SOS NERC Prep - RELIABILITY EXAM QUESTIONS & ANSWERS
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The Reliability Coordinator just informed you of a slow time error correction which
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will begin at the top of the next hour. Your EMS system will not let you change your
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scheduled frequency. Your FrequencyBias Setting is -100 MW/.1Hz. What action
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should you take?
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A) Increase Net Interchange Schedule by 20 MWs. /73, /73, /73, /73, /73, /73,
B) Informthe Reliability Coordinator thatyou cannot participate in the time error /73, /73, /73, /73, /73, /73, /73, /73, /73, /73, /73,
correction.
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C) Decrease Net Interchange Schedule by20 MWs. /73, /73, /73, /73, /73, /73,
D) Increase Net Interchange Schedule by 10 MWs. - A) IncreaseNet Interchange /73, /73, /73, /73, /73, /73, /73, /73, /73, /73, /73,
Schedule by 20 MWs.
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A Balancing Authority has a sudden loss of a large block of load in its area. This losswill
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beseen instantaneously in the change of which of the following values?
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1. Actual Net Interchange /73, /73,
2. Scheduled Frequency /73,
3. Scheduled Net Interchange /73, /73,
4. Area Control Error /73, /73,
A) 4 only /73,
B) 1 & 3 /73, /73,
C) 1 & 4 /73, /73,
D) 3 & 4 - C) 1 & 4 /73, /73, /73, /73, /73, /73, /73,
Metered Data included in the calculationofACE are: dynamic schedules, pseudo ties,
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actual frequency, and all
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A) Tie lines readings /73, /73,
B) Generatorsoutput /73,
C) Scheduledfrequencyindications /73, /73,
,D) Transformer load - A) Tie lines readings /73, /73, /73, /73, /73, /73,
Balancing Authority A is currently reading a system frequency of 60.00 Hz. Its Net /73, /73, /73, /73, /73, /73, /73, /73, /73, /73, /7 3, /73, /73,
Actual Interchange is +100 MW and its Net Scheduled Interchange is +200 MW. If
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Balancing Authority A's frequency bias setting is 100 MW/0.1 Hz, what is ACE?
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A) -100
B) 0
C) 10
D) 100 - A) -100 /73, /73, /73,
A Balancing Authority has a Net Interchange Schedule of -250 MWs from1200to 1600
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on a summer day. The Net Interchange Actual for those same hours respectively were
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-230 MW, -275 MW, -250 MW and -270 MW. What was the Balancing Authority's
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Inadvertent Interchange for the 4-hour period?
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A) 6 MWs out /73, /73,
B) 25 MWs in /73, /73,
C) 25 MWs out /73, /73,
D) 6 MWs in - B) 25 MWs in /73, /73, /73, /73, /73, /73, /73,
For the ACE equation to work properly, dynamic schedules, pseudoties,
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frequency, and all
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A) Generation
B) Communications
C) Transformers
D) Tie lines - D) Tie lines /73, /73, /73, /73, /73,
If the frequency bias setting is set to a less negative value than the frequency response
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of a Balancing Authority and a frequencyincrease is caused bya sudden loss of load in an
/73, /73, /73, /73, /73, /73, /73, /73, /73, /73, /73, /73, /73, /73, /73, /73, /73, /73,
external balancing area, what will be the result?
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A) The ACE will bezero and will take no AGC action /73, /73, /73, /73, /73, /73, /73, /73, /73, /73,
B) TheACE will be anegative value and AGC willincrease generation /73, /73, /73, /73, /73, /73, /73, /73, /73, /73, /73,
,C) TheACE will be a positive value and AGC will lower generation
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D) This will not affect the ACE - B) The ACE will be a negative value and AGC will
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increase generation
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If the frequencybias setting is less negative than the frequency response of a Balancing
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Authority and a frequency decline is caused by a sudden loss of generation in an
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external balancing area, what will be the result?
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A) The ACE willbea negative value and AGC will increase generation.
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B) This willnot affect the ACE. /73, /73, /73, /73, /73,
C) TheACE will be a positive value and AGC will lower generation.
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D) The ACE will be zero and will takeno AGC action. - C) The ACE will be a
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positive value and AGC will lower generation.
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It is the responsibility of which entity/entities to develop, maintain, andimplement load
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shedding plans?
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A) Transmission OperatorsandBalancingAuthorities /73, /73, /73, /73,
B) ReliabilityCoordinator /73,
C) Load Serving Entities /73, /73,
D) Balancing Authority -A)TransmissionOperators and Balancing Authorities /73, /73, /73, /73, /73, /73, /73, /73,
A Transmission line is loaded 25% above its SOL. A parallel line is out for routine
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maintenance and can be placed in service in 10 minutes. What is the first step the
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Operator should take to reduce the line loading?
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A) Shed load at the downstreambus. /73, /73, /73, /73, /73,
, B) Open the line. /73, /73,
C) Re-DispatchGeneration. /73,
D) Initiate the restoration of the parallel line. - D) Initiate the restoration of the
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parallel line.
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As a Transmission Operator, you realizethat the voltagelevelis starting to decline in the
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North West part of the system. Which of the following devices should you, as a
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Transmission Operator, be able to operate, and/or have another entity operate to raise
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the voltage level back to normal in the North West part of the system?
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A) TransformerUnderload TapChangers /73, /73, /73,
B) ShuntCapacitorBanks /73, /73,
C) GeneratorReactiveOutput /73, /73,
D) All answers are correct - D) All answers are correct
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Voltage reduction for load relief should be made on the
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A) Distributionsystem /73,
B) EntireInterconnectionsimultaneously /73, /73,
C) Tie-lineswith otherBalancing Authority Areas /73, /73, /73, /73, /73,
D) Transmission System-A)Distributionsystem /73, /73, /73, /73, /73,
Under Frequency Load Shedding (UFLS)istostabilize the imbalancebetween
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generation and load that has been created by a system disturbance. This is
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accomplished by
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A) Trippinggeneration first /73, /73,
B) Voltagereductiononthedistributionsystem. /73, /73, /73, /73, /73,
C) Shedding all load to arrest frequency /73, /73, /73, /73, /73,
D) Shedding load prior to generation tripping - D) Shedding load prior to /73, /73, /73, /73, /73, /73, /73, /73, /73, /73, /73,
generation tripping
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The Reliability Coordinator just informed you of a slow time error correction which
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will begin at the top of the next hour. Your EMS system will not let you change your
/73, /73, /73, /73, /73, /73, /73, /73, /73, /73, /73, /73, /73, /73, /73, /73, /73, /73,
scheduled frequency. Your FrequencyBias Setting is -100 MW/.1Hz. What action
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should you take?
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A) Increase Net Interchange Schedule by 20 MWs. /73, /73, /73, /73, /73, /73,
B) Informthe Reliability Coordinator thatyou cannot participate in the time error /73, /73, /73, /73, /73, /73, /73, /73, /73, /73, /73,
correction.
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C) Decrease Net Interchange Schedule by20 MWs. /73, /73, /73, /73, /73, /73,
D) Increase Net Interchange Schedule by 10 MWs. - A) IncreaseNet Interchange /73, /73, /73, /73, /73, /73, /73, /73, /73, /73, /73,
Schedule by 20 MWs.
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A Balancing Authority has a sudden loss of a large block of load in its area. This losswill
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beseen instantaneously in the change of which of the following values?
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1. Actual Net Interchange /73, /73,
2. Scheduled Frequency /73,
3. Scheduled Net Interchange /73, /73,
4. Area Control Error /73, /73,
A) 4 only /73,
B) 1 & 3 /73, /73,
C) 1 & 4 /73, /73,
D) 3 & 4 - C) 1 & 4 /73, /73, /73, /73, /73, /73, /73,
Metered Data included in the calculationofACE are: dynamic schedules, pseudo ties,
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actual frequency, and all
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A) Tie lines readings /73, /73,
B) Generatorsoutput /73,
C) Scheduledfrequencyindications /73, /73,
,D) Transformer load - A) Tie lines readings /73, /73, /73, /73, /73, /73,
Balancing Authority A is currently reading a system frequency of 60.00 Hz. Its Net /73, /73, /73, /73, /73, /73, /73, /73, /73, /73, /7 3, /73, /73,
Actual Interchange is +100 MW and its Net Scheduled Interchange is +200 MW. If
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Balancing Authority A's frequency bias setting is 100 MW/0.1 Hz, what is ACE?
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A) -100
B) 0
C) 10
D) 100 - A) -100 /73, /73, /73,
A Balancing Authority has a Net Interchange Schedule of -250 MWs from1200to 1600
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on a summer day. The Net Interchange Actual for those same hours respectively were
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-230 MW, -275 MW, -250 MW and -270 MW. What was the Balancing Authority's
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Inadvertent Interchange for the 4-hour period?
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A) 6 MWs out /73, /73,
B) 25 MWs in /73, /73,
C) 25 MWs out /73, /73,
D) 6 MWs in - B) 25 MWs in /73, /73, /73, /73, /73, /73, /73,
For the ACE equation to work properly, dynamic schedules, pseudoties,
/73, /73, /73, /73, /73, /73, /73, /73, /73, /73,
frequency, and all
/73, must be metered. /73, /73, /73, /73, /73,
A) Generation
B) Communications
C) Transformers
D) Tie lines - D) Tie lines /73, /73, /73, /73, /73,
If the frequency bias setting is set to a less negative value than the frequency response
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of a Balancing Authority and a frequencyincrease is caused bya sudden loss of load in an
/73, /73, /73, /73, /73, /73, /73, /73, /73, /73, /73, /73, /73, /73, /73, /73, /73, /73,
external balancing area, what will be the result?
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A) The ACE will bezero and will take no AGC action /73, /73, /73, /73, /73, /73, /73, /73, /73, /73,
B) TheACE will be anegative value and AGC willincrease generation /73, /73, /73, /73, /73, /73, /73, /73, /73, /73, /73,
,C) TheACE will be a positive value and AGC will lower generation
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D) This will not affect the ACE - B) The ACE will be a negative value and AGC will
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increase generation
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If the frequencybias setting is less negative than the frequency response of a Balancing
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Authority and a frequency decline is caused by a sudden loss of generation in an
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external balancing area, what will be the result?
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A) The ACE willbea negative value and AGC will increase generation.
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B) This willnot affect the ACE. /73, /73, /73, /73, /73,
C) TheACE will be a positive value and AGC will lower generation.
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D) The ACE will be zero and will takeno AGC action. - C) The ACE will be a
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positive value and AGC will lower generation.
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It is the responsibility of which entity/entities to develop, maintain, andimplement load
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shedding plans?
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A) Transmission OperatorsandBalancingAuthorities /73, /73, /73, /73,
B) ReliabilityCoordinator /73,
C) Load Serving Entities /73, /73,
D) Balancing Authority -A)TransmissionOperators and Balancing Authorities /73, /73, /73, /73, /73, /73, /73, /73,
A Transmission line is loaded 25% above its SOL. A parallel line is out for routine
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maintenance and can be placed in service in 10 minutes. What is the first step the
/73, /73, /73, /73, /73, /73, /73, /73, /73, /73, /73, /73, /73, /73, /73, /73,
Operator should take to reduce the line loading?
/73, /73, /73, /73, /73, /73, /73, /73,
A) Shed load at the downstreambus. /73, /73, /73, /73, /73,
, B) Open the line. /73, /73,
C) Re-DispatchGeneration. /73,
D) Initiate the restoration of the parallel line. - D) Initiate the restoration of the
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parallel line.
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As a Transmission Operator, you realizethat the voltagelevelis starting to decline in the
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North West part of the system. Which of the following devices should you, as a
/73, /73, /73, /73, /73, /73, /73, / 73, /73, /73, /73, /73, /73, /73, /73,
Transmission Operator, be able to operate, and/or have another entity operate to raise
/73, /73, /73, /73, /73, /73, /73, /73, /73, /73, /73, /73, /73,
the voltage level back to normal in the North West part of the system?
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A) TransformerUnderload TapChangers /73, /73, /73,
B) ShuntCapacitorBanks /73, /73,
C) GeneratorReactiveOutput /73, /73,
D) All answers are correct - D) All answers are correct
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Voltage reduction for load relief should be made on the
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A) Distributionsystem /73,
B) EntireInterconnectionsimultaneously /73, /73,
C) Tie-lineswith otherBalancing Authority Areas /73, /73, /73, /73, /73,
D) Transmission System-A)Distributionsystem /73, /73, /73, /73, /73,
Under Frequency Load Shedding (UFLS)istostabilize the imbalancebetween
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generation and load that has been created by a system disturbance. This is
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accomplished by
/73, . /73, /73,
A) Trippinggeneration first /73, /73,
B) Voltagereductiononthedistributionsystem. /73, /73, /73, /73, /73,
C) Shedding all load to arrest frequency /73, /73, /73, /73, /73,
D) Shedding load prior to generation tripping - D) Shedding load prior to /73, /73, /73, /73, /73, /73, /73, /73, /73, /73, /73,
generation tripping
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