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HSI Final Test Questions with 100% Correct Answers
HSI Final Test Questions with 100% Correct Answers
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HSI Final Test Questions with 100%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 - -•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 - -•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
•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
•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 MW . If Balancing Authority A's frequency bias setting is 100 MW / 0.1
HZ , what is ACE
• -20
•20
•2
•0 - -• -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 - -•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 - -• -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 - -•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
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