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KNOWN NERC EXAM WITH 100%
CORRECT ANSWERS 2026
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 answers 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 Balancing Area A b) A net under-generation in the Interconnection c) A loss of load in Balancing Area A d) A loss of load in the Interconnection correct answers b) A net under-generation in the Interconnection What is the penalty for a Balancing Authority violating the Disturbance Control Standard? a) Must carry additional Contingency Reserve
b) Must develop a correction action plan c) Must re-evaluate and change its Frequency Bias Setting d) Must increase its Regulating Reserve correct answers a) Must carry additional Contingency Reserve Your ACE is a large negative value and system frequency is 59.80 Hz. Your AGC system is pulsing your units down. What should you do? a) Place AGC in flat frequency control b) Place AGC in flat tie line control c) Suspend AGC and investigate d) Do nothing as this is normal correct answers c) Suspend AGC and investigate When two identical generating units are operated in parallel on governor control, and on machine has a 5% droop and the other has a 10% droop, the unit with the greater (10%) governor droop will: a) Respond less to frequency deviations b) Respond more to frequency deviations c) Respond the same to frequency deviations d) Not adjust for frequency changes correct answers a) Respond less to frequency deviations On a radial transmission system a generator has a capacity of 600 MWs. The Droop characteristic is at 5% and the generator is currently loaded at 300 MWs. If frequency suddenly drops to 59.3 Hz, what would be the total generator output?
a) 70 MW under-generating b) 70 MW over-generating c) 35 MW under-generating d) 35 MW over-generating correct answers d) 35 MW over-generating Inadvertent energy accumulation occurs due to a difference in Net Actual Interchange and Net Interchange Schedule over time. This energy accumulation can be paid back unilaterally by adjusting delivery of power: a) During off-peak periods b) During periods corresponding to those in which the inadvertent energy was accumulated c) On weekends d) Unilaterally when economically beneficial correct answers B) During periods corresponding to those in which the inadvertent energy was accumulated You are the Source Balancing Authority for an Arranged Interchange Transaction request. The request has a non-standard ramp rate specified. What action should you take? a) Deny the request b) Approve the request if able to accommodate c) Ignore the request d) Call the Reliability Coordinator for guidance correct answers b) Approve the request if able to accommodate
Who must approve an Interchange Transaction before it becomes Confirmed Interchange? a) Balancing Authority b) Reliability Coordinator c) Transmission Operator d) Interchange Coordinator correct answers a) Balancing Authority A Balancing Authority is scheduled to receive 300 MWs from the north and 400 MWs from the south for hour ending 1300. The north schedule is curtailed starting at 1220 with a 10-minute ramp. What is the Net Interchange for the hour? a) 450 MWh b) 500 MWh c) 550 MWh d) 600 MWh correct answers b) 500 MWh A transaction of 100 MWs is scheduled out of your area at the top of the hour with a 10-minute ramp. You have the following generation available: What combination of generation would need to be used? Generator________MWs_________ Curren MWs________ Ramp Capability 1_____________________100 MW______50 MW________________5 MW/min 2____________________100 MW______40 MW________________3 MW/min 3____________________100 MW______50 MW________________1 MW/min 4____________________100 MW______60 MW________________2 MW/min
b) The underground line will carry more of the load increase c) The load increase will be distributed evenly over the two lines d) The line with the higher impedance will carry more of the load correct answers b) The underground line will carry more of the load increase To be effective, reactive resources should be: a) Centrally located in the system b) Located close to generation c) In areas subject to high voltages d) Located close to load areas correct answers d) Located close to load areas Voltage is high in an area due to off-peak demand. There are several lightly loaded high voltage transmission lines going to radial loads. All capacitor banks are out of service. Generators still have reactive reserves both leading and lagging. What should be done first to lower the voltage? a) De-energize the lightly loaded lines b) Use generators to absorb VARs c) Place capacitor banks in service as needed d) Increase voltage to increase load correct answers b) Use generators to absorb VARs A 50 MVA generator is currently producing 40 MWs and 10 MVARs. What are the dynamic reactive reserves currently on this generator? a) 50
b) 30 c) 0 d) 20 correct answers d) 20 In the diagram below, all three lines have the same impedance. What will be the flow on Line 2 if Line 1 is placed in service after an outage? a) 10 MWs b) 20 MWs c) 30 MWs d) 60 MWs correct answers b) 20 MWs A System Operator is conducting switching operations. When he opens one end of a transmission line, there is an indication of load loss. What should the operator do? a) Continue with the switching operation and investigate when complete b) Suspend the switching operation and verify indications c) Immediately close the breaker back in d) File a report to NERC for loss of firm load correct answers b) Suspend the switching operation and verify indications You have just placed a line in service and the receiving bus end of the line shows zero voltage, but there is indication of current flow. What is your primary concern? a) The low voltage at the bus
b) Switching instruction s to a field operator c) Two Transmission Operators discussing in a System Operating Limit d) A System Operator reporting system conditions to his supervisor correct answers b) Switching instructions to a field operator A Balancing Authority receives an Operating Instruction from its Reliability Coordinator. The Balancing Authority must comply with the Operating Instruction unless: a) It results in separation from the Interconnection b) The Balancing Authority disagrees with it c) Has serious financial implications d) Results in danger correct answers d) Results in danger Which of the following is extremely important in determining system load when performing a next day study: a) Transmission configuration b) Forecasted weather c) Planned generation outages d) Wind input correct answers b) Forecasted weather Given the data on the image below, what would be the result if the load at the Bus B increased 200 MWs? a) Line 1 would exceed its SOL
b) Line 2 would exceed is SOL c) Lines 3 & 4 would both exceed their SOL d) All lines would be within their SOL correct answers b) Line 2 would exceed is SOL Several SCADA alarmas indicate a disturbance in area B. There are four transmission lines connecting area A to area B which have become heavily loaded due to disturbance. One of the lines is above its SOL. Re-dispatching of generation has no effect on line flows. As the operator, which answer best applies to this situation? a) The overloaded line should be opened immediately b) A telemeterin failure is giving false indications c) Shed load in area A d) There is a possible separation or islanding in area B correct answers d) There is a possible separation or islanding in area B A contingency results in the exceedence of an IROL. What could be the result if the IROL is allowed to be exceeded longer than its Tv? a) Loss of power to a local area b) The transmission line could fail c) Protective relays could fail d) Interruption of power to a large part of the BES correct answers d) Interruption of power to a large part of the BES
