NERC Assessment Test | Actual Questions and Answers Latest
Updated 2026/2027 (Graded A+)
•
The ACE equation must include which metered data in addition to the dynamic schedules, pseudo ties,
actual frequency?
A. Generation
B. Transformers
C. Tie Lines
D. Communications
- ✔✔C. Tie Lines
•
A balancing authority is responsible for load - interchange - generation balance, which calculated value
reflects that balance?
A. Frequency
B. System Lambda
C. Operating reserves
D. ACE
- ✔✔D. ACE
•
If interconnection frequency is 59.95 Hz, how do balancing authorities support interconnection
frequency?
A. Remain at current MW output level
B. Increasing MW output
C. Decreasing MW output
D. Increasing excitation on the field windings
- ✔✔B. Increasing MW output
•
Which control system on the generators would respond to frequency changes?
A. Governor control system
B. Differential relay systems
C. Special protection systems
D. Automatic voltage regulators
- ✔✔A. Governor control system
•
Which of the following is a quick start generator in the best potential source of non-spinning
contingency reserve?
A. Coal plant
B. Combustion turbine
C. Controllable load resources
D. Increases to interchange schedules
- ✔✔B. Combustion turbine
, •
The primary cause of low voltage is:
A. VAR losses associated with heavy power transfers
B. Insufficient generation
C. Insufficient transmission capacity
D. Insufficient shunt reactors in service
- ✔✔A. VAR losses associated with heavy power transfers
•
System inertia is the ability of a power system to:
A. Increase the speed of the rotation of the units resulting in an increase in system frequency
B. Decrease the speed of the rotation of the units resulting in a decrease in system frequency
C. Oppose changes in frequency due to resistance provided by kinetic energy of the rotating masses
D. All of the above
- ✔✔D. All of the above
•
Which of the following are dynamic reactive resources?
1. Synchronous condenser
2. Capacitor bank
3. Reactor bank
4. Generator
•
A. 1 and 3
B. 2 and 3
C. 2 and 4 D. 1 and 4
- ✔✔D. 1 and 4
•
The load on a power transformer is 40 MW and 30 MVAR. What is the transformer's power factor?
A. 0.80
B. 0.70
C. 0.60
D. 0.50
- ✔✔A. 0.80
•
A 50 MVA rated transformer has 30 MW of load. How many MVARs can flow through the transformer
without exceeding the rating?
A. 50 MVAR
B. 40 MVAR
C. 30 MVAR
D. 80 MVAR
- ✔✔B. 40 MVAR
Updated 2026/2027 (Graded A+)
•
The ACE equation must include which metered data in addition to the dynamic schedules, pseudo ties,
actual frequency?
A. Generation
B. Transformers
C. Tie Lines
D. Communications
- ✔✔C. Tie Lines
•
A balancing authority is responsible for load - interchange - generation balance, which calculated value
reflects that balance?
A. Frequency
B. System Lambda
C. Operating reserves
D. ACE
- ✔✔D. ACE
•
If interconnection frequency is 59.95 Hz, how do balancing authorities support interconnection
frequency?
A. Remain at current MW output level
B. Increasing MW output
C. Decreasing MW output
D. Increasing excitation on the field windings
- ✔✔B. Increasing MW output
•
Which control system on the generators would respond to frequency changes?
A. Governor control system
B. Differential relay systems
C. Special protection systems
D. Automatic voltage regulators
- ✔✔A. Governor control system
•
Which of the following is a quick start generator in the best potential source of non-spinning
contingency reserve?
A. Coal plant
B. Combustion turbine
C. Controllable load resources
D. Increases to interchange schedules
- ✔✔B. Combustion turbine
, •
The primary cause of low voltage is:
A. VAR losses associated with heavy power transfers
B. Insufficient generation
C. Insufficient transmission capacity
D. Insufficient shunt reactors in service
- ✔✔A. VAR losses associated with heavy power transfers
•
System inertia is the ability of a power system to:
A. Increase the speed of the rotation of the units resulting in an increase in system frequency
B. Decrease the speed of the rotation of the units resulting in a decrease in system frequency
C. Oppose changes in frequency due to resistance provided by kinetic energy of the rotating masses
D. All of the above
- ✔✔D. All of the above
•
Which of the following are dynamic reactive resources?
1. Synchronous condenser
2. Capacitor bank
3. Reactor bank
4. Generator
•
A. 1 and 3
B. 2 and 3
C. 2 and 4 D. 1 and 4
- ✔✔D. 1 and 4
•
The load on a power transformer is 40 MW and 30 MVAR. What is the transformer's power factor?
A. 0.80
B. 0.70
C. 0.60
D. 0.50
- ✔✔A. 0.80
•
A 50 MVA rated transformer has 30 MW of load. How many MVARs can flow through the transformer
without exceeding the rating?
A. 50 MVAR
B. 40 MVAR
C. 30 MVAR
D. 80 MVAR
- ✔✔B. 40 MVAR
