NERC TOP System Operations Examination
Comprehensive 150-Question Multiple-Choice Test Bank
Advanced / Hard / Mixed Difficulty Level
Target Audience: Transmission Operators, System Operators, and NERC
Certification Candidates
EXAM TITLE: NERC Transmission Operator (TOP) System
Operations Certification Examination – Comprehensive
Assessment of Reliability Standards, Real-Time Operations,
Contingency Analysis, Voltage Control, Emergency Procedures,
and Interconnection Reliability Coordination for Bulk Electric
System Operators
Section 1: TOP Core Responsibilities and Authority (Questions 1-15)
1. According to NERC standards, the primary responsibility of a Transmission Operator (TOP)
is to:
A) Ensure the Balancing Authority maintains ACE within limits
B) Operate the transmission system within IROLs and SOLs
C) Schedule interchange transactions
D) Maintain primary frequency response
Correct Answer: B
Rationale: The TOP's core responsibility is real-time monitoring and control of the transmission
system to ensure reliability within Interconnection Reliability Operating Limits (IROLs) and
System Operating Limits (SOLs).
,2. A Transmission Operator must notify its Reliability Coordinator (RC) within how many
minutes of discovering an SOL or IROL violation?
A) Immediately, but no more than 15 minutes
B) 30 minutes
C) 60 minutes
D) 120 minutes
Correct Answer: B
Rationale: NERC TOP-002-4 requires the TOP to notify the RC within 30 minutes of identifying
a violation of an SOL or IROL, unless corrected within that timeframe.
3. If an IROL is exceeded, the TOP must initiate a remedy within:
A) 15 minutes
B) 30 minutes
C) 45 minutes
D) 60 minutes
Correct Answer: B
Rationale: Per TOP-001-4, if an IROL is exceeded, the TOP must initiate remedial action within
30 minutes.
4. The TOP has the authority to curtail or interrupt firm transmission service when:
A) It is economically beneficial
B) Directed by the Balancing Authority
C) Necessary to maintain system reliability
D) Requested by a neighboring TOP
Correct Answer: C
,Rationale: Per TOP-001-4, reliability trumps commercial arrangements. The TOP may curtail
firm transmission service if needed to prevent an IROL violation.
5. NERC Standard PER-003 requires that Transmission Operators, Balancing Authorities, and
Reliability Coordinators who fill a real-time operating position are __________.
A) Certified
B) On call
C) Trained monthly
D) Tested annually
Correct Answer: A
Rationale: Certification of operating personnel is necessary to ensure competencies for
operating a reliable Bulk Electric System.
6. Which entity is responsible for ensuring that the TOP has current SOLs and IROLs?
A) Balancing Authority
B) Planning Authority
C) Reliability Coordinator
D) Transmission Planner
Correct Answer: B (Planning Authority)
Rationale: The Transmission Planner or Planning Authority develops and provides SOLs/IROLs
to the TOP per NERC standards PRC-023 and TOP-001.
7. TOP-001-4: Transmission Operations has which of the following as its primary purpose?
A) To establish economic dispatch criteria
B) To prevent instability, uncontrolled separation, or cascading outages
C) To maximize transmission revenue
D) To coordinate maintenance schedules
, Correct Answer: B
Rationale: The purpose of TOP-001-4 is to prevent instability, uncontrolled separation, or
Cascading outages that adversely impact the reliability of the Interconnection by ensuring
prompt action to prevent or mitigate such occurrences.
8. Each Transmission Operator shall act to maintain the reliability of its Transmission
Operator Area via:
A) Its own actions only
B) Issuing Operating Instructions only
C) Its own actions or by issuing Operating Instructions
D) Coordinating with the Balancing Authority only
Correct Answer: C
Rationale: TOP-001-4 Requirement R1 states that each Transmission Operator shall act to
maintain the reliability of its Transmission Operator Area via its own actions or by issuing
Operating Instructions.
9. The TOP must ensure that its operating personnel are trained on reliability standards
within:
A) 3 months of hire
B) 6 months of hire
C) 1 year of hire
D) 2 years of hire
Correct Answer: C
Rationale: PER-005-2 requires TOP operators to be NERC-certified and trained annually, with
initial qualification within 1 year.
10. A TOP's failure to notify the RC of an SOL violation is a violation of which standard?
Comprehensive 150-Question Multiple-Choice Test Bank
Advanced / Hard / Mixed Difficulty Level
Target Audience: Transmission Operators, System Operators, and NERC
Certification Candidates
EXAM TITLE: NERC Transmission Operator (TOP) System
Operations Certification Examination – Comprehensive
Assessment of Reliability Standards, Real-Time Operations,
Contingency Analysis, Voltage Control, Emergency Procedures,
and Interconnection Reliability Coordination for Bulk Electric
System Operators
Section 1: TOP Core Responsibilities and Authority (Questions 1-15)
1. According to NERC standards, the primary responsibility of a Transmission Operator (TOP)
is to:
A) Ensure the Balancing Authority maintains ACE within limits
B) Operate the transmission system within IROLs and SOLs
C) Schedule interchange transactions
D) Maintain primary frequency response
Correct Answer: B
Rationale: The TOP's core responsibility is real-time monitoring and control of the transmission
system to ensure reliability within Interconnection Reliability Operating Limits (IROLs) and
System Operating Limits (SOLs).
,2. A Transmission Operator must notify its Reliability Coordinator (RC) within how many
minutes of discovering an SOL or IROL violation?
A) Immediately, but no more than 15 minutes
B) 30 minutes
C) 60 minutes
D) 120 minutes
Correct Answer: B
Rationale: NERC TOP-002-4 requires the TOP to notify the RC within 30 minutes of identifying
a violation of an SOL or IROL, unless corrected within that timeframe.
3. If an IROL is exceeded, the TOP must initiate a remedy within:
A) 15 minutes
B) 30 minutes
C) 45 minutes
D) 60 minutes
Correct Answer: B
Rationale: Per TOP-001-4, if an IROL is exceeded, the TOP must initiate remedial action within
30 minutes.
4. The TOP has the authority to curtail or interrupt firm transmission service when:
A) It is economically beneficial
B) Directed by the Balancing Authority
C) Necessary to maintain system reliability
D) Requested by a neighboring TOP
Correct Answer: C
,Rationale: Per TOP-001-4, reliability trumps commercial arrangements. The TOP may curtail
firm transmission service if needed to prevent an IROL violation.
5. NERC Standard PER-003 requires that Transmission Operators, Balancing Authorities, and
Reliability Coordinators who fill a real-time operating position are __________.
A) Certified
B) On call
C) Trained monthly
D) Tested annually
Correct Answer: A
Rationale: Certification of operating personnel is necessary to ensure competencies for
operating a reliable Bulk Electric System.
6. Which entity is responsible for ensuring that the TOP has current SOLs and IROLs?
A) Balancing Authority
B) Planning Authority
C) Reliability Coordinator
D) Transmission Planner
Correct Answer: B (Planning Authority)
Rationale: The Transmission Planner or Planning Authority develops and provides SOLs/IROLs
to the TOP per NERC standards PRC-023 and TOP-001.
7. TOP-001-4: Transmission Operations has which of the following as its primary purpose?
A) To establish economic dispatch criteria
B) To prevent instability, uncontrolled separation, or cascading outages
C) To maximize transmission revenue
D) To coordinate maintenance schedules
, Correct Answer: B
Rationale: The purpose of TOP-001-4 is to prevent instability, uncontrolled separation, or
Cascading outages that adversely impact the reliability of the Interconnection by ensuring
prompt action to prevent or mitigate such occurrences.
8. Each Transmission Operator shall act to maintain the reliability of its Transmission
Operator Area via:
A) Its own actions only
B) Issuing Operating Instructions only
C) Its own actions or by issuing Operating Instructions
D) Coordinating with the Balancing Authority only
Correct Answer: C
Rationale: TOP-001-4 Requirement R1 states that each Transmission Operator shall act to
maintain the reliability of its Transmission Operator Area via its own actions or by issuing
Operating Instructions.
9. The TOP must ensure that its operating personnel are trained on reliability standards
within:
A) 3 months of hire
B) 6 months of hire
C) 1 year of hire
D) 2 years of hire
Correct Answer: C
Rationale: PER-005-2 requires TOP operators to be NERC-certified and trained annually, with
initial qualification within 1 year.
10. A TOP's failure to notify the RC of an SOL violation is a violation of which standard?
