HSI Final Test Exam 99 Questions with Correct Answers.
The initial response to a frequency deviation is due to which of the following
1. Load / frequency response
2. AGC
3. Governor action
4. Interchange schedules
•3 and 4
•1 and 2
•2 and 3
•1 and 3 - Correct Answer •1 and 3
EMS and AGC have failed at 12:25 and generation must be controlled manually. The
operator calculates ACE to be +25 MWs. Load is expected to increase 100 MWs, and
imports will increase by 75 MWs at the top of the hour. What should the operator do?
•Maintain current generation level
•Decrease generation by 25 MWs
•Decrease generation by 50 MWs
•Increase generation by 25 MW - Correct Answer •Decrease generation by 25 MWs
How is the Frequency Response Measure (FRM) of a Balancing Authority determined?
•lt is the average of the BA's frequency response for all the frequency deviations of the
previous year
•lt is the change in the BA's Net Interchange Actual for the largest frequency deviation
during the previous year
•lt is the previous year's Control Performance Standard 1 ( CPS1 ) score
•It is the median of the BA's frequency response for the frequency deviation events
identified by NERC for the previous year - Correct Answer •It is the median of the BA's
frequency response for the frequency deviation events identified by NERC for the previous
year
Sufficient Operating Reserve is defined as the capacity required to meet what?
•DOE specifications
•CPS and DCS
•CPS 1 & 2 only
•Capacity Standard - Correct Answer •CPS and DCS
In your Interconnection , a generator tripped that was large enough to reduce the
frequency from 60.00 Hz to 59.94 Hz . Your Balancing Authority's Frequency Bias is -200
MW / 0.1 Hz . How many MW would your system initially contribute to frequency support?
•120 MW
,•80 MW
•100 MW
•200 MW - Correct Answer •120 MW
Interconnection frequency is 59.80 Hz . Your ACE is a large negative value and your AGC
is pulsing your units down . What should you do
•Leave AGC in operation but investigate
•Place AGC in constant frequency control
•Place AGC in flat tie line control
•Suspend AGC and investigate - Correct Answer •Suspend AGC and investigate
When a Balancing Authority's ACE value is the same sign as the frequency deviation ,
which NERC control performance score is affected negatively
•DCS
•CPS 1
•TEC
•BAAL - Correct Answer •CPS 1
Correct Of the following , which control system would be affected by a difference in Net
Actual Interchange and Net Scheduled Interchange
•Reactive Control
•Turbine Governor Control
•Automatic Generation Control
•Automatic Voltage Regulator - Correct Answer •Automatic Generation Control
Balancing Authority A is currently reading a system frequency of 59.98 Hz . Its Net Actual
Interchange is +100 MW and its Net Scheduled Interchange is +100 MW . If Balancing
Authority A's frequency bias setting is 100 MW / 0.1 HZ , what is ACE
• -20
•20
•2
•0 - Correct Answer • -20
A Balancing Authority has twenty units on governor control . The units have different
capacities that range from 200 MW to 1000 MW and droop settings from 2 % to 5 % . The
biggest adjustments in megawatt output in response to a frequency disturbance will be
provided by units that have _______________?
•large capacity and small droop setting
•large capacity and large droop setting
•small capacity and small droop setting
, •small capacity and large droop setting - Correct Answer •large capacity and small droop
setting
Balancing Authority A is scheduled to import 300 MW but is only importing 260 MW .
Interconnection frequency is 59.94 and Balancing Authority A's Frequency Bias Setting is -
120 MW / 0.1 Hz What is Balancing Authority A's ACE reading?
• -32 MW
• +32 MW
• 0 MW
• -112 MW - Correct Answer • -32 MW
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 - Correct Answer •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 - Correct Answer •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 - Correct Answer •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
The initial response to a frequency deviation is due to which of the following
1. Load / frequency response
2. AGC
3. Governor action
4. Interchange schedules
•3 and 4
•1 and 2
•2 and 3
•1 and 3 - Correct Answer •1 and 3
EMS and AGC have failed at 12:25 and generation must be controlled manually. The
operator calculates ACE to be +25 MWs. Load is expected to increase 100 MWs, and
imports will increase by 75 MWs at the top of the hour. What should the operator do?
•Maintain current generation level
•Decrease generation by 25 MWs
•Decrease generation by 50 MWs
•Increase generation by 25 MW - Correct Answer •Decrease generation by 25 MWs
How is the Frequency Response Measure (FRM) of a Balancing Authority determined?
•lt is the average of the BA's frequency response for all the frequency deviations of the
previous year
•lt is the change in the BA's Net Interchange Actual for the largest frequency deviation
during the previous year
•lt is the previous year's Control Performance Standard 1 ( CPS1 ) score
•It is the median of the BA's frequency response for the frequency deviation events
identified by NERC for the previous year - Correct Answer •It is the median of the BA's
frequency response for the frequency deviation events identified by NERC for the previous
year
Sufficient Operating Reserve is defined as the capacity required to meet what?
•DOE specifications
•CPS and DCS
•CPS 1 & 2 only
•Capacity Standard - Correct Answer •CPS and DCS
In your Interconnection , a generator tripped that was large enough to reduce the
frequency from 60.00 Hz to 59.94 Hz . Your Balancing Authority's Frequency Bias is -200
MW / 0.1 Hz . How many MW would your system initially contribute to frequency support?
•120 MW
,•80 MW
•100 MW
•200 MW - Correct Answer •120 MW
Interconnection frequency is 59.80 Hz . Your ACE is a large negative value and your AGC
is pulsing your units down . What should you do
•Leave AGC in operation but investigate
•Place AGC in constant frequency control
•Place AGC in flat tie line control
•Suspend AGC and investigate - Correct Answer •Suspend AGC and investigate
When a Balancing Authority's ACE value is the same sign as the frequency deviation ,
which NERC control performance score is affected negatively
•DCS
•CPS 1
•TEC
•BAAL - Correct Answer •CPS 1
Correct Of the following , which control system would be affected by a difference in Net
Actual Interchange and Net Scheduled Interchange
•Reactive Control
•Turbine Governor Control
•Automatic Generation Control
•Automatic Voltage Regulator - Correct Answer •Automatic Generation Control
Balancing Authority A is currently reading a system frequency of 59.98 Hz . Its Net Actual
Interchange is +100 MW and its Net Scheduled Interchange is +100 MW . If Balancing
Authority A's frequency bias setting is 100 MW / 0.1 HZ , what is ACE
• -20
•20
•2
•0 - Correct Answer • -20
A Balancing Authority has twenty units on governor control . The units have different
capacities that range from 200 MW to 1000 MW and droop settings from 2 % to 5 % . The
biggest adjustments in megawatt output in response to a frequency disturbance will be
provided by units that have _______________?
•large capacity and small droop setting
•large capacity and large droop setting
•small capacity and small droop setting
, •small capacity and large droop setting - Correct Answer •large capacity and small droop
setting
Balancing Authority A is scheduled to import 300 MW but is only importing 260 MW .
Interconnection frequency is 59.94 and Balancing Authority A's Frequency Bias Setting is -
120 MW / 0.1 Hz What is Balancing Authority A's ACE reading?
• -32 MW
• +32 MW
• 0 MW
• -112 MW - Correct Answer • -32 MW
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 - Correct Answer •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 - Correct Answer •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 - Correct Answer •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
