SOS NERC PREP - RELIABILITY EXAM LATEST 2024-2025
ACTUAL EXAM 200 QUESTIONS AND CORRECT DETAILED
ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED A+
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
Bulk Electric System facilities shall not be removed from service by a System Operator if removing those
facilities would burden neighboring systems unless:
1) the Generator Operator coordinates with the Transmission Operator
2) the Transmission Operator coordinates with the Reliability Coordinator
3) the market is making money
4) The Generator Operator gets permission from its Purchase-Selling Entity
A) 2 and 4
B) 3 and 4
C) 2 and 3
D) 1 and 2 - ANSWER-D) 1 and 2
If a Transmission Operator or Balancing Authority is unable to restore Real and/or Reactive Power
Balance, they must request emergency assistance from the Reliability Coordinator. If Operating reserves
are not available, corrective action need to include:
A) Reduce interchange between systems
B) Implement manual load shedding.
C) Reduce voltage on the distribution system.
D) Notify the RRO. - ANSWER-B) Implement manual load shedding.
,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
Re-synchronization with the Interconnection should only be attempted at a _____________.
A) Substation with a synchroscope
B) Generating plant with an auto-synchronization relay
C) Substation with auto re-closing relays
D) Substation with an auto-synchronization relay - ANSWER-A) Substation with a synchroscope
During on-peak hours, a Transmission Operator suddenly recognizes that a heavily loaded transmission
system has insufficient reactive resources to maintain nominal voltage. It is determined that firm load
shedding will be necessary to avoid a potential voltage collapse on the transmission system. What would
be the proper notification through predetermined communication paths in this circumstance?
A) Its Reliability Coordinator and all other potentially affected Balancing Authorities and Transmission
Operators
B) Its Reliability Coordinator and all other potentially Purchasing Entities.
C) All Balancing Authorities and Transmission Operators in the Interconnection electronically
D) The Shift manager and Regional organization - ANSWER-A) Its Reliability Coordinator and all other
potentially affected Balancing Authorities and Transmission Operators
,A System Operator is in the process of restoring load after a system collapse. The system currently has
three generators online with a combined capacity of 1200 MWs. Current load on the system is 500 MWs.
What is the maximum load that the System Operator can restore at one time without risking the re-
collapse of the system.
A) 25 MWs
B) 80 MWs
C) 35 MWs
D) 60 MWs - ANSWER-D) 60 MWs
A Balancing Area's ACE is -40 MW at 1525 hours when the Balancing Authority loses 800 MW of
generation. Initial governor action arrests frequency decay and shows the BA's ACE is now -852 MW.
At 1542 hours, the BA's ACE is -42 MW and the system frequency is 60.001 Hz. Assuming this event
meets the Disturbance Control Standard (DCS) reporting criteria, what other actions is the BA required to
take?
A) The BA must over generate for the hour to minimize inadvertent
B) The BA recovered more than 80% of its most severe single largest contingency within 15 minutes.
C) No further system operating action is required.
D) The BA must notify the RC that Energy Emergency Alert is required to return ACE to ZERO. -
ANSWER-C) No further system operating action is required.
What is the role of a Reliability Coordinator during system restoration?
A) Direct Balancing to bring on generation
B) Coordination between the Transmission Operators restoration plan
C) Ensure that all breakers are open prior to restoration start
D) Direct control over breaker operations - ANSWER-B) Coordination between the Transmission
Operators restoration plan
Balancing Authority A has a peak load forecast of 5,000 MW at Hour Ending 1500 hour. Net Interchange
Schedules are -1,500 MW (imports) for Hour Ending 0400 through 2200 hour. 500 MW is a Firm Schedule
Total generation on-line is 7,500 MWs. A thunderstorm trips 3,000 MWs of generation at 1215 with a
minimum re-synchronizing time of 3 hours. Generation also trips generation in the sourcing Balancing
Authority which forces the exporting BA to instantly cut a 1,000 MW schedule to this BA to zero.
, A) Notify the RC that this BA is in an EEA Level 2; start all available generation; schedule emergency
interchange purchases; demand-side management
B) Notify the RC that this BA is in EEA Level 3; Notify Balancing Authorities and Transmission Operator
that Load Shed is imminent.
C) Notify the RC that this BA is in EEA Level 1; notify all power plants to be on alert.
D) Notify the RC that this BA is shed 200 MW of load. - ANSWER-A) Notify the RC that this BA is in an
EEA Level 2; start all available generation; schedule emergency interchange purchases; demand-side
management
During system restoration, which of the following could cause problems if not considered?
A) Cold-load pick up.
B) The cost of the generation that is available.
C) The interchange transactions that were in place prior to the system collapse.
D) The ACE reading of your area. - ANSWER-A) Cold-load pick up.
A Balancing Authority that is operating asynchronously (separated from the Interconnection) should
switch its AGC to which mode __________.
A) tie line bias control
B) flat frequency control
C) flat tie-line control
D) manual control - ANSWER-B) flat frequency control
ACTUAL EXAM 200 QUESTIONS AND CORRECT DETAILED
ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED A+
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
Bulk Electric System facilities shall not be removed from service by a System Operator if removing those
facilities would burden neighboring systems unless:
1) the Generator Operator coordinates with the Transmission Operator
2) the Transmission Operator coordinates with the Reliability Coordinator
3) the market is making money
4) The Generator Operator gets permission from its Purchase-Selling Entity
A) 2 and 4
B) 3 and 4
C) 2 and 3
D) 1 and 2 - ANSWER-D) 1 and 2
If a Transmission Operator or Balancing Authority is unable to restore Real and/or Reactive Power
Balance, they must request emergency assistance from the Reliability Coordinator. If Operating reserves
are not available, corrective action need to include:
A) Reduce interchange between systems
B) Implement manual load shedding.
C) Reduce voltage on the distribution system.
D) Notify the RRO. - ANSWER-B) Implement manual load shedding.
,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
Re-synchronization with the Interconnection should only be attempted at a _____________.
A) Substation with a synchroscope
B) Generating plant with an auto-synchronization relay
C) Substation with auto re-closing relays
D) Substation with an auto-synchronization relay - ANSWER-A) Substation with a synchroscope
During on-peak hours, a Transmission Operator suddenly recognizes that a heavily loaded transmission
system has insufficient reactive resources to maintain nominal voltage. It is determined that firm load
shedding will be necessary to avoid a potential voltage collapse on the transmission system. What would
be the proper notification through predetermined communication paths in this circumstance?
A) Its Reliability Coordinator and all other potentially affected Balancing Authorities and Transmission
Operators
B) Its Reliability Coordinator and all other potentially Purchasing Entities.
C) All Balancing Authorities and Transmission Operators in the Interconnection electronically
D) The Shift manager and Regional organization - ANSWER-A) Its Reliability Coordinator and all other
potentially affected Balancing Authorities and Transmission Operators
,A System Operator is in the process of restoring load after a system collapse. The system currently has
three generators online with a combined capacity of 1200 MWs. Current load on the system is 500 MWs.
What is the maximum load that the System Operator can restore at one time without risking the re-
collapse of the system.
A) 25 MWs
B) 80 MWs
C) 35 MWs
D) 60 MWs - ANSWER-D) 60 MWs
A Balancing Area's ACE is -40 MW at 1525 hours when the Balancing Authority loses 800 MW of
generation. Initial governor action arrests frequency decay and shows the BA's ACE is now -852 MW.
At 1542 hours, the BA's ACE is -42 MW and the system frequency is 60.001 Hz. Assuming this event
meets the Disturbance Control Standard (DCS) reporting criteria, what other actions is the BA required to
take?
A) The BA must over generate for the hour to minimize inadvertent
B) The BA recovered more than 80% of its most severe single largest contingency within 15 minutes.
C) No further system operating action is required.
D) The BA must notify the RC that Energy Emergency Alert is required to return ACE to ZERO. -
ANSWER-C) No further system operating action is required.
What is the role of a Reliability Coordinator during system restoration?
A) Direct Balancing to bring on generation
B) Coordination between the Transmission Operators restoration plan
C) Ensure that all breakers are open prior to restoration start
D) Direct control over breaker operations - ANSWER-B) Coordination between the Transmission
Operators restoration plan
Balancing Authority A has a peak load forecast of 5,000 MW at Hour Ending 1500 hour. Net Interchange
Schedules are -1,500 MW (imports) for Hour Ending 0400 through 2200 hour. 500 MW is a Firm Schedule
Total generation on-line is 7,500 MWs. A thunderstorm trips 3,000 MWs of generation at 1215 with a
minimum re-synchronizing time of 3 hours. Generation also trips generation in the sourcing Balancing
Authority which forces the exporting BA to instantly cut a 1,000 MW schedule to this BA to zero.
, A) Notify the RC that this BA is in an EEA Level 2; start all available generation; schedule emergency
interchange purchases; demand-side management
B) Notify the RC that this BA is in EEA Level 3; Notify Balancing Authorities and Transmission Operator
that Load Shed is imminent.
C) Notify the RC that this BA is in EEA Level 1; notify all power plants to be on alert.
D) Notify the RC that this BA is shed 200 MW of load. - ANSWER-A) Notify the RC that this BA is in an
EEA Level 2; start all available generation; schedule emergency interchange purchases; demand-side
management
During system restoration, which of the following could cause problems if not considered?
A) Cold-load pick up.
B) The cost of the generation that is available.
C) The interchange transactions that were in place prior to the system collapse.
D) The ACE reading of your area. - ANSWER-A) Cold-load pick up.
A Balancing Authority that is operating asynchronously (separated from the Interconnection) should
switch its AGC to which mode __________.
A) tie line bias control
B) flat frequency control
C) flat tie-line control
D) manual control - ANSWER-B) flat frequency control
