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Exam (elaborations)

HSI Final Test Questions Questions and Answers (100% Pass)

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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 •1 and 3 EMS and AGC have failed at 12:25 and generation must be controlled manua...

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  • October 12, 2024
  • 49
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • HSI
  • HSI
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1 | P a g e | © copyright 2024/2025 | Grade A+




HSI Final Test Questions Questions
and Answers (100% Pass)
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 •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


Master01 | October, 2024/2025 | Latest update

, 1 | P a g e | © copyright 2024/2025 | Grade A+

•Decrease generation by 25 MWs


•Decrease generation by 50 MWs


✓ •Increase generation by 25 MW •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 •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

Master01 | October, 2024/2025 | Latest update

, 1 | P a g e | © copyright 2024/2025 | Grade A+

•CPS and DCS


•CPS 1 & 2 only


✓ •Capacity Standard •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 •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


Master01 | October, 2024/2025 | Latest update

, 1 | P a g e | © copyright 2024/2025 | Grade A+

✓ •Suspend AGC and investigate •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 •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 •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


Master01 | October, 2024/2025 | Latest update

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