NERC Exam Assessment BEST STUDYING
MATERIAL WITH VERIFIED ANSWERS
LATEST VERSION UPDATE 2024-2025
WITH 150 QUESTIONS
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
- ANSWERS-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
- ANSWERS-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
,- ANSWERS-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
- ANSWERS-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
- ANSWERS-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
,- ANSWERS-B. 40 MVAR
A transmission line has a net VAR load of 25 MVAR into the line resembles which of these
statements?
A. The line is equivalent to an inductor
B. The line is transferring the optimum load
C. The line is nearing voltage collapse
D. The line is equivalent to a capacitor
- ANSWERS-A. The line is equivalent to an inductor
Which statement describes a transmission line loaded above its surge impedance loading?
A. The line becomes more inductive and voltage drops
B. The line becomes less inductive and voltage drops
C. The line becomes more inductive and voltage increases
D. The line becomes less inductive and voltage increases
- ANSWERS-A. The line becomes more inductive and voltage drops
What is power transfer distribution factor PTDF?
A. Post contingency results and configuration of a system under study
B. A measure of the responsiveness or change in electrical loading used for pre-contingency
analysis
C. Congestion management solutions to the most severe single contingency
D. Outage results that measure the electrical loading of transmission area based on system
loading in generation
- ANSWERS-B. A measure of the responsiveness or change in electrical loading used for pre-
contingency analysis
What is generation shift factor GSF?
, A. Used to determine the amount of flow contribution a change in generation output will
impose on a transmission facility
B. Applied to external balancing authorities to know how much of their generation is flowing
into your system
C. Used to determine unit commitment and dispatch
D. Generation that automatically shifts based on load factors
- ANSWERS-A. Used to determine the amount of flow contribution a change in generation
output will impose on a transmission facility
In a power system which type of power is especially critical to support heavily loaded
transmission lines and to have dynamic reserves in preparation for contingency?
A. Reactive power
B. Real power
C. Power flow
D. Apparent power
- ANSWERS-A. Reactive power
Which protection scheme would operate on a difference of current flowing into and out of a
zone of protection?
A. Distance relay
B. Differential relay
C. Overcurrent relay
D. Gas pressure relay
- ANSWERS-B. Differential relay
What is a state estimator primarily used for?
A. Energy management system
B. Contingency analysis
C. Calculate ACE
MATERIAL WITH VERIFIED ANSWERS
LATEST VERSION UPDATE 2024-2025
WITH 150 QUESTIONS
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
- ANSWERS-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
- ANSWERS-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
,- ANSWERS-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
- ANSWERS-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
- ANSWERS-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
,- ANSWERS-B. 40 MVAR
A transmission line has a net VAR load of 25 MVAR into the line resembles which of these
statements?
A. The line is equivalent to an inductor
B. The line is transferring the optimum load
C. The line is nearing voltage collapse
D. The line is equivalent to a capacitor
- ANSWERS-A. The line is equivalent to an inductor
Which statement describes a transmission line loaded above its surge impedance loading?
A. The line becomes more inductive and voltage drops
B. The line becomes less inductive and voltage drops
C. The line becomes more inductive and voltage increases
D. The line becomes less inductive and voltage increases
- ANSWERS-A. The line becomes more inductive and voltage drops
What is power transfer distribution factor PTDF?
A. Post contingency results and configuration of a system under study
B. A measure of the responsiveness or change in electrical loading used for pre-contingency
analysis
C. Congestion management solutions to the most severe single contingency
D. Outage results that measure the electrical loading of transmission area based on system
loading in generation
- ANSWERS-B. A measure of the responsiveness or change in electrical loading used for pre-
contingency analysis
What is generation shift factor GSF?
, A. Used to determine the amount of flow contribution a change in generation output will
impose on a transmission facility
B. Applied to external balancing authorities to know how much of their generation is flowing
into your system
C. Used to determine unit commitment and dispatch
D. Generation that automatically shifts based on load factors
- ANSWERS-A. Used to determine the amount of flow contribution a change in generation
output will impose on a transmission facility
In a power system which type of power is especially critical to support heavily loaded
transmission lines and to have dynamic reserves in preparation for contingency?
A. Reactive power
B. Real power
C. Power flow
D. Apparent power
- ANSWERS-A. Reactive power
Which protection scheme would operate on a difference of current flowing into and out of a
zone of protection?
A. Distance relay
B. Differential relay
C. Overcurrent relay
D. Gas pressure relay
- ANSWERS-B. Differential relay
What is a state estimator primarily used for?
A. Energy management system
B. Contingency analysis
C. Calculate ACE
