HSI Final Test Questions with 100% Correct
Answers |Verified
Which of the following is used to calculate a Balancing Authority's yearly Frequency Response
Obligation (FRO)
•The Balancing Authority's percentage of the Interconnection's generation and load
•The Balancing Authority's average Frequency Bias Setting for the previous year
•The Balancing Authority's average ACE for the previous year
•The change in the Balancing Authority's Net Interchange Actual for a frequency deviation of .1
Hz - ✔✔•The Balancing Authority's percentage of the Interconnection's generation and load
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?
•The ACE will be a negative value and AGC will increase generation
•The ACE will be a positive value and AGC will lower generation
•The ACE will be zero and will take no AGC action
•This will not affect the ACE - ✔✔•The ACE will be a positive value and AGC will lower
generation
Once a Balancing Authority informs the Reliability Coordinator of future or current Capacity and
Energy Emergencies , it is the responsibility of the to mitigate the emergency condition?
•Reliability Coordinator and Balancing Authority
•Transmission Owner
•Transmission Operator
,•Balancing Authority - ✔✔•Reliability Coordinator and Balancing Authority
Re - synchronization with the Interconnection should only be attempted at a
________________?
•Substation with auto re - closing relays
•Location with a synchroscope
•Substation with an auto synchronization relay
•Generating plant with an auto - synchronization relay - ✔✔•Location with a synchroscope
A radial transmission line feeding a load is overloaded . The Transmission Operator must do
which of the following to unload the line?
•Raise interchange schedule
•Lower interchange schedule
•Re - dispatch generation
•Shed load at the end of the line - ✔✔•Shed load at the end of the line
If a Balancing Authority is unable to purchase capacity or energy to meet its demand and
reserve requirements on a day-ahead or hour-by-hour basis, which entity (or entities), is it
expected to notify?
•All Reliability Coordinators and marketers
•All Reliability Coordinators
•Transmission Operators
•lts Reliability Coordinator and other Balancing Authorities - ✔✔•lts Reliability Coordinator
and other Balancing Authorities
Why are high transmission system voltages a problem during system restoration ?
,•Because of shunt reactors that were left in service after the system collapse
•Because of insufficient MVAR supply from generators that tripped off
•Because of the excessive MVAR supply from generators
•Because of the excessive MVAR supply from energizing transmission lines - ✔✔•Because of
the excessive MVAR supply from energizing transmission lines
A Balancing Authority anticipating an operating capacity or energy emergency shall perform all
actions necessary . including 1 ) bringing on all available generation 2 ) postponing equipment
return . scheduling interchange sales being prepared to reduce firm load
•2 and 3
•1 and 2
•1 and 4
•3 and 4 - ✔✔•1 and 4
If a circuit breaker does not have a synch - check , reclosing relay and has a large standing phase
angle across it , how can the system operator know if it is safe to close the breaker avoiding
shock torque to the neighboring generators ?
•Ask the generator operators to change reactive to a leading power factor and then check the
frequency
•Use the synchroscope in the substation control room as a guide to show you how to adjust the
system to improve the phase angle
•lf the voltage is within +/- 10 % it is OK to close the breaker
•Obtain help from the Regional operating committee engineers to advise you . - ✔✔•Use
the synchroscope in the substation control room as a guide to show you how to adjust the
system to improve the phase angle
, A Balancing Authority anticipating a capacity or energy deficiency emergency, shall perform
which of the actions
•load shedding
•voltage reduction
•transmission line switching
•all necessary actions - ✔✔•all necessary actions
How often should the Transmission Operator and Balancing Authority review and update their
Loss of Control Room Functionality Operating Plan
•Every two years
•Every three years
•Annually
•As needed - ✔✔•Annually
During a system restoration , what is the system operators priority
•Restoration of interchange
•Restoration of off - site startup power to generating facilities
•Restoration of customer load •Interconnection frequency - ✔✔•Restoration of off - site
startup power to generating facilities
When synchronizing sections of the transmission system that have separated or islanded ,
frequency and voltage magnitude on each side of the breaker and the power angle across the
breaker must be within proper limits . To bring these values within proper limits , the system
operator should _______________?
•Adjust the power angle on one side of the breaker to 90 degrees
Answers |Verified
Which of the following is used to calculate a Balancing Authority's yearly Frequency Response
Obligation (FRO)
•The Balancing Authority's percentage of the Interconnection's generation and load
•The Balancing Authority's average Frequency Bias Setting for the previous year
•The Balancing Authority's average ACE for the previous year
•The change in the Balancing Authority's Net Interchange Actual for a frequency deviation of .1
Hz - ✔✔•The Balancing Authority's percentage of the Interconnection's generation and load
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?
•The ACE will be a negative value and AGC will increase generation
•The ACE will be a positive value and AGC will lower generation
•The ACE will be zero and will take no AGC action
•This will not affect the ACE - ✔✔•The ACE will be a positive value and AGC will lower
generation
Once a Balancing Authority informs the Reliability Coordinator of future or current Capacity and
Energy Emergencies , it is the responsibility of the to mitigate the emergency condition?
•Reliability Coordinator and Balancing Authority
•Transmission Owner
•Transmission Operator
,•Balancing Authority - ✔✔•Reliability Coordinator and Balancing Authority
Re - synchronization with the Interconnection should only be attempted at a
________________?
•Substation with auto re - closing relays
•Location with a synchroscope
•Substation with an auto synchronization relay
•Generating plant with an auto - synchronization relay - ✔✔•Location with a synchroscope
A radial transmission line feeding a load is overloaded . The Transmission Operator must do
which of the following to unload the line?
•Raise interchange schedule
•Lower interchange schedule
•Re - dispatch generation
•Shed load at the end of the line - ✔✔•Shed load at the end of the line
If a Balancing Authority is unable to purchase capacity or energy to meet its demand and
reserve requirements on a day-ahead or hour-by-hour basis, which entity (or entities), is it
expected to notify?
•All Reliability Coordinators and marketers
•All Reliability Coordinators
•Transmission Operators
•lts Reliability Coordinator and other Balancing Authorities - ✔✔•lts Reliability Coordinator
and other Balancing Authorities
Why are high transmission system voltages a problem during system restoration ?
,•Because of shunt reactors that were left in service after the system collapse
•Because of insufficient MVAR supply from generators that tripped off
•Because of the excessive MVAR supply from generators
•Because of the excessive MVAR supply from energizing transmission lines - ✔✔•Because of
the excessive MVAR supply from energizing transmission lines
A Balancing Authority anticipating an operating capacity or energy emergency shall perform all
actions necessary . including 1 ) bringing on all available generation 2 ) postponing equipment
return . scheduling interchange sales being prepared to reduce firm load
•2 and 3
•1 and 2
•1 and 4
•3 and 4 - ✔✔•1 and 4
If a circuit breaker does not have a synch - check , reclosing relay and has a large standing phase
angle across it , how can the system operator know if it is safe to close the breaker avoiding
shock torque to the neighboring generators ?
•Ask the generator operators to change reactive to a leading power factor and then check the
frequency
•Use the synchroscope in the substation control room as a guide to show you how to adjust the
system to improve the phase angle
•lf the voltage is within +/- 10 % it is OK to close the breaker
•Obtain help from the Regional operating committee engineers to advise you . - ✔✔•Use
the synchroscope in the substation control room as a guide to show you how to adjust the
system to improve the phase angle
, A Balancing Authority anticipating a capacity or energy deficiency emergency, shall perform
which of the actions
•load shedding
•voltage reduction
•transmission line switching
•all necessary actions - ✔✔•all necessary actions
How often should the Transmission Operator and Balancing Authority review and update their
Loss of Control Room Functionality Operating Plan
•Every two years
•Every three years
•Annually
•As needed - ✔✔•Annually
During a system restoration , what is the system operators priority
•Restoration of interchange
•Restoration of off - site startup power to generating facilities
•Restoration of customer load •Interconnection frequency - ✔✔•Restoration of off - site
startup power to generating facilities
When synchronizing sections of the transmission system that have separated or islanded ,
frequency and voltage magnitude on each side of the breaker and the power angle across the
breaker must be within proper limits . To bring these values within proper limits , the system
operator should _______________?
•Adjust the power angle on one side of the breaker to 90 degrees
