NERC RC EXAM PREP QUESTIONS AND ANSWERS
When does the Contingency Reserve Restoration Period begin?
A. At the top of the hour after the Reportable Disturbance
B. At the start of the Reportable Disturbance
C. At the end of the Disturbance Recovery Period
D. When all Contingency Reserve has been exhausted - CORRECT ANSWER✅✅C. At the end of the
Disturbance Recovery Period
Which of the following terms is defined as the scan rate values of a Balancing Authority's ACE measured
in MW, which includes the difference between the Balancing Authority's Net Interchange Actual and its
Net Interchange Scheduled, plus its Frequency Bias obligation, plus any known meter error?
A. Automatic Time Error
B. Reporting ACE
C. ACE Control Error
D. Reserve Sharing Group Reporting - CORRECT ANSWER✅✅B. Reporting ACE
Which of the following terms applies to the Western Interconnection only, and the addition of a
component to the ACE equation that modifies the control point for the purpose of continuously paying
back Primary Inadvertent Interchange to correct accumulated time error?
A. Reporting ACE
B. Automatic Time Error Correction
C. Reserve Sharing Group Reporting ACE
D. Regulation Reserve Sharing Group - CORRECT ANSWER✅✅B. Automatic Time Error Correction
You are a Balancing Authority Operator. A neighboring Balancing Authority in the Interconnection
suddenly has a 500 MW generator trip due to a generator ground. What part of the ACE equation, ACE =
(NIA-NIS) - 10B (FA-FS) - IME, allows you and other Balancing Authorities in the Interconnection to help
stabilize the Interconnection frequency error?
,A. (FA- FS) - IME
B. NIA - NIS
C. 10B (FA-FS)
D. 4 IME - CORRECT ANSWER✅✅C. 10B (FA-FS)
Balancing Authority A is scheduled to import a net 200 MW and is actually importing a net 150 MW. The
Bias Setting is -100 MW/.1 HZ and Actual Frequency is 59.95 Hz. What is Balancing Authority A's ACE
reading?
A. +100 MW
B. -100 MW
C. 0 MW
D. -55 MW - CORRECT ANSWER✅✅C. 0 MW
Which of the following elements is NOT included in the ACE equations frequency component?
A. Actual Frequency (FA)
B. Scheduled Frequency (FS)
C. Frequency Bias Setting (B)
D. Meter Error (IME) - CORRECT ANSWER✅✅D. Meter Error (IME)
A Balancing Authority is slightly undergenerating its Actual System Frequency (FA) is 60.03 Hz. What is
the result of the Balancing Authority's action?
A. The Balancing Authority is helping the Interconnection Frequency.
B. The Balancing Authority is in CPS1 violation.
C. The Balancing Authority is hurting the Interconnection Frequency.
D. The Balancing Authority is in BAAL violation - CORRECT ANSWER✅✅A. The Balancing Authority is
helping the Interconnection Frequency
,Which statement best describes the CPS1 requirement?
A. ACE must follow changes in load and schedule within a bandwidth called L10.
B. The Responsible Entity must operate so its CPS1 is greater than or equal to 100% for the preceding
12-month period.
C. The average ACE for a defined 10-minute period must be within a limit called L10.
D. ACE must start to return to zero one minute after crossing zero. - CORRECT ANSWER✅✅B. The
Responsible Entity must operate so its CPS1 is greater than or equal to 100% for the preceding 12-
month period
A Balancing Authority's CPS1 calculation is computed using its clock-minute average of two values. What
are those two values?
A. Reporting ACE and Frequency Error
B. Actual and Scheduled Net Interchange NIA and NIS.
C. L10 and Reporting ACE
D. Actual and Scheduled Frequency (FA and FS) - CORRECT ANSWER✅✅A. Reporting ACE and
Frequency Error
To conform to CPS requirements, a Balancing Authority must have which of the following?
A. CPS1 greater than or equal to 90% or BAAL greater than or equal to 100%.
B. CPS1 greater than or equal to 100% and ACE does not exceed BAAL more than 15 consecutive
minutes.
C. CPS1 greater than or equal to 100% and ACE does not exceed BAAL more than 30 consecutive
minutes.
D. CPS1 greater than or equal to 90% and ACE does not exceed BAAL more than 30 consecutive minutes.
- CORRECT ANSWER✅✅C. CPS1 greater than or equal to 100% and ACE does not exceed BAAL more
than 30 consecutive minutes.
What should a Balancing Authority set Scheduled Frequency to for a slow Time Error Correction?
, A. 60.02 Hz
B. 59.98 Hz
C. 59.80 Hz
D. 60.20 Hz - CORRECT ANSWER✅✅A. 60.02 Hz
Which of the following is a potential source of Contingency Reserve?
1. Offline generation that takes 10 minutes to start and ramp to full output
2. Online generation at full load
3. Controllable load resources
4. Voltage reductions
A. 3 and 4
B. 2 and 3
C. 1 and 3
D. 1 and 2 - CORRECT ANSWER✅✅C. 1 and 3
In an Interconnection, which of the following is required to be in the metered boundaries of a Balancing
Authority Area?
A. Generation
B. Transmission
C. Load
D. All are required to be within the metered boundaries of a Balancing Authority. - CORRECT
ANSWER✅✅D. All are required to be within the metered boundaries of a Balancing Authority.
The minimum compliance for NERC Disturbance Control Standard (DCS) is ________?
A. 90% of all reportable disturbances
When does the Contingency Reserve Restoration Period begin?
A. At the top of the hour after the Reportable Disturbance
B. At the start of the Reportable Disturbance
C. At the end of the Disturbance Recovery Period
D. When all Contingency Reserve has been exhausted - CORRECT ANSWER✅✅C. At the end of the
Disturbance Recovery Period
Which of the following terms is defined as the scan rate values of a Balancing Authority's ACE measured
in MW, which includes the difference between the Balancing Authority's Net Interchange Actual and its
Net Interchange Scheduled, plus its Frequency Bias obligation, plus any known meter error?
A. Automatic Time Error
B. Reporting ACE
C. ACE Control Error
D. Reserve Sharing Group Reporting - CORRECT ANSWER✅✅B. Reporting ACE
Which of the following terms applies to the Western Interconnection only, and the addition of a
component to the ACE equation that modifies the control point for the purpose of continuously paying
back Primary Inadvertent Interchange to correct accumulated time error?
A. Reporting ACE
B. Automatic Time Error Correction
C. Reserve Sharing Group Reporting ACE
D. Regulation Reserve Sharing Group - CORRECT ANSWER✅✅B. Automatic Time Error Correction
You are a Balancing Authority Operator. A neighboring Balancing Authority in the Interconnection
suddenly has a 500 MW generator trip due to a generator ground. What part of the ACE equation, ACE =
(NIA-NIS) - 10B (FA-FS) - IME, allows you and other Balancing Authorities in the Interconnection to help
stabilize the Interconnection frequency error?
,A. (FA- FS) - IME
B. NIA - NIS
C. 10B (FA-FS)
D. 4 IME - CORRECT ANSWER✅✅C. 10B (FA-FS)
Balancing Authority A is scheduled to import a net 200 MW and is actually importing a net 150 MW. The
Bias Setting is -100 MW/.1 HZ and Actual Frequency is 59.95 Hz. What is Balancing Authority A's ACE
reading?
A. +100 MW
B. -100 MW
C. 0 MW
D. -55 MW - CORRECT ANSWER✅✅C. 0 MW
Which of the following elements is NOT included in the ACE equations frequency component?
A. Actual Frequency (FA)
B. Scheduled Frequency (FS)
C. Frequency Bias Setting (B)
D. Meter Error (IME) - CORRECT ANSWER✅✅D. Meter Error (IME)
A Balancing Authority is slightly undergenerating its Actual System Frequency (FA) is 60.03 Hz. What is
the result of the Balancing Authority's action?
A. The Balancing Authority is helping the Interconnection Frequency.
B. The Balancing Authority is in CPS1 violation.
C. The Balancing Authority is hurting the Interconnection Frequency.
D. The Balancing Authority is in BAAL violation - CORRECT ANSWER✅✅A. The Balancing Authority is
helping the Interconnection Frequency
,Which statement best describes the CPS1 requirement?
A. ACE must follow changes in load and schedule within a bandwidth called L10.
B. The Responsible Entity must operate so its CPS1 is greater than or equal to 100% for the preceding
12-month period.
C. The average ACE for a defined 10-minute period must be within a limit called L10.
D. ACE must start to return to zero one minute after crossing zero. - CORRECT ANSWER✅✅B. The
Responsible Entity must operate so its CPS1 is greater than or equal to 100% for the preceding 12-
month period
A Balancing Authority's CPS1 calculation is computed using its clock-minute average of two values. What
are those two values?
A. Reporting ACE and Frequency Error
B. Actual and Scheduled Net Interchange NIA and NIS.
C. L10 and Reporting ACE
D. Actual and Scheduled Frequency (FA and FS) - CORRECT ANSWER✅✅A. Reporting ACE and
Frequency Error
To conform to CPS requirements, a Balancing Authority must have which of the following?
A. CPS1 greater than or equal to 90% or BAAL greater than or equal to 100%.
B. CPS1 greater than or equal to 100% and ACE does not exceed BAAL more than 15 consecutive
minutes.
C. CPS1 greater than or equal to 100% and ACE does not exceed BAAL more than 30 consecutive
minutes.
D. CPS1 greater than or equal to 90% and ACE does not exceed BAAL more than 30 consecutive minutes.
- CORRECT ANSWER✅✅C. CPS1 greater than or equal to 100% and ACE does not exceed BAAL more
than 30 consecutive minutes.
What should a Balancing Authority set Scheduled Frequency to for a slow Time Error Correction?
, A. 60.02 Hz
B. 59.98 Hz
C. 59.80 Hz
D. 60.20 Hz - CORRECT ANSWER✅✅A. 60.02 Hz
Which of the following is a potential source of Contingency Reserve?
1. Offline generation that takes 10 minutes to start and ramp to full output
2. Online generation at full load
3. Controllable load resources
4. Voltage reductions
A. 3 and 4
B. 2 and 3
C. 1 and 3
D. 1 and 2 - CORRECT ANSWER✅✅C. 1 and 3
In an Interconnection, which of the following is required to be in the metered boundaries of a Balancing
Authority Area?
A. Generation
B. Transmission
C. Load
D. All are required to be within the metered boundaries of a Balancing Authority. - CORRECT
ANSWER✅✅D. All are required to be within the metered boundaries of a Balancing Authority.
The minimum compliance for NERC Disturbance Control Standard (DCS) is ________?
A. 90% of all reportable disturbances
