SOS NERC Prep / RElIABILITY Exam with Questions
and 100% Correct Answers
The Reliability Coordinator just informed you of a slow time error
correction which will begin at the top of the next hour. Your EMS system
will not let you change your scheduled frequency. Your Frequency Bias
Setting is -100 MW/.1Hz. What action should you take?
A) Increase Net Interchange Schedule by 20 MWs.
B) Inform the Reliability Coordinator that you cannot participate in the
time error correction.
C) Decrease Net Interchange Schedule by 20 MWs.
D) Increase Net Interchange Schedule by 10 MWs.
A) Increase Net Interchange Schedule by 20 MWs.
A Balancing Authority has a sudden loss of a large block of load in its
area. This loss will be seen instantaneously in the change of which of the
following values?
1. Actual Net Interchange
2. Scheduled Frequency
3. Scheduled Net Interchange
4. Area Control Error
A) 4 only
B) 1 & 3
C) 1 & 4
D) 3 & 4
C) 1 & 4
Metered Data included in the calculation of ACE are: dynamic schedules,
pseudo ties, actual frequency, and all __________.
A) Tie lines readings
B) Generators output
C) Scheduled frequency indications
D) Transformer load
A) Tie lines readings
, SOS NERC Prep / RElIABILITY Exam with Questions
and 100% Correct Answers
Balancing Authority A is currently reading a system frequency of 60.00 Hz.
Its Net Actual Interchange is +100 MW and its Net Scheduled Interchange is
+200 MW. If Balancing Authority A's frequency bias setting is 100 MW/0.1 Hz,
what is ACE?
A) -100
B) 0
C) 10
D) 100
A) -100
A Balancing Authority has a Net Interchange Schedule of -250 MWs from 1200
to 1600 on a summer day. The Net Interchange Actual for those same hours
respectively were -230 MW, -275 MW, -250 MW and -270 MW. What was the
Balancing Authority's Inadvertent Interchange for the 4-hour period?
A) 6 MWs out
B) 25 MWs in
C) 25 MWs out
D) 6 MWs in
B) 25 MWs in
For the ACE equation to work properly, dynamic schedules, pseudo ties,
frequency, and all ________________ must be metered.
A) Generation
B) Communications
C) Transformers
D) Tie lines
D) Tie lines
If the frequency bias setting is set to a less negative value than the
frequency response of a Balancing Authority and a frequency increase is
caused by a sudden loss of load in an external balancing area, what will be
the result?
, SOS NERC Prep / RElIABILITY Exam with Questions
and 100% Correct Answers
A) The ACE will be zero and will take no AGC action
B) The ACE will be a negative value and AGC will increase generation
C) The ACE will be a positive value and AGC will lower generation
D)This will not affect the ACE
B) The ACE will be a negative value and AGC will increase generation
If the frequency bias setting is less negative than the frequency response
of a Balancing Authority and a frequency decline is caused by a sudden loss
of generation in an external balancing area, what will be the result?
A) The ACE will be a negative value and AGC will increase generation.
B) This will not affect the ACE.
C) The ACE will be a positive value and AGC will lower generation.
D) The ACE will be zero and will take no AGC action.
C) The ACE will be a positive value and AGC will lower generation.
It is the responsibility of which entity/entities to develop, maintain, and
implement load shedding plans?
A) Transmission Operators and Balancing Authorities
B) Reliability Coordinator
C) Load Serving Entities
D) Balancing Authority
A) Transmission Operators and Balancing Authorities
, SOS NERC Prep / RElIABILITY Exam with Questions
and 100% Correct Answers
A Transmission line is loaded 25% above its SOL. A parallel line is out for
routine maintenance and can be placed in service in 10 minutes. What is the
first step the Operator should take to reduce the line loading?
A)Shed load at the downstream bus.
B) Open the line.
C) Re-Dispatch Generation.
D) Initiate the restoration of the parallel line.
D) Initiate the restoration of the parallel line.
As a Transmission Operator, you realize that the voltage level is starting
to decline in the North West part of the system. Which of the following
devices should you, as a Transmission Operator, be able to operate, and/or
have another entity operate to raise the voltage level back to normal in
the North West part of the system?
A) Transformer Underload Tap Changers
B) Shunt Capacitor Banks
C) Generator Reactive Output
D) All answers are correct
D) All answers are correct
Voltage reduction for load relief should be made on the __________.
A) Distribution system
B) Entire Interconnection simultaneously
C) Tie-lines with other Balancing Authority Areas
D) Transmission System
A) Distribution system
Under Frequency Load Shedding (UFLS) is to stabilize the imbalance between
generation and load that has been created by a system disturbance. This is
accomplished by ____________.
and 100% Correct Answers
The Reliability Coordinator just informed you of a slow time error
correction which will begin at the top of the next hour. Your EMS system
will not let you change your scheduled frequency. Your Frequency Bias
Setting is -100 MW/.1Hz. What action should you take?
A) Increase Net Interchange Schedule by 20 MWs.
B) Inform the Reliability Coordinator that you cannot participate in the
time error correction.
C) Decrease Net Interchange Schedule by 20 MWs.
D) Increase Net Interchange Schedule by 10 MWs.
A) Increase Net Interchange Schedule by 20 MWs.
A Balancing Authority has a sudden loss of a large block of load in its
area. This loss will be seen instantaneously in the change of which of the
following values?
1. Actual Net Interchange
2. Scheduled Frequency
3. Scheduled Net Interchange
4. Area Control Error
A) 4 only
B) 1 & 3
C) 1 & 4
D) 3 & 4
C) 1 & 4
Metered Data included in the calculation of ACE are: dynamic schedules,
pseudo ties, actual frequency, and all __________.
A) Tie lines readings
B) Generators output
C) Scheduled frequency indications
D) Transformer load
A) Tie lines readings
, SOS NERC Prep / RElIABILITY Exam with Questions
and 100% Correct Answers
Balancing Authority A is currently reading a system frequency of 60.00 Hz.
Its Net Actual Interchange is +100 MW and its Net Scheduled Interchange is
+200 MW. If Balancing Authority A's frequency bias setting is 100 MW/0.1 Hz,
what is ACE?
A) -100
B) 0
C) 10
D) 100
A) -100
A Balancing Authority has a Net Interchange Schedule of -250 MWs from 1200
to 1600 on a summer day. The Net Interchange Actual for those same hours
respectively were -230 MW, -275 MW, -250 MW and -270 MW. What was the
Balancing Authority's Inadvertent Interchange for the 4-hour period?
A) 6 MWs out
B) 25 MWs in
C) 25 MWs out
D) 6 MWs in
B) 25 MWs in
For the ACE equation to work properly, dynamic schedules, pseudo ties,
frequency, and all ________________ must be metered.
A) Generation
B) Communications
C) Transformers
D) Tie lines
D) Tie lines
If the frequency bias setting is set to a less negative value than the
frequency response of a Balancing Authority and a frequency increase is
caused by a sudden loss of load in an external balancing area, what will be
the result?
, SOS NERC Prep / RElIABILITY Exam with Questions
and 100% Correct Answers
A) The ACE will be zero and will take no AGC action
B) The ACE will be a negative value and AGC will increase generation
C) The ACE will be a positive value and AGC will lower generation
D)This will not affect the ACE
B) The ACE will be a negative value and AGC will increase generation
If the frequency bias setting is less negative than the frequency response
of a Balancing Authority and a frequency decline is caused by a sudden loss
of generation in an external balancing area, what will be the result?
A) The ACE will be a negative value and AGC will increase generation.
B) This will not affect the ACE.
C) The ACE will be a positive value and AGC will lower generation.
D) The ACE will be zero and will take no AGC action.
C) The ACE will be a positive value and AGC will lower generation.
It is the responsibility of which entity/entities to develop, maintain, and
implement load shedding plans?
A) Transmission Operators and Balancing Authorities
B) Reliability Coordinator
C) Load Serving Entities
D) Balancing Authority
A) Transmission Operators and Balancing Authorities
, SOS NERC Prep / RElIABILITY Exam with Questions
and 100% Correct Answers
A Transmission line is loaded 25% above its SOL. A parallel line is out for
routine maintenance and can be placed in service in 10 minutes. What is the
first step the Operator should take to reduce the line loading?
A)Shed load at the downstream bus.
B) Open the line.
C) Re-Dispatch Generation.
D) Initiate the restoration of the parallel line.
D) Initiate the restoration of the parallel line.
As a Transmission Operator, you realize that the voltage level is starting
to decline in the North West part of the system. Which of the following
devices should you, as a Transmission Operator, be able to operate, and/or
have another entity operate to raise the voltage level back to normal in
the North West part of the system?
A) Transformer Underload Tap Changers
B) Shunt Capacitor Banks
C) Generator Reactive Output
D) All answers are correct
D) All answers are correct
Voltage reduction for load relief should be made on the __________.
A) Distribution system
B) Entire Interconnection simultaneously
C) Tie-lines with other Balancing Authority Areas
D) Transmission System
A) Distribution system
Under Frequency Load Shedding (UFLS) is to stabilize the imbalance between
generation and load that has been created by a system disturbance. This is
accomplished by ____________.
