HSI Final Test Questions exam study guide questions with correct answers verified 100%

HSI Final Test Questions exam study guide questions with correct answers verified 100%HSI Final Test Questions exam study guide questions with correct answers verified 100%HSI Final Test Questions exam study guide questions with correct answers verified 100% 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 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 - correct 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 •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 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 - correct 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 - correct 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 - correct 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 •DCS •CPS 1 •TEC •BAAL - correct 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 - correct 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 - correct 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 - correct 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? • -32 MW • +32 MW • 0 MW • -112 MW - correct answers-• -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 answers-•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 answers-•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 answers-•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 - correct answers-•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 - correct answers-•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 - correct answers-•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 - correct answers-•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 - correct answers-•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 . - correct answers-•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 - correct answers-•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 - correct answers-•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 - correct answers-•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 •Adjust the tap changer on the nearest transformer •Open additional lines until the voltage is matched •Adjust generator MW and MVAR output in one of the areas - correct answers-•Adjust generator MW and MVAR output in one of the areas Which of the following best describes the Load / Frequency Relationship •Load magnitude is independent of the system frequency •Load magnitude varies with system frequency •As frequency increases , load decreases •Only non - motor loads are affected by a change in system frequency . - correct answers-•Load magnitude