NERC CNP PRACTICE TEST 2025/2026
Questions with 100% Correct Answers
Top Rated A+
Generators have the ability to be used as voltage control
devices. If a generator raises its VAR output the system
operator should expect the system voltage to
A. Decrease
B. Increase
C. Not change
D. Collapse
B. Increase
if a BA has 500 MW of spinning reserves and of that 300 are
regulating reserves, by definition, NERC requires the
regulating reserves must be ____?
A. Online and AGC responsive
B. Able to ramp to full load within 10 minutes
C. Able to be online within 10 minutes
D. Able to be online within 5 minutes
A. Online and AGC responsive
There is a shunt capacitor on your system that has a rating
of 50 MVAR @ 138 KV. The voltage at the time of switching
the capacitor in service is 124 KV. What would be the
expected output of the capacitor?
A. 45 MVAR
B. 43.5 MVAR
C. 50 MVAR
D. 40.5 MVAR
D. 40.5 MVAR
Which mode of AGC operation is the one that NERC states
will be used unless such operation is adverse to the system
or interconnection Reliability?
A. Constant interchange
,B. Tie-line Bias
C. Constant frequency
D. Load-frequency bias
B. Tie-line Bias
You have a 600 MW unit that is currently loaded at 300 MW
and frequency drops .2 Hz. What will the new output of the
generator be as a result of the drop in frequency due to
droop characteristic?
A. 300 MW
B. 340 MW
C. 260 MW
D. 380 MW
B. 340 MW
If a BA is unable to calculate its ACE for more than ____ it
shall notify its RC.
A. 15 minutes
B. 60 minutes
C. 30 minutes
D. 20 minutes
C. 30 minutes
The system frequency is currently 60.03 Hz. The
Synchronized generating capacity is 3200 MW. The system
load is currently 2200 MW. What is the maximum amount of
load block that should be restored?
A. 160 MW
B. 220 MW
C. 110 MW
D. 320 MW
A. 160 MW
A balancing authority has a bias setting of -150 MW. The
frequency falls .05 Hz due to an external disturbance. How
many MW would you expect this balancing authority area to
provide to the disturbance?
A. +150 MW
B. +75 MW
,C. -150 MW
D. -75 MW
B. +75 MW
When a RC must curtail or hold an interchange transaction to
respect transmission service reservation priorities or to
mitigate potential or actual SOL violation, the RC shall inform
the _____ listed on the interchange transaction tag of the
greatest reliable level at which the affected interchange
transaction may flow.
A. Transmission service provider
B. Transmission operator
C. Source balancing authority
D. Sink balancing authority
D. Sink balancing authority
Each generator operator shall provide generator outage
information daily for scheduled generator outages planned
for the next day. Why is this important?
A. So the RC & TOP can do their studies
B. So marketing knows how much gas to buy
C. So the BA knows how much power to buy
D. So the plant can determine staffing requirements
A. So the RC & TOP can do their studies
You are a TOP and you have changed relay settings for your
UVLS scheme in the northern part of your system. Your
neighbor just to the north of you has a major generating
facility rated @ 1000 MW and they supply most of the MVAR
for the area. They also monitor the MVAR flows on most of
the lines in the area due to an NRC requirement regarding
MVAR for a nuclear plant. Of the parties listed below, who
does not need to be notified of the changes made to the relay
settings
A. Transmission service providers
B. Balancing authorities
C. Transmission operators
D. Generation operators
, A. Transmission service providers
Areas of North America with igneous rock formations would
be subject to which of the following due to the igneous rock
formations?
A. Earthquakes
B. High customer load
C. Impacts of GMD activity
D. Earthquake aftershocks
C. Impacts of GMD activity
The data scan rate for the ACE calculation has to occur at
least every ____
A. Four seconds
B. 10 seconds
C. 15 seconds
D. Six seconds
D. Six seconds
According to NERC, which of the following shall shed
customer load rather than risk an uncontrolled failure of
components or cascading outages of the interconnection
after all other remedial steps have been taken?
A. Transmission operator or balancing authority
B. Transmission operator or load serving entity
C. Transmission owner or balancing authority
D. Balancing authority or load serving entity
A. Transmission operator or balancing authority
The transmission owner and distribution provider that owns
a UVLS system shall have equipment maintenance and
testing programs in place. This program shall include which
of the following?
1. Relays
2 instrument transformers
3 grounds
4 batteries
A. 2,3,&4
Questions with 100% Correct Answers
Top Rated A+
Generators have the ability to be used as voltage control
devices. If a generator raises its VAR output the system
operator should expect the system voltage to
A. Decrease
B. Increase
C. Not change
D. Collapse
B. Increase
if a BA has 500 MW of spinning reserves and of that 300 are
regulating reserves, by definition, NERC requires the
regulating reserves must be ____?
A. Online and AGC responsive
B. Able to ramp to full load within 10 minutes
C. Able to be online within 10 minutes
D. Able to be online within 5 minutes
A. Online and AGC responsive
There is a shunt capacitor on your system that has a rating
of 50 MVAR @ 138 KV. The voltage at the time of switching
the capacitor in service is 124 KV. What would be the
expected output of the capacitor?
A. 45 MVAR
B. 43.5 MVAR
C. 50 MVAR
D. 40.5 MVAR
D. 40.5 MVAR
Which mode of AGC operation is the one that NERC states
will be used unless such operation is adverse to the system
or interconnection Reliability?
A. Constant interchange
,B. Tie-line Bias
C. Constant frequency
D. Load-frequency bias
B. Tie-line Bias
You have a 600 MW unit that is currently loaded at 300 MW
and frequency drops .2 Hz. What will the new output of the
generator be as a result of the drop in frequency due to
droop characteristic?
A. 300 MW
B. 340 MW
C. 260 MW
D. 380 MW
B. 340 MW
If a BA is unable to calculate its ACE for more than ____ it
shall notify its RC.
A. 15 minutes
B. 60 minutes
C. 30 minutes
D. 20 minutes
C. 30 minutes
The system frequency is currently 60.03 Hz. The
Synchronized generating capacity is 3200 MW. The system
load is currently 2200 MW. What is the maximum amount of
load block that should be restored?
A. 160 MW
B. 220 MW
C. 110 MW
D. 320 MW
A. 160 MW
A balancing authority has a bias setting of -150 MW. The
frequency falls .05 Hz due to an external disturbance. How
many MW would you expect this balancing authority area to
provide to the disturbance?
A. +150 MW
B. +75 MW
,C. -150 MW
D. -75 MW
B. +75 MW
When a RC must curtail or hold an interchange transaction to
respect transmission service reservation priorities or to
mitigate potential or actual SOL violation, the RC shall inform
the _____ listed on the interchange transaction tag of the
greatest reliable level at which the affected interchange
transaction may flow.
A. Transmission service provider
B. Transmission operator
C. Source balancing authority
D. Sink balancing authority
D. Sink balancing authority
Each generator operator shall provide generator outage
information daily for scheduled generator outages planned
for the next day. Why is this important?
A. So the RC & TOP can do their studies
B. So marketing knows how much gas to buy
C. So the BA knows how much power to buy
D. So the plant can determine staffing requirements
A. So the RC & TOP can do their studies
You are a TOP and you have changed relay settings for your
UVLS scheme in the northern part of your system. Your
neighbor just to the north of you has a major generating
facility rated @ 1000 MW and they supply most of the MVAR
for the area. They also monitor the MVAR flows on most of
the lines in the area due to an NRC requirement regarding
MVAR for a nuclear plant. Of the parties listed below, who
does not need to be notified of the changes made to the relay
settings
A. Transmission service providers
B. Balancing authorities
C. Transmission operators
D. Generation operators
, A. Transmission service providers
Areas of North America with igneous rock formations would
be subject to which of the following due to the igneous rock
formations?
A. Earthquakes
B. High customer load
C. Impacts of GMD activity
D. Earthquake aftershocks
C. Impacts of GMD activity
The data scan rate for the ACE calculation has to occur at
least every ____
A. Four seconds
B. 10 seconds
C. 15 seconds
D. Six seconds
D. Six seconds
According to NERC, which of the following shall shed
customer load rather than risk an uncontrolled failure of
components or cascading outages of the interconnection
after all other remedial steps have been taken?
A. Transmission operator or balancing authority
B. Transmission operator or load serving entity
C. Transmission owner or balancing authority
D. Balancing authority or load serving entity
A. Transmission operator or balancing authority
The transmission owner and distribution provider that owns
a UVLS system shall have equipment maintenance and
testing programs in place. This program shall include which
of the following?
1. Relays
2 instrument transformers
3 grounds
4 batteries
A. 2,3,&4
