Page |1
RC NERC Questions and Correct Answers/
Latest Update / Already Graded
What is the IEEE number for a Differential Relay?
a. 21
b. 25
c. 50
d. 87
Ans: d. 87
You BA area had two 100 MW interchange transactions at the start of
last hour. Transaction A started at 100 MW and was reduced to 50 MW
on the half-hour. Transaction B started at 100 and was reduced to 50
MW on the half-hour and then reduced to 0 MW at quarter to the hour.
What was the MWhr integration for last hour for your area (Ignore all
ramps)?
a. 62.5 MWhr
b. 125MWhr
c. 137.5 MWhr
d. 200 MWhr
Ans: c. 137.5 MWhr
100*(30min/60)= 50MWhr + 50*(30/60)= 25 Total= 75MWhr
All rights reserved © 2025/ 2026 |
, Page |2
100*(30/60)= 50MWhr 50*(15/60)= 12.5 Total= 62.5+75= 137.5
You are a Transmission Operator and you have changed relay settings
for your Undervoltage Load Shedding Scheme in the Northern part of
your system. Your neighbour just to the North of you has a major
generating facility rated at 1000MW 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 Operators
b. Transmission Service Providers
c. Balancing Authorities
d. Generation Operators
Ans: b. Transmission Service Providers
If you own or operate a UFLS program it must be updated at least how
often?
a. Semi-annually
b. Every 5 years
c. Annually
d. Every 2 years
All rights reserved © 2025/ 2026 |
, Page |3
Ans: c. Annually
You are replacing energy and capacity following the loss of a unit on
your system that is covered by an energy sharing agreement. You have
how long before a tag must be submitted?
a. 20 min
b. 60 min
c. 90 min
d. 15 min
Ans: b. 60 min
You are a Balancing Authority and get a call from your Purchase Selling
Entity that a transaction is to start at the top of the hour and is sinking
on your system. There is no tag in place for this transaction but they
are adamant that it is suppose to start in 5 min. What do you do?
a. Enter the said Transaction into your EMS/AGC system
b. Call the Reliability Coordinator
c. Notify them you have no tag therefore no schedule will be entered
into the EMS
d. Notify your shift manager
All rights reserved © 2025/ 2026 |
, Page |4
Ans: c. Notify them you have no tag therefore no schedule will
be entered into the EMS
You are a Transmission Operator implementing your company's
restoration plan following a system disturbance and subsequent
blackout. You are in the restoration process and have built your system
to have 2,500 MW of synchronized generation and 1600 MW of load
restored. The frequency sudden declines to 58.5 Hz. How would you
return the frequency to 60Hz?
a. Remove 250 MW of generation from service
b. Remove 240 MW of load
c. Increase 50 MW of generation
d. Remove 375 MW of load
Ans: b. Remove 240 MW of load
shed 6-10% of load= ~1Hz
1600*.1= 160MW for 1Hz therefore .5Hz would be 80MW
160+80= 240MW
If you use a Dynamic Schedule that is less than or equal to 250MW,
how much does the average energy profile have to vary by in order to
have to submit a new or modified tag?
a. 10%
All rights reserved © 2025/ 2026 |
RC NERC Questions and Correct Answers/
Latest Update / Already Graded
What is the IEEE number for a Differential Relay?
a. 21
b. 25
c. 50
d. 87
Ans: d. 87
You BA area had two 100 MW interchange transactions at the start of
last hour. Transaction A started at 100 MW and was reduced to 50 MW
on the half-hour. Transaction B started at 100 and was reduced to 50
MW on the half-hour and then reduced to 0 MW at quarter to the hour.
What was the MWhr integration for last hour for your area (Ignore all
ramps)?
a. 62.5 MWhr
b. 125MWhr
c. 137.5 MWhr
d. 200 MWhr
Ans: c. 137.5 MWhr
100*(30min/60)= 50MWhr + 50*(30/60)= 25 Total= 75MWhr
All rights reserved © 2025/ 2026 |
, Page |2
100*(30/60)= 50MWhr 50*(15/60)= 12.5 Total= 62.5+75= 137.5
You are a Transmission Operator and you have changed relay settings
for your Undervoltage Load Shedding Scheme in the Northern part of
your system. Your neighbour just to the North of you has a major
generating facility rated at 1000MW 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 Operators
b. Transmission Service Providers
c. Balancing Authorities
d. Generation Operators
Ans: b. Transmission Service Providers
If you own or operate a UFLS program it must be updated at least how
often?
a. Semi-annually
b. Every 5 years
c. Annually
d. Every 2 years
All rights reserved © 2025/ 2026 |
, Page |3
Ans: c. Annually
You are replacing energy and capacity following the loss of a unit on
your system that is covered by an energy sharing agreement. You have
how long before a tag must be submitted?
a. 20 min
b. 60 min
c. 90 min
d. 15 min
Ans: b. 60 min
You are a Balancing Authority and get a call from your Purchase Selling
Entity that a transaction is to start at the top of the hour and is sinking
on your system. There is no tag in place for this transaction but they
are adamant that it is suppose to start in 5 min. What do you do?
a. Enter the said Transaction into your EMS/AGC system
b. Call the Reliability Coordinator
c. Notify them you have no tag therefore no schedule will be entered
into the EMS
d. Notify your shift manager
All rights reserved © 2025/ 2026 |
, Page |4
Ans: c. Notify them you have no tag therefore no schedule will
be entered into the EMS
You are a Transmission Operator implementing your company's
restoration plan following a system disturbance and subsequent
blackout. You are in the restoration process and have built your system
to have 2,500 MW of synchronized generation and 1600 MW of load
restored. The frequency sudden declines to 58.5 Hz. How would you
return the frequency to 60Hz?
a. Remove 250 MW of generation from service
b. Remove 240 MW of load
c. Increase 50 MW of generation
d. Remove 375 MW of load
Ans: b. Remove 240 MW of load
shed 6-10% of load= ~1Hz
1600*.1= 160MW for 1Hz therefore .5Hz would be 80MW
160+80= 240MW
If you use a Dynamic Schedule that is less than or equal to 250MW,
how much does the average energy profile have to vary by in order to
have to submit a new or modified tag?
a. 10%
All rights reserved © 2025/ 2026 |
