NERC PREP TEST 101 Exam Questions and
Answers
1. If a 500 kV transmission line with a surge impedance loading of 800 MW is
currently loaded at 1400 MW, which of the following events would most likely
occur?
a. Generator MVAR output would increase
b. All system capacitors would trip off-line
c. Generator MVAR output would decrease
d. All automatic reactors would connect to the system - a. Generator MVAR output
would increase
2. When system conditions are such that emergency procedures are expected to be
implemented, which of the following actions should be considered first?
a. Shed firm load
b. Implement Active Load Management
c. Return outaged equipment to service
d. Request a voltage reduction - c. Return outaged equipment to service
3. If your transmission path is rated for 1200 MW and 1000 MW are scheduled on
it, but due to parallel flows the actual flow is 1300 MW, what action should you
take?
a. Request that a phase shifting transformer be installed
b. Reduce interchange transactions impacting the path
c. Request all parallel flow to PSEs to increase schedules
d. Reduce all commercial customer load - b. Reduce interchange transactions
impacting the path
4. If your system is MVAR deficient, what action could be implemented to prevent
voltage collapse?
a. Raise system frequency above 60.5 Hz
,b. Shed firm load in the deficient area
c. Separate from the Interconnection
d. Lower transmission voltages - b. Shed firm load in the deficient area
5. Which of the following actions can a system operator take in order to maintain
stability on the system?
a. Request generators to absorb maximum MVAR
b. Place all operating limits on dynamic calculation
c. Raise system voltages as high as possible, but within their operating parameters
d. Reduce voltages on the transmission system - c. Raise system voltages as high
as possible, but within their operating parameters
6. Which of the following actions should you take if an outage on a neighboring
system has caused a violation on your system?
a. Open all tie-lines to your neighbor
b. Ask the Reliability Coordinator for assistance
c. Shed load to mitigate the violation
d. Wait for the neighboring system to contact you - b. Ask the Reliability
Coordinator for assistance
7. If a SOL or IROL violation occurs due to transfers across the system and it is
determined that parallel flows are contributing to the violation, what should the
system operator do?
a. Place all system capacitors in service
b. Reduce system load
c. Inform the Reliability Coordinator
d. Dump firm load - c. Inform the Reliability Coordinator
8. While performing a pre-outage study, you identify that the transmission outage
will cause a thermal violation on a parallel path, which of the following actions
would be the first one you would implement?
a. Shed load to mitigate the concern
,b. Allow the outage to occur and see what happens
c. Reschedule the outage if possible
d. Allow the outage to take place as long as no load is lost - c. Reschedule the
outage if possible
9. Which of the following actions should the system operator implement first if
transmission line limits exceed the facilities emergency limits based on a
contingency that has not yet occurred, but their protocols are to respond on a pre-
contingency basis?
a. Reduce voltages in the area of the violation
b. Remove the facility from service
c. Curtail any interchange transactions that are curtailable
d. Only implement actions if the contingency occurs - c. Curtail any interchange
transactions that are curtailable
10. If a Reliability Coordinator had to implement any type of line loading relief
procedures, which of the following entities would they be coordinated with? Pick
two.
a. Purchasing Selling Entities
b. Balancing Authorities
c. Transmission Operators
d. Load Serving Entities - b. Balancing Authorities
c. Transmission Operators
11. If a generator is lost in a neighboring Balancing Area, what would the impact
be on the BAs transmission tie lines?
a. Nothing
b. A net increase of MW would come into your BAs system
c. A net increase of MW would go out of your BAs system
d. They would exceed their emergency limits - c. A net increase of MW would go
out of your BAs system
, 12. According to the NERC Glossary, a constrained facility is defined as a
transmission facility that is approaching, is at, or is beyond its?
a. SOL or IROL
b. Normal voltage parameters
c. Available Transfer Capability
d. Economic operating point - a. SOL or IROL
13. How should a Transmission Operator that is affected by or contributing to
transmission SOL or IROL limit violations respond to the situation?
a. When time permits
b. In coordination with other impacted entities
c. Independent of all other parties
d. Only at the direction of the Reliability Coordinator - b. In coordination with
other impacted entities
14. If a transmission operator is experiencing a SOL or IROL violation, how long
does the entity have to correct the problem?
a. 10 minutes
b. 20 minutes
c. 30 minutes
d. 60 minutes - c. 30 minutes
15. If your system is experiencing high system loads, high system imports, and
transmission facilities loaded to 100%, which of the following situations would
make the situation worse?
a. Loss of a distribution station
b. An internal generator tripping
c. A bulk capacitor connecting to the system
d. A 500 kV transmission line returned to service - b. An internal generator
tripping
Answers
1. If a 500 kV transmission line with a surge impedance loading of 800 MW is
currently loaded at 1400 MW, which of the following events would most likely
occur?
a. Generator MVAR output would increase
b. All system capacitors would trip off-line
c. Generator MVAR output would decrease
d. All automatic reactors would connect to the system - a. Generator MVAR output
would increase
2. When system conditions are such that emergency procedures are expected to be
implemented, which of the following actions should be considered first?
a. Shed firm load
b. Implement Active Load Management
c. Return outaged equipment to service
d. Request a voltage reduction - c. Return outaged equipment to service
3. If your transmission path is rated for 1200 MW and 1000 MW are scheduled on
it, but due to parallel flows the actual flow is 1300 MW, what action should you
take?
a. Request that a phase shifting transformer be installed
b. Reduce interchange transactions impacting the path
c. Request all parallel flow to PSEs to increase schedules
d. Reduce all commercial customer load - b. Reduce interchange transactions
impacting the path
4. If your system is MVAR deficient, what action could be implemented to prevent
voltage collapse?
a. Raise system frequency above 60.5 Hz
,b. Shed firm load in the deficient area
c. Separate from the Interconnection
d. Lower transmission voltages - b. Shed firm load in the deficient area
5. Which of the following actions can a system operator take in order to maintain
stability on the system?
a. Request generators to absorb maximum MVAR
b. Place all operating limits on dynamic calculation
c. Raise system voltages as high as possible, but within their operating parameters
d. Reduce voltages on the transmission system - c. Raise system voltages as high
as possible, but within their operating parameters
6. Which of the following actions should you take if an outage on a neighboring
system has caused a violation on your system?
a. Open all tie-lines to your neighbor
b. Ask the Reliability Coordinator for assistance
c. Shed load to mitigate the violation
d. Wait for the neighboring system to contact you - b. Ask the Reliability
Coordinator for assistance
7. If a SOL or IROL violation occurs due to transfers across the system and it is
determined that parallel flows are contributing to the violation, what should the
system operator do?
a. Place all system capacitors in service
b. Reduce system load
c. Inform the Reliability Coordinator
d. Dump firm load - c. Inform the Reliability Coordinator
8. While performing a pre-outage study, you identify that the transmission outage
will cause a thermal violation on a parallel path, which of the following actions
would be the first one you would implement?
a. Shed load to mitigate the concern
,b. Allow the outage to occur and see what happens
c. Reschedule the outage if possible
d. Allow the outage to take place as long as no load is lost - c. Reschedule the
outage if possible
9. Which of the following actions should the system operator implement first if
transmission line limits exceed the facilities emergency limits based on a
contingency that has not yet occurred, but their protocols are to respond on a pre-
contingency basis?
a. Reduce voltages in the area of the violation
b. Remove the facility from service
c. Curtail any interchange transactions that are curtailable
d. Only implement actions if the contingency occurs - c. Curtail any interchange
transactions that are curtailable
10. If a Reliability Coordinator had to implement any type of line loading relief
procedures, which of the following entities would they be coordinated with? Pick
two.
a. Purchasing Selling Entities
b. Balancing Authorities
c. Transmission Operators
d. Load Serving Entities - b. Balancing Authorities
c. Transmission Operators
11. If a generator is lost in a neighboring Balancing Area, what would the impact
be on the BAs transmission tie lines?
a. Nothing
b. A net increase of MW would come into your BAs system
c. A net increase of MW would go out of your BAs system
d. They would exceed their emergency limits - c. A net increase of MW would go
out of your BAs system
, 12. According to the NERC Glossary, a constrained facility is defined as a
transmission facility that is approaching, is at, or is beyond its?
a. SOL or IROL
b. Normal voltage parameters
c. Available Transfer Capability
d. Economic operating point - a. SOL or IROL
13. How should a Transmission Operator that is affected by or contributing to
transmission SOL or IROL limit violations respond to the situation?
a. When time permits
b. In coordination with other impacted entities
c. Independent of all other parties
d. Only at the direction of the Reliability Coordinator - b. In coordination with
other impacted entities
14. If a transmission operator is experiencing a SOL or IROL violation, how long
does the entity have to correct the problem?
a. 10 minutes
b. 20 minutes
c. 30 minutes
d. 60 minutes - c. 30 minutes
15. If your system is experiencing high system loads, high system imports, and
transmission facilities loaded to 100%, which of the following situations would
make the situation worse?
a. Loss of a distribution station
b. An internal generator tripping
c. A bulk capacitor connecting to the system
d. A 500 kV transmission line returned to service - b. An internal generator
tripping
