©THESTAR EXAM SOLUTIONS 2024/2025
ALL RIGHTS RESERVED.
HSI Final Test Questions With Verified
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 - Answers✔•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 - Answers✔•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
, ©THESTAR EXAM SOLUTIONS 2024/2025
ALL RIGHTS RESERVED.
•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 - Answers✔•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 - Answers✔•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 - Answers✔•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 - Answers✔•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
, ©THESTAR EXAM SOLUTIONS 2024/2025
ALL RIGHTS RESERVED.
•DCS
•CPS 1
•TEC
•BAAL - Answers✔•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 - Answers✔•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 - Answers✔• -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 - Answers✔•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?
ALL RIGHTS RESERVED.
HSI Final Test Questions With Verified
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 - Answers✔•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 - Answers✔•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
, ©THESTAR EXAM SOLUTIONS 2024/2025
ALL RIGHTS RESERVED.
•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 - Answers✔•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 - Answers✔•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 - Answers✔•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 - Answers✔•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
, ©THESTAR EXAM SOLUTIONS 2024/2025
ALL RIGHTS RESERVED.
•DCS
•CPS 1
•TEC
•BAAL - Answers✔•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 - Answers✔•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 - Answers✔• -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 - Answers✔•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?
