity that an interchange transaction is to start at the top of the hour and is sinking on your system. There is no tag in place for this transaction but they are adamant that it is supposed to start in five minutes. What do you do? A. Call the reliability coordinator B. Notify them you have no tag therefore, no schedule will be entered into the EMS C. Enter the said transaction into your EMS/AGC system D. Notify your shift Manager - Answer✅ B. Notify them you have no tag therefore, no schedule will be entered into the EMS Your system has experienced a total shut down. You have worked your system restoration plan and with the help of the RC you now seem to be ready to tie to the interconnection. What are
the three important power system parameters that must be within acceptable limits before re- synchronizing? A. Phase angle, frequency, and voltage B. Phase angle, voltage, and inductive reactance C. Phase angle, frequency, and inductive reactance D. Frequency, voltage, and inductive reactance - Answer✅ A. Phase angle, frequency, and voltage Which of the following types of wind generators have the ability to adjust the pitch of the rotor blades? A. Active stall-controlled wind turbines B. Pitch controlled wind turbines C. Passive stall-controlled wind turbines D. Blade adjustable wind turbines - Answer✅ B. Pitch controlled wind turbines You are a BA and your MSSC is the loss of a 750 MW unit within your reserve sharing group. You have a loss of supply that is a reportable incident and you activate your reserve sharing. You have utilized all of your reserves for the contingency. How long do you have to restore your reserves? A. 90 minutes B. 60 minutes C. 15 minutes D. 30 minutes - Answer✅ A. 90 minutes You are a BA and your frequency bias setting is 450 MW. The actual frequency is 59.98 Hz. What is your contribution to the interconnection for frequency? A. 450 MW B. 900 MW C. 90 MW D. 4500 MW - Answer✅ C. 90 MW
B. 15
C. 90
D. 45 - Answer✅ B. 15 The net scheduled interchange for a BA area is 150 MW out of its system and the actual interchange is 185 MW out. The frequency bias setting is 100 MW/0.1 Hz. The scheduled frequency was at 60 Hz and suddenly declined to 59.95 Hz. Which of the following is true about the balancing authorities ACE and what should the generation do? A. ACE is +35 MW; decrease generation B. ACE is - 15 MW; increase generation C. ACE is - 35 MW; increase generation D. ACE is +15 MW; decrease generation - Answer✅ B. ACE is - 15 MW; increase generation There are two transmission lines that have to be switched into service. Both lines are 500 KV lines and are identical in conductor construction. Line A is 100 miles long, while line B is 75 miles long. Which line will incur more charging when energized? A. Line A B. Line B C. Neither, they will both be the same D. Lying charging is not a concern when switching lines in service - Answer✅ A. Line A An abnormally high voltage situation on a system can be corrected by A. Removing capacitors B. Directing generation to increase their VAR output C. Reducing load D. Decreasing power flow transfers - Answer✅ A. Removing capacitors Each RC, TOP, and BA shall have ____ for when there is a loss of interpersonal communications capability. A. A burst messaging system
B. Alternative communication capability C. Multiple backup phone systems D. Industrial rated satellite phones - Answer✅ B. Alternative communication capability According to NERC standards, RCs, TOPs, BAs, GOPs, and LSEs can submit a report for a sabotage event on which of the following reports? A. Event reporting form or DOE-OE- 407 B. DOE - OE-407 or EEA 3 report C. Event reporting form or DOE-OE- 417 D. Event reporting form or EEA 3 Report - Answer✅ C. Event reporting form or DOE-OE- 417 An indication that a line is loaded above its surge impedance level is that it A. Generates VARs B. Raises voltage C. Absorbs VARs D. Increases capacitance - Answer✅ C. Absorbs VARs If a balancing authority has implemented interchange of 150 MW that started on the hour and was brought to 0 MW at 20 past the hour, what is the hourly integration for the transaction? Ignore all ramp rates A. 50 MWhr B. 100 MWhr C. 25 MWhr D. 150 MWhr - Answer✅ A. 50 MWhr If the MSSC for a BA is a 900 MW gas fired steam unit, what is the DCS reporting threshold? A. 670 MW B. 720 MW C. 180 MW
D. 59.00 - 61.00 Hz - Answer✅ A. 59.75 - 61.00 Hz The reliability coordinator shall verify that all delegated tasks are carried out by NERC certified _____ operating personnel A. Reliability coordinator B. Transmission operator C. Delegated task D. Balancing authority - Answer✅ A. Reliability coordinator The plan for the loss of control center functionality shall include a summary description of the elements required to support the backup functionality which includes all the following except: A. Tools and applications B. Voice communications C. Fully rested relief shifts D. Data communications - Answer✅ C. Fully rested relief shifts Which of the following types of generation resources would utilize a process of fission or fusion? A. Nuclear generators B. Combustion turbine generators C. Geothermal generators D. Hydroelectric generators - Answer✅ A. Nuclear generators Each reliability coordinator shall approve the restoration plan of each transmission operator in its reliability coordinator area in accordance with whose requirements? A. NERC B. DOE C. FERC D. Public utility commission - Answer✅ A. NERC
If balancing authorities ABC's RTU signal for power flow over ABC's Midway tie-line with balancing authority XYZ is significantly in error, the ABC system operator shall A. Not make any adjustments, but after the RTU gets repaired, perform a true-up calculation on the inadvertent account B. Call the XYZ balancing authority and set up an inadvertent interchange schedule that is larger than the RTU error C. Adjust the control settings to compensate for the equipment error until repairs can be made D. Let the AGC system handle the problem - Answer✅ C. Adjust the control settings to compensate for the equipment error until repairs can be made You are operating in the balancing authority function. Your ACE is currently 0 MW and frequency is 59.97 Hz. You determine that your neighboring BA to the north has experienced the tripping of a generator. Between the times of 1020 and 1030 the system is operating normally. The average for the ACE is 58 MW. The BA L10 is 55 MW. What should you do? A. Open the tide lines between you and your neighbor B. Shed load to restore frequency to 60 Hz C. Increase your generation until frequency gets back to 60 Hz D. Control your system ACE and wait for request for assistance - Answer✅ D. Control your system ACE and wait for request for assistance. If a balancing area has a scheduled interchange of 300 MW that started on the hour, what would be the hourly integrated value if the transactions were curtailed at 45 minutes past the hour? A. 150 MWhr B. 225 MWhr C. 100 MWhr D. 300 MWhr - Answer✅ B. 225 MWhr A 900 MW generator has a 5% governor droop characteristic and is connected to the system by two 500 KV lines. Initially it is loaded at 100% of its rated capacity. The frequency then falls 0. Hz. What is the generators new output? A. 75%
C. 1
D. 60 - Answer✅ C. 1 Each reliability coordinator, balancing authority, and transmission operator, shall review and approve its operating plan for back up functionality, how often? A. Weekly B. Monthly C. Never D. Annually - Answer✅ D. Annually The frequency bias setting for a balancing area must be expressed in ______ A. Expressed in MW/0.1 Hz B. Expressed in MW/0.001 Hz C. Expressed in MW/0.01 Hz D. Expressed in MW/1.0 Hz - Answer✅ A. Expressed in MW/0.1 Hz If in the course of operations during emergency conditions it becomes necessary to implement a voltage reduction, where should the voltage reduction take place? A. On the distribution system B. On the transmission facility that has the highest voltage profile C. On only facilities 230 KV and higher D. On all EHV facilities - Answer✅ A. On the distribution system You are working in the RC function and one of the TOP's under your purview has entered into an IROL. According to NERC you do which of the following actions? A. Instruct the TOP to take any action necessary to return the system to within IROL limits ASAP but no longer than 30 minutes B. Issue an EEA1 to all transmission operators under your purview C. Instruct the TOP to shed load immediately and prepare to open the facility
D. Issue an EEA2 to all of the balancing authorities under your purview - Answer✅ A. Instruct the TOP to take any action necessary to return the system to within IROL limits ASAP but no longer than 30 minutes If you are operating your BA area and today's peak load is 5245 MW with a temperature of 88°F what would the expected impact on tomorrow's load if the temperature is forecasted to be 94°F A. Load would be less than 5245 MW B. Load would be more than 5245 MW C. Load would remain the same D. Load would be slightly lower - Answer✅ B. Load would be more than 5245 MW What percentage of a line is protected with overlapping zone one protection? A. 50% B. 80% C. 10% D. 90% - Answer✅ B. 80% In the ACE equation B represents which of the following? A. The percentage of generation available in fast start turbines B. The frequency bias setting (MW/0.1Hz)for the balancing authority C. A percentage of your companies estimated annual peak load D. A percentage of your most severe single contingency - Answer✅ B. The frequency bias setting(MW/0.1 Hz) for the balancing authority You receive indication that all of the circuit breakers on both sides of a transformer have opened and locked out, which of the following relays would you expect to have operated? A. 87B B. 87T C. 59G D. 21- 1 - Answer✅ B. 87T
