NERC RC LATEST 2026 PRACTICE EXAM QUESTIONS AND
SOLUTIONS RATED A+
✔✔A function of excitation control system: - ✔✔Control the generator's terminal voltage
and reactive output
✔✔What is the initial response to a drop in frequency due to the loss of a 1,000MW
generator? - ✔✔System inertia
✔✔Time error correction is implemented, scheduled system frequency is off-set by
________Hz. - ✔✔.02
✔✔To qualify as spinning reserve, a generator must be: - ✔✔Synchronized to the
system
✔✔What is a typical reason for unit cycling constraints? - ✔✔Thermal Stress
✔✔Math time:
Freq= 60Hz
Speed= 1800RPM Speed= 600RPM
4 pole pairs Pole pairs= ??? - ✔✔12
(120*60)/600RPM= 12
✔✔If system frequency drops but remains above UF relay settings, what's the impact on
system load? - ✔✔Load would also drop
✔✔Of these, which has the least impact on the system's ACE?
Changes in generator MW output
Changes in system load
Changes in the Interconnection frequency
Changes in the generator MVAR output - ✔✔Changes in the generator MVAR output
✔✔NERC performance standards, which one is the best indicator a Balancing Authority
is maintaining the appropriate amount of contingency reserves on the system? -
✔✔DCS (Disturbance Control Standard)
✔✔In order for Transmission Operators to protect their system's voltage levels under
normal and contingency conditions, they must acquire: - ✔✔Sufficient reactive
resources
✔✔If a 230kV line is loaded to its SIL, and a parallel line trips, the 230kV line will display
characteristics of ___________. - ✔✔A shunt reactor
, ✔✔What will opening a reactor bypass do for a line? - ✔✔Opening a reactor bypass on
a line with a reactor will reduce the flow on it.
✔✔A generator is considered a _______ ________ device. - ✔✔dynamic reactive
✔✔Math time:
Series circuit
R= 40ohms XL= 1.13ohms XC=531ohms
What is the total resistance (Z)? - ✔✔Z=√R² + (XC-XL)²
= 531.38
✔✔Where does reactive power provide the greatest benefit? - ✔✔Near the load
✔✔Relay schemes should be designed so that automatic re-closing during __________
conditions should be prevented. - ✔✔Out-of-Step
✔✔System losses that impact voltage are the result of: - ✔✔Current squared times
impedance
✔✔______ is used to notify Transmission Operators and Balancing Authorities of
transmission problems. - ✔✔RCIS
✔✔Reliability Coordinators are to have ________ communication capability with
Transmission Operators, Balancing Authorities and other Reliability Coordinators. -
✔✔Multidirectional
✔✔Reliability Coordinators are allowed to share info related to ____? - ✔✔area
interchange transactions
✔✔The event reporting for NERC must be completed within ______. - ✔✔24hrs
✔✔Interchange transactions through an RC should be made available to _________ in
the interconnections. - ✔✔all RCs
✔✔Notify RC if BA cannot calculate ACE for more than ________. - ✔✔30 min
✔✔Frequency information is gathered from __________ points. - ✔✔selected
✔✔A TO experiencing SOL/IROL has ________ to correct. - ✔✔30 min
✔✔The time for a TO to correct a SOL/IROL. - ✔✔30min
✔✔Time for TO to get unknown operating state to a known operating state. - ✔✔30 min
SOLUTIONS RATED A+
✔✔A function of excitation control system: - ✔✔Control the generator's terminal voltage
and reactive output
✔✔What is the initial response to a drop in frequency due to the loss of a 1,000MW
generator? - ✔✔System inertia
✔✔Time error correction is implemented, scheduled system frequency is off-set by
________Hz. - ✔✔.02
✔✔To qualify as spinning reserve, a generator must be: - ✔✔Synchronized to the
system
✔✔What is a typical reason for unit cycling constraints? - ✔✔Thermal Stress
✔✔Math time:
Freq= 60Hz
Speed= 1800RPM Speed= 600RPM
4 pole pairs Pole pairs= ??? - ✔✔12
(120*60)/600RPM= 12
✔✔If system frequency drops but remains above UF relay settings, what's the impact on
system load? - ✔✔Load would also drop
✔✔Of these, which has the least impact on the system's ACE?
Changes in generator MW output
Changes in system load
Changes in the Interconnection frequency
Changes in the generator MVAR output - ✔✔Changes in the generator MVAR output
✔✔NERC performance standards, which one is the best indicator a Balancing Authority
is maintaining the appropriate amount of contingency reserves on the system? -
✔✔DCS (Disturbance Control Standard)
✔✔In order for Transmission Operators to protect their system's voltage levels under
normal and contingency conditions, they must acquire: - ✔✔Sufficient reactive
resources
✔✔If a 230kV line is loaded to its SIL, and a parallel line trips, the 230kV line will display
characteristics of ___________. - ✔✔A shunt reactor
, ✔✔What will opening a reactor bypass do for a line? - ✔✔Opening a reactor bypass on
a line with a reactor will reduce the flow on it.
✔✔A generator is considered a _______ ________ device. - ✔✔dynamic reactive
✔✔Math time:
Series circuit
R= 40ohms XL= 1.13ohms XC=531ohms
What is the total resistance (Z)? - ✔✔Z=√R² + (XC-XL)²
= 531.38
✔✔Where does reactive power provide the greatest benefit? - ✔✔Near the load
✔✔Relay schemes should be designed so that automatic re-closing during __________
conditions should be prevented. - ✔✔Out-of-Step
✔✔System losses that impact voltage are the result of: - ✔✔Current squared times
impedance
✔✔______ is used to notify Transmission Operators and Balancing Authorities of
transmission problems. - ✔✔RCIS
✔✔Reliability Coordinators are to have ________ communication capability with
Transmission Operators, Balancing Authorities and other Reliability Coordinators. -
✔✔Multidirectional
✔✔Reliability Coordinators are allowed to share info related to ____? - ✔✔area
interchange transactions
✔✔The event reporting for NERC must be completed within ______. - ✔✔24hrs
✔✔Interchange transactions through an RC should be made available to _________ in
the interconnections. - ✔✔all RCs
✔✔Notify RC if BA cannot calculate ACE for more than ________. - ✔✔30 min
✔✔Frequency information is gathered from __________ points. - ✔✔selected
✔✔A TO experiencing SOL/IROL has ________ to correct. - ✔✔30 min
✔✔The time for a TO to correct a SOL/IROL. - ✔✔30min
✔✔Time for TO to get unknown operating state to a known operating state. - ✔✔30 min
