SOS NERC PREP - RELIABILITY EXAM LATEST 2025-2026
ACTUAL EXAM 200 QUESTIONS AND CORRECT DETAILED
ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED A+
✅ Key Features
200 real exam-based questions with verified correct answers.
Detailed rationales/explanations provided for every answer.
Newest 2025–2026 edition, aligned with NERC Reliability Exam updates.
Verified accuracy and A+ graded quality.
Designed for complete exam readiness and confidence.
🎯 Who This Resource Is For
Professionals preparing for the NERC Reliability Exam (2025–2026).
Learners aiming to strengthen NERC exam readiness with full rationales.
Operators, engineers, and industry staff seeking certification success.
Educators and trainers needing a verified exam prep question bank.
You are a Reliability Coordinator experiencing a flow gate that has become overloaded because a
parallel 345 kV line has relayed out causing an SOL violation. What would you do to relieve this
violation?
A) Order the line be placed back in service within 30 minutes.
B) Notify the affected Reliability Coordinator and ask them to resolve this issue
C) Implement the appropriate transmission loading relief procedures
D) Issue a warning to the Transmission Operators that lost the 345 kV line. - answer-C) Implement the
appropriate transmission loading relief procedures
If you are still in an emergency after utilizing your own resources, reserves and readily available
operating reserve including scheduling assistance from others, you should ______________.
A) drop transmission lines
B) put reactor banks in service
C) manually shed load
,D) reduce voltage on the transmission system - answer-C) manually shed load
A Transmission Operator is implementing their system restoration plan after a major system
disturbance. When they are ready to energize a blacked-out area, the system operator must
_________________.
A) Close any capacitor banks which are open
B) Turn all voltage regulators to the manual position
C) Increase blackstart generator to maximum output
D) Isolate the load - answer-D) Isolate the load
A Balancing Authority has a 200 MW/0.1 Hz frequency bias with zero schedules. Frequency is 60.00 Hz
and ACE is 0, what should the sum of all the Balancing Authorities Interconnection ties equal?
Small MW amount out of the BA
A) System Load
B) Zero
C) Total Generation - answer-C) Zero
A simple power system is composed of three transmission lines that connect the generation area to the
load area. The three lines are different lengths, but each line has the same impedance. Each line is
initially loaded at 200 MW. The SOL of each line is 400 MW. If one of the three lines trips, what will be
the loading on the shortest remaining line and will the SOL of either remaining line be violated?
400 MW/Yes
A) 400 MW/No
B) 300 MW/Yes
C) 300 MW/No - answer-D) 300 MW/No
During a lightning storm, a fault on a transmission line results in the transmission relay operating and
locking-out. The transmission line cannot be returned to service. After running a contingency analysis,
the Transmission Operator realizes that if another transmission line relays, there could be cascading
outages into a neighboring system. Which of the following actions is appropriate for the Transmission
Operator?
Reduce transmission voltages by 5% to reduce customer demand.
,A) Notify others in the Interconnection of the situation via an Interconnection-wide telecommunications
system.
B) Continue operations without notifying anyone but try to reduce system loading.
C) Prepare a disturbance report and forward it to the Reliability Coordinator. - answer-B) Notify others
in the Interconnection of the situation via an Interconnection-wide telecommunications system.
A Generator Operator has some vibration problems with a 500MW coal fired steam generator. As the
result of the vibration problems the Generator Operator has to set the maximum reactive power
production for that unit at 25 Megavar instead of the normal 200 Megavar. Who should the generator
operator notify as the result of this problem?
Transmission Operator
A) System Coordinator
B) Department of Energy (DOE)
C) Regional Reliability Organization - answer-A) Transmission Operator
A high voltage transmission line was scheduled out for routine maintenance several weeks in advance.
On the scheduled outage date, field personnel call to inform the system operator that they will be taking
the line out of service. Bad weather the previous day has forced other outages. What should the system
operator do?
Wait until peak is over to make a decision
A) Run a power flow study to determine the effects of this line outage
B) Do not allow the outage
C) Allow the outage because it was scheduled in advanced - answer-B) Run a power flow study to
determine the effects of this line outage
Interconnection frequency is 60.20 Hz. Your ACE is a large positive value and your AGC is pulsing your
units down. What should you do?
Suspend AGC and investigate.
, A) Place AGC in flat tie line control.
B) Leave AGC in operation as your units respond.
C) Place AGC in constant frequency control. - answer-C) Leave AGC in operation as your units respond.
Which of the following is the most common effect of a Geomagnetic Disturbance on the power system?
Increase static electricity
A) Transformer cores becoming saturated
B) Generator output varies
C) Abnormal VAR direction - answer-B) Transformer cores becoming saturated
In a power system, which type of power provides indication of voltage problems, is critical for support of
heavily loaded transmission lines, and is necessary to have sufficient dynamic reserves in preparation for
a contingency?
Solar Power
A) Real Power
B) Reactive Power
C) Apparent Power - answer-C) Reactive Power
You are a transmission operator and you have several large generators operating at full load on the
western portion of your transmission system with 34 kV and 230 kV transmission lines connecting the
generators to the larger metropolitan and Industrial areas in the eastern portion of your transmission
system. You realize by SCADA indications that there is a large power angle approaching 88 degrees
between some of the sending busses at the generation sites and the receiving buses around the load
areas. You realize that the slightest contingency on the system could elevate the power angle above 90
degrees which could cause the generation and load areas to lose synchronism. What would be some of
your first immediate responses to prevent this from happening?
A) Raise the bus voltage at the receiving buses and at the sending buses, if possible. Then, have the
balancing operator provide additional generation on line on th - answer-A) Raise the bus voltage at the
receiving buses and at the sending buses, if possible. Then, have the balancing operator provide
additional generation on line on the eastern portion of the large metropolitan area
A System Operator must operate the transmission system so that instability, uncontrolled separation, or
cascading outages will not occur as a result of _________.
ACTUAL EXAM 200 QUESTIONS AND CORRECT DETAILED
ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED A+
✅ Key Features
200 real exam-based questions with verified correct answers.
Detailed rationales/explanations provided for every answer.
Newest 2025–2026 edition, aligned with NERC Reliability Exam updates.
Verified accuracy and A+ graded quality.
Designed for complete exam readiness and confidence.
🎯 Who This Resource Is For
Professionals preparing for the NERC Reliability Exam (2025–2026).
Learners aiming to strengthen NERC exam readiness with full rationales.
Operators, engineers, and industry staff seeking certification success.
Educators and trainers needing a verified exam prep question bank.
You are a Reliability Coordinator experiencing a flow gate that has become overloaded because a
parallel 345 kV line has relayed out causing an SOL violation. What would you do to relieve this
violation?
A) Order the line be placed back in service within 30 minutes.
B) Notify the affected Reliability Coordinator and ask them to resolve this issue
C) Implement the appropriate transmission loading relief procedures
D) Issue a warning to the Transmission Operators that lost the 345 kV line. - answer-C) Implement the
appropriate transmission loading relief procedures
If you are still in an emergency after utilizing your own resources, reserves and readily available
operating reserve including scheduling assistance from others, you should ______________.
A) drop transmission lines
B) put reactor banks in service
C) manually shed load
,D) reduce voltage on the transmission system - answer-C) manually shed load
A Transmission Operator is implementing their system restoration plan after a major system
disturbance. When they are ready to energize a blacked-out area, the system operator must
_________________.
A) Close any capacitor banks which are open
B) Turn all voltage regulators to the manual position
C) Increase blackstart generator to maximum output
D) Isolate the load - answer-D) Isolate the load
A Balancing Authority has a 200 MW/0.1 Hz frequency bias with zero schedules. Frequency is 60.00 Hz
and ACE is 0, what should the sum of all the Balancing Authorities Interconnection ties equal?
Small MW amount out of the BA
A) System Load
B) Zero
C) Total Generation - answer-C) Zero
A simple power system is composed of three transmission lines that connect the generation area to the
load area. The three lines are different lengths, but each line has the same impedance. Each line is
initially loaded at 200 MW. The SOL of each line is 400 MW. If one of the three lines trips, what will be
the loading on the shortest remaining line and will the SOL of either remaining line be violated?
400 MW/Yes
A) 400 MW/No
B) 300 MW/Yes
C) 300 MW/No - answer-D) 300 MW/No
During a lightning storm, a fault on a transmission line results in the transmission relay operating and
locking-out. The transmission line cannot be returned to service. After running a contingency analysis,
the Transmission Operator realizes that if another transmission line relays, there could be cascading
outages into a neighboring system. Which of the following actions is appropriate for the Transmission
Operator?
Reduce transmission voltages by 5% to reduce customer demand.
,A) Notify others in the Interconnection of the situation via an Interconnection-wide telecommunications
system.
B) Continue operations without notifying anyone but try to reduce system loading.
C) Prepare a disturbance report and forward it to the Reliability Coordinator. - answer-B) Notify others
in the Interconnection of the situation via an Interconnection-wide telecommunications system.
A Generator Operator has some vibration problems with a 500MW coal fired steam generator. As the
result of the vibration problems the Generator Operator has to set the maximum reactive power
production for that unit at 25 Megavar instead of the normal 200 Megavar. Who should the generator
operator notify as the result of this problem?
Transmission Operator
A) System Coordinator
B) Department of Energy (DOE)
C) Regional Reliability Organization - answer-A) Transmission Operator
A high voltage transmission line was scheduled out for routine maintenance several weeks in advance.
On the scheduled outage date, field personnel call to inform the system operator that they will be taking
the line out of service. Bad weather the previous day has forced other outages. What should the system
operator do?
Wait until peak is over to make a decision
A) Run a power flow study to determine the effects of this line outage
B) Do not allow the outage
C) Allow the outage because it was scheduled in advanced - answer-B) Run a power flow study to
determine the effects of this line outage
Interconnection frequency is 60.20 Hz. Your ACE is a large positive value and your AGC is pulsing your
units down. What should you do?
Suspend AGC and investigate.
, A) Place AGC in flat tie line control.
B) Leave AGC in operation as your units respond.
C) Place AGC in constant frequency control. - answer-C) Leave AGC in operation as your units respond.
Which of the following is the most common effect of a Geomagnetic Disturbance on the power system?
Increase static electricity
A) Transformer cores becoming saturated
B) Generator output varies
C) Abnormal VAR direction - answer-B) Transformer cores becoming saturated
In a power system, which type of power provides indication of voltage problems, is critical for support of
heavily loaded transmission lines, and is necessary to have sufficient dynamic reserves in preparation for
a contingency?
Solar Power
A) Real Power
B) Reactive Power
C) Apparent Power - answer-C) Reactive Power
You are a transmission operator and you have several large generators operating at full load on the
western portion of your transmission system with 34 kV and 230 kV transmission lines connecting the
generators to the larger metropolitan and Industrial areas in the eastern portion of your transmission
system. You realize by SCADA indications that there is a large power angle approaching 88 degrees
between some of the sending busses at the generation sites and the receiving buses around the load
areas. You realize that the slightest contingency on the system could elevate the power angle above 90
degrees which could cause the generation and load areas to lose synchronism. What would be some of
your first immediate responses to prevent this from happening?
A) Raise the bus voltage at the receiving buses and at the sending buses, if possible. Then, have the
balancing operator provide additional generation on line on th - answer-A) Raise the bus voltage at the
receiving buses and at the sending buses, if possible. Then, have the balancing operator provide
additional generation on line on the eastern portion of the large metropolitan area
A System Operator must operate the transmission system so that instability, uncontrolled separation, or
cascading outages will not occur as a result of _________.
