Additional NERC Test Questions Resource
and Demand Balancing UPDATED
ACTUAL Exam Questions and CORRECT
Answers
Q1: A Balancing Authority has a Net Interchange Schedule of 150 MW, and a frequency bias of
100 MW/0.1 Hz. Its Net Interchange Actual. Interconnection frequency is 59.95 Hz. Calculate
the Balancing Authorities ACE.
A) 50 MW
B) 40 MW
C) -10 MW
D) 0 MW - CORRECT ANSWER - C) -10 MW
Q2: Bias = -50 MW/0.1 Hz. NIa = 400 MW. NIs = 300 MW. Fa = 59.99 Hz. What is the
Balancing Authority's ACE value?
A) 0 MW
B) 50 MW
C) 95 MW
D) 105 MW - CORRECT ANSWER - C) 95 MW
Q3: You are doing a perfect job of maintaining a load-resource balance. Suddenly, a large
generator in another balancing area trips off-line and frequency drops to 59.9 Hz. Your
frequency Bias is set correctly at -50 MW/0.1 Hz. Your ACE should be:
A) 50 MW
B) 0 MW
C) -50 MW
D) -25 MW - CORRECT ANSWER - B) 0 MW
, Q4: Balancing Area Z notices that the Interconnection frequency is 59.94 Hz. The System
operator in BA Z also sees their ACE is 0. Which of the following could be the cause of these
readings?
A) A net under-generation in Balancing Area Z to support Frequency
B) A net over-generation in Balancing Area Z to support Frequency
C) An increase in load in Balancing Area Z
D) A decrease of generation in Balancing Area Z - CORRECT ANSWER - B) A net over-
generation in Balancing Area Z to support Frequency
Q5: Your Balancing Authority ACE has been around 0 while the Interconnection frequency has
been at 59.95 Hz for the entire hour. What was the MWh inadvertent for that hour? The
frequency bias for your system is 50 MW/0.1Hz.
A) 0 MWh
B) 25 MWh out of your system
C) 25 MWh into your system
D) 50 MWh out of your system - CORRECT ANSWER - B) 25 MWh out of your system
Q6: Which of the following ratios will contribute favorably to a Balancing Authorities CPS1
score?
A) A positive ACE when frequency is above schedule
B) A positive ACE when frequency is below schedule
C) A negative ACE when frequency is below schedule
D) A negative ACE when frequency is at schedule - CORRECT ANSWER - B) A positive
ACE when frequency is below schedule
Q7: According to the BAAL requirement of BAL-001, which of the following statements is true
when actual frequency is greater than Scheduled Frequency?
A) BAALlow does not apply
B) No BAAL limit s apply
C) BAALlow and BAALhigh always apply
D) BAALhigh does not apply - CORRECT ANSWER - A) BAALlow does not apply
and Demand Balancing UPDATED
ACTUAL Exam Questions and CORRECT
Answers
Q1: A Balancing Authority has a Net Interchange Schedule of 150 MW, and a frequency bias of
100 MW/0.1 Hz. Its Net Interchange Actual. Interconnection frequency is 59.95 Hz. Calculate
the Balancing Authorities ACE.
A) 50 MW
B) 40 MW
C) -10 MW
D) 0 MW - CORRECT ANSWER - C) -10 MW
Q2: Bias = -50 MW/0.1 Hz. NIa = 400 MW. NIs = 300 MW. Fa = 59.99 Hz. What is the
Balancing Authority's ACE value?
A) 0 MW
B) 50 MW
C) 95 MW
D) 105 MW - CORRECT ANSWER - C) 95 MW
Q3: You are doing a perfect job of maintaining a load-resource balance. Suddenly, a large
generator in another balancing area trips off-line and frequency drops to 59.9 Hz. Your
frequency Bias is set correctly at -50 MW/0.1 Hz. Your ACE should be:
A) 50 MW
B) 0 MW
C) -50 MW
D) -25 MW - CORRECT ANSWER - B) 0 MW
, Q4: Balancing Area Z notices that the Interconnection frequency is 59.94 Hz. The System
operator in BA Z also sees their ACE is 0. Which of the following could be the cause of these
readings?
A) A net under-generation in Balancing Area Z to support Frequency
B) A net over-generation in Balancing Area Z to support Frequency
C) An increase in load in Balancing Area Z
D) A decrease of generation in Balancing Area Z - CORRECT ANSWER - B) A net over-
generation in Balancing Area Z to support Frequency
Q5: Your Balancing Authority ACE has been around 0 while the Interconnection frequency has
been at 59.95 Hz for the entire hour. What was the MWh inadvertent for that hour? The
frequency bias for your system is 50 MW/0.1Hz.
A) 0 MWh
B) 25 MWh out of your system
C) 25 MWh into your system
D) 50 MWh out of your system - CORRECT ANSWER - B) 25 MWh out of your system
Q6: Which of the following ratios will contribute favorably to a Balancing Authorities CPS1
score?
A) A positive ACE when frequency is above schedule
B) A positive ACE when frequency is below schedule
C) A negative ACE when frequency is below schedule
D) A negative ACE when frequency is at schedule - CORRECT ANSWER - B) A positive
ACE when frequency is below schedule
Q7: According to the BAAL requirement of BAL-001, which of the following statements is true
when actual frequency is greater than Scheduled Frequency?
A) BAALlow does not apply
B) No BAAL limit s apply
C) BAALlow and BAALhigh always apply
D) BAALhigh does not apply - CORRECT ANSWER - A) BAALlow does not apply
