NERC Practice Set 3 Questions with complete solution 2023
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NERC Practice Set 3
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NERC Practice Set 3
NERC Practice Set 3 Questions with complete solution 2023
b. Perform power flow study in preparation of opening Line 1 - correct answer
Your system is experiencing heavy loading and low voltage . What is the first response for a System Operator ?
a) Take lines out of service
b) Put c...
NERC Practice Set 3 Questions with complete solution 2023
b. Perform power flow study in preparation of opening Line 1 - correct answer Your system is experiencing heavy loading and low voltage . What is the first response for a System Operator ?
a) Take lines out of service
b) Put capacitors in service
c) Put reactors in service
d) Lower loads - correct answer b) Put capacitors in service
Which of the following action is appropriate for mitigating heavy power transfer on a transmission line ?
a) Put parallel line in service
b) Put a capacitor in service
c) Put a reactor in service
d) Increase generation - correct answer a) Put parallel line in service
Line A is a 100 mile 500kV transmission line. Line B is a 10 mile 500 kV transmission line. Both lines are lightly loaded. Line B is contributing 3.2MVAR to the bus. How much MVAR will line A contribute to the bus ?
a) 10 times 3.2 MVAR
b) Less than 3.2 MVAR
c) Equal to 3.2 MVAR
d) More than 3.2 MVAR - correct answer d) More than 3.2 MVAR
What are the effects of transmission line loading above its surge impedance loading ?
a) The line acts like a capacitor
b) The line acts like a reactor
c) The line ceases to function
d) The line's losses decrease - correct answer b) The line acts like a reactor
After a forced outage , a contingency analysis study shows that one more outage will cause an IROL violation . There is a parallel line out for maintenance that can be returned within a 4 hours window if requested . What must be done first to mitigate this condition ?
a) Put the parallel line in service with protection
b) Put the parallel line in service without protection c) Take the protective tripping off the line
d) Call the RC and formulate an Operating Plan - correct answer d) Call the RC and formulate an Operating Plan
A transformer rated at 100 MVA has 80 MW flowing through it. How many MVARS could flow through it without exceeding its rating?
a) 80 MVAR
b) 60 MVAR
c) 50 MVAR
d) 20 MVAR - correct answer b) 60 MVAR
A system operator notices that frequency has dropped to 59.95 Hz and his Balancing Area's ACE is near zero . The Balancing Authority has plenty of generation to help restore the Interconnection Frequency . Which statement best describes the appropriate
action?
a) Increase generation to improve his CPS score
b) Notify the deficient BA to sell them power
c) Take units off of AGC
d) Ensure that generators are providing governor response - correct answer d) Ensure that generators are providing governor response
A transmission path is rated at 550 MVA and has 500 MW and 55 MVAR of power flowing on the line. What action is required of the system operator ?
a) The line has exceeded its rating is beyond its rating and power flow must be reduce
b) The line will trip if not removed from service
c) No action beyond continued monitoring is required
d) Reconfiguration is needed to lower the reactive power flow - correct answer c) No action beyond continued monitoring is required
If two heavily loaded transmission lines into a Balancing Authority area trip resulting in that area being islanded , what is the likely impact to Interconnection frequency?
a) Interconnection frequency will remain the same
b) Interconnection frequency will likely increase
c) Interconnection frequency will likely decrease
d) The island will have its own frequency - correct answer b) Interconnection frequency will likely increase
11. Which transmission line type will likely produce more reactive power ?
a) Underground cable
b) Lightly loaded short overhead line
c) Loaded tie - line
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