NERC Exam | Actual Questions and Answers Latest Updated
2026/2027 (Graded A+)
•
Inadvertent interchange
- ✔✔Net actual interchange - Net Scheduled
•
What is the ACE equation? & What does the B Stand for?
- ✔✔Net actual Interchange - Net Scheduled interchange - (10xB) x Actual Freq - Scheduled
Freq B =FRC
•
What is ACE?
- ✔✔Area Control Error, measure of whether generation and load are in balance in a
Balancing Authority
•
What is the typical Frequency Response Characteristic?
- ✔✔3,000 MW/.1HZ
•
What is AGC?
- ✔✔Automatic Generation Control Controls the real power output of the generators in BA to
a balance load and keep ACE at zero
•
What are Generators relationships with Frequency?
- ✔✔Generators increase with declining frequency and decrease with increasing frequency
•
What is the time frame of when you should notify your reliability coordinator if you cant calculate ACE?
- ✔✔30 minutes
•
Can a synchronous machine have a negative torque? What does it mean?
- ✔✔Yes and its absorbing active power
•
A customer load is fed at 120 Volts. The Customer voltage is doubled while the load stays the same.
What is the effect on the power losses?
- ✔✔Decrease the losses by a factor of 4
•
In a typical multi-stage steam turbine, the governor control valves control the steam entry to the ___
- ✔✔High pressure turbine
, •
What are the three categories of switches?
- ✔✔Disconnects, Air breaks and Load Break
•
What are disconnects?
- ✔✔Open and close when there is no current flowing
•
What are sub transmission lines?
- ✔✔Energized lines at voltages below 115 KV
•
KV for transmission Lines
- ✔✔138, 161, 230, 345 and 500
•
Transformer Limit (MVA) for 69 KV
- ✔✔75
•
Transformer Limit (MVA) for 138 KV
- ✔✔150
•
Transformer Limit (MVA) for 345 KV
- ✔✔700
•
What are the 4 types of circuit breakers?
- ✔✔Oil, sf6 gas, vacuum, and air
•
Generators have what type of torque
- ✔✔positive
•
2 ways to measure voltage
- ✔✔Phase to phase and phase to ground
•
For Current flowing into protected equipment it must:
- ✔✔Equal the current flowing out or tis assumed that there is a fault
•
Loss of a 1,000 MW unit results in how much HZ?
- ✔✔.01
2026/2027 (Graded A+)
•
Inadvertent interchange
- ✔✔Net actual interchange - Net Scheduled
•
What is the ACE equation? & What does the B Stand for?
- ✔✔Net actual Interchange - Net Scheduled interchange - (10xB) x Actual Freq - Scheduled
Freq B =FRC
•
What is ACE?
- ✔✔Area Control Error, measure of whether generation and load are in balance in a
Balancing Authority
•
What is the typical Frequency Response Characteristic?
- ✔✔3,000 MW/.1HZ
•
What is AGC?
- ✔✔Automatic Generation Control Controls the real power output of the generators in BA to
a balance load and keep ACE at zero
•
What are Generators relationships with Frequency?
- ✔✔Generators increase with declining frequency and decrease with increasing frequency
•
What is the time frame of when you should notify your reliability coordinator if you cant calculate ACE?
- ✔✔30 minutes
•
Can a synchronous machine have a negative torque? What does it mean?
- ✔✔Yes and its absorbing active power
•
A customer load is fed at 120 Volts. The Customer voltage is doubled while the load stays the same.
What is the effect on the power losses?
- ✔✔Decrease the losses by a factor of 4
•
In a typical multi-stage steam turbine, the governor control valves control the steam entry to the ___
- ✔✔High pressure turbine
, •
What are the three categories of switches?
- ✔✔Disconnects, Air breaks and Load Break
•
What are disconnects?
- ✔✔Open and close when there is no current flowing
•
What are sub transmission lines?
- ✔✔Energized lines at voltages below 115 KV
•
KV for transmission Lines
- ✔✔138, 161, 230, 345 and 500
•
Transformer Limit (MVA) for 69 KV
- ✔✔75
•
Transformer Limit (MVA) for 138 KV
- ✔✔150
•
Transformer Limit (MVA) for 345 KV
- ✔✔700
•
What are the 4 types of circuit breakers?
- ✔✔Oil, sf6 gas, vacuum, and air
•
Generators have what type of torque
- ✔✔positive
•
2 ways to measure voltage
- ✔✔Phase to phase and phase to ground
•
For Current flowing into protected equipment it must:
- ✔✔Equal the current flowing out or tis assumed that there is a fault
•
Loss of a 1,000 MW unit results in how much HZ?
- ✔✔.01
