SOS NERC Prep - RElIABILITY Exam Questions and Answers Already Passed
A) Increase Net Interchange Schedule by 20 MWs. - 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.
C) 1 & 4 - Answers 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
A) Tie lines readings - Answers 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) -100 - 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
B) 25 MWs in - Answers 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
D) Tie lines - Answers 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
B) The ACE will be a negative value and AGC will increase generation - Answers 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?
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
C) The ACE will be a positive value and AGC will lower generation. - Answers 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.
A) Transmission Operators and Balancing Authorities - Answers 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
D) Initiate the restoration of the parallel line. - 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) All answers are correct - Answers 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
A) Distribution system - Answers Voltage reduction for load relief should be made on the __________.
A) Increase Net Interchange Schedule by 20 MWs. - 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.
C) 1 & 4 - Answers 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
A) Tie lines readings - Answers 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) -100 - 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
B) 25 MWs in - Answers 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
D) Tie lines - Answers 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
B) The ACE will be a negative value and AGC will increase generation - Answers 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?
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
C) The ACE will be a positive value and AGC will lower generation. - Answers 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.
A) Transmission Operators and Balancing Authorities - Answers 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
D) Initiate the restoration of the parallel line. - 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) All answers are correct - Answers 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
A) Distribution system - Answers Voltage reduction for load relief should be made on the __________.
