SOS NERC PREP - RELIABILITY EXAM LATEST 2024
ACTUAL EXAM 200 QUESTIONS AND CORRECT DETAILED
ANSWERS (|ALREADY GRADED A+
A Balancing Authority has a 200 MW/0.1 Hz frequency bias with zero schedules.
Frequency is 60.00 Hz and ACE is 0, what should the sum of all the Balancing
Authorities Interconnection ties equal?
A) Small MW amount out of the BA
B) System Load
C) Zero
D) Total Generation - ANSWER-C) Zero
A simple power system is composed of three transmission lines that connect the
generation area to the load area. The three lines are different lengths, but each
line has the same impedance. Each line is initially loaded at 200 MW. The SOL of
each line is 400 MW. If one of the three lines trips, what will be the loading on the
shortest remaining line and will the SOL of either remaining line be violated?
A) 400 MW/Yes
B) 400 MW/No
C) 300 MW/Yes
D) 300 MW/No - ANSWER-D) 300 MW/No
During a lightning storm, a fault on a transmission line results in the transmission
relay operating and locking-out. The transmission line cannot be returned to
service. After running a contingency analysis, the Transmission Operator realizes
that if another transmission line relays, there could be cascading outages into a
, SOS NERC PREP - RELIABILITY EXAM LATEST 2024
ACTUAL EXAM 200 QUESTIONS AND CORRECT DETAILED
ANSWERS (|ALREADY GRADED A+
neighboring system. Which of the following actions is appropriate for the
Transmission Operator?
A) Reduce transmission voltages by 5% to reduce customer demand.
B) Notify others in the Interconnection of the situation via an Interconnection-
wide telecommunications system.
C) Continue operations without notifying anyone but try to reduce system
loading.
D) Prepare a disturbance report and forward it to the Reliability Coordinator. -
ANSWER-B) Notify others in the Interconnection of the situation via an
Interconnection-wide telecommunications system.
A Generator Operator has some vibration problems with a 500MW coal fired
steam generator. As the result of the vibration problems the Generator Operator
has to set the maximum reactive power production for that unit at 25 Megavar
instead of the normal 200 Megavar. Who should the generator operator notify as
the result of this problem?
A) Transmission Operator
B) System Coordinator
C) Department of Energy (DOE)
D) Regional Reliability Organization - ANSWER-A) Transmission Operator
, SOS NERC PREP - RELIABILITY EXAM LATEST 2024
ACTUAL EXAM 200 QUESTIONS AND CORRECT DETAILED
ANSWERS (|ALREADY GRADED A+
A high voltage transmission line was scheduled out for routine maintenance
several weeks in advance. On the scheduled outage date, field personnel call to
inform the system operator that they will be taking the line out of service. Bad
weather the previous day has forced other outages. What should the system
operator do?
A) Wait until peak is over to make a decision
B) Run a power flow study to determine the effects of this line outage
C) Do not allow the outage
D) Allow the outage because it was scheduled in advanced - ANSWER-B) Run a
power flow study to determine the effects of this line outage
Interconnection frequency is 60.20 Hz. Your ACE is a large positive value and your
AGC is pulsing your units down. What should you do?
A) Suspend AGC and investigate.
B) Place AGC in flat tie line control.
C) Leave AGC in operation as your units respond.
D) Place AGC in constant frequency control. - ANSWER-C) Leave AGC in operation
as your units respond.
, SOS NERC PREP - RELIABILITY EXAM LATEST 2024
ACTUAL EXAM 200 QUESTIONS AND CORRECT DETAILED
ANSWERS (|ALREADY GRADED A+
Which of the following is the most common effect of a Geomagnetic Disturbance
on the power system?
A) Increase static electricity
B) Transformer cores becoming saturated
C) Generator output varies
D) Abnormal VAR direction - ANSWER-B) Transformer cores becoming saturated
In a power system, which type of power provides indication of voltage problems,
is critical for support of heavily loaded transmission lines, and is necessary to have
sufficient dynamic reserves in preparation for a contingency?
A) Solar Power
B) Real Power
C) Reactive Power
D) Apparent Power - ANSWER-C) Reactive Power
You are a transmission operator and you have several large generators operating
at full load on the western portion of your transmission system with 34 kV and
230 kV transmission lines connecting the generators to the larger metropolitan
and Industrial areas in the eastern portion of your transmission system. You
realize by SCADA indications that there is a large power angle approaching 88
degrees between some of the sending busses at the generation sites and the
receiving buses around the load areas. You realize that the slightest contingency
ACTUAL EXAM 200 QUESTIONS AND CORRECT DETAILED
ANSWERS (|ALREADY GRADED A+
A Balancing Authority has a 200 MW/0.1 Hz frequency bias with zero schedules.
Frequency is 60.00 Hz and ACE is 0, what should the sum of all the Balancing
Authorities Interconnection ties equal?
A) Small MW amount out of the BA
B) System Load
C) Zero
D) Total Generation - ANSWER-C) Zero
A simple power system is composed of three transmission lines that connect the
generation area to the load area. The three lines are different lengths, but each
line has the same impedance. Each line is initially loaded at 200 MW. The SOL of
each line is 400 MW. If one of the three lines trips, what will be the loading on the
shortest remaining line and will the SOL of either remaining line be violated?
A) 400 MW/Yes
B) 400 MW/No
C) 300 MW/Yes
D) 300 MW/No - ANSWER-D) 300 MW/No
During a lightning storm, a fault on a transmission line results in the transmission
relay operating and locking-out. The transmission line cannot be returned to
service. After running a contingency analysis, the Transmission Operator realizes
that if another transmission line relays, there could be cascading outages into a
, SOS NERC PREP - RELIABILITY EXAM LATEST 2024
ACTUAL EXAM 200 QUESTIONS AND CORRECT DETAILED
ANSWERS (|ALREADY GRADED A+
neighboring system. Which of the following actions is appropriate for the
Transmission Operator?
A) Reduce transmission voltages by 5% to reduce customer demand.
B) Notify others in the Interconnection of the situation via an Interconnection-
wide telecommunications system.
C) Continue operations without notifying anyone but try to reduce system
loading.
D) Prepare a disturbance report and forward it to the Reliability Coordinator. -
ANSWER-B) Notify others in the Interconnection of the situation via an
Interconnection-wide telecommunications system.
A Generator Operator has some vibration problems with a 500MW coal fired
steam generator. As the result of the vibration problems the Generator Operator
has to set the maximum reactive power production for that unit at 25 Megavar
instead of the normal 200 Megavar. Who should the generator operator notify as
the result of this problem?
A) Transmission Operator
B) System Coordinator
C) Department of Energy (DOE)
D) Regional Reliability Organization - ANSWER-A) Transmission Operator
, SOS NERC PREP - RELIABILITY EXAM LATEST 2024
ACTUAL EXAM 200 QUESTIONS AND CORRECT DETAILED
ANSWERS (|ALREADY GRADED A+
A high voltage transmission line was scheduled out for routine maintenance
several weeks in advance. On the scheduled outage date, field personnel call to
inform the system operator that they will be taking the line out of service. Bad
weather the previous day has forced other outages. What should the system
operator do?
A) Wait until peak is over to make a decision
B) Run a power flow study to determine the effects of this line outage
C) Do not allow the outage
D) Allow the outage because it was scheduled in advanced - ANSWER-B) Run a
power flow study to determine the effects of this line outage
Interconnection frequency is 60.20 Hz. Your ACE is a large positive value and your
AGC is pulsing your units down. What should you do?
A) Suspend AGC and investigate.
B) Place AGC in flat tie line control.
C) Leave AGC in operation as your units respond.
D) Place AGC in constant frequency control. - ANSWER-C) Leave AGC in operation
as your units respond.
, SOS NERC PREP - RELIABILITY EXAM LATEST 2024
ACTUAL EXAM 200 QUESTIONS AND CORRECT DETAILED
ANSWERS (|ALREADY GRADED A+
Which of the following is the most common effect of a Geomagnetic Disturbance
on the power system?
A) Increase static electricity
B) Transformer cores becoming saturated
C) Generator output varies
D) Abnormal VAR direction - ANSWER-B) Transformer cores becoming saturated
In a power system, which type of power provides indication of voltage problems,
is critical for support of heavily loaded transmission lines, and is necessary to have
sufficient dynamic reserves in preparation for a contingency?
A) Solar Power
B) Real Power
C) Reactive Power
D) Apparent Power - ANSWER-C) Reactive Power
You are a transmission operator and you have several large generators operating
at full load on the western portion of your transmission system with 34 kV and
230 kV transmission lines connecting the generators to the larger metropolitan
and Industrial areas in the eastern portion of your transmission system. You
realize by SCADA indications that there is a large power angle approaching 88
degrees between some of the sending busses at the generation sites and the
receiving buses around the load areas. You realize that the slightest contingency
