PJM Transmission Exam Study UPDATED
ACTUAL Exam Questions and CORRECT
Answers
During System Restoration, what is the optimal Frequency Range? - CORRECT
ANSWER -59.75 - 61 Hz
The 500 kV system has normal bus voltages between? - CORRECT ANSWER -500 to 550
kV
When Connecting 2 islands, the operator must match? - CORRECT ANSWER -Voltage,
Phase Angle and Frequency
What are the Minimum Source Requirements for a 500kV line? (Gen/mile and load/mile) -
CORRECT ANSWER -30 MW Gen/mile of energized 500 kV and 20 MW Load/mile of
energized 500 kV
When will PJM issue a Minimum Generation Alert? (how many MW under normal operating
limits) - CORRECT ANSWER -When expected generation levels fall within 2500 MW of
normal operating limits
When a thunderstorm is nearing the BES should auto-reclosing be turned on? - CORRECT
ANSWER -Yes
What does SCADA stand for? - CORRECT ANSWER -Supervisory Control & Data
Acquisition
What does IROL stand for? - CORRECT ANSWER -Interconnection Reliability
Operating Limit
,What does eDART stand for? - CORRECT ANSWER -Dispatcher Application and
Reporting Tool
What is eDART used for? (Electronic Disp Reporting Tool) - CORRECT ANSWER -It is
used for: Generation Outage Scheduling, Instantaneous Reserve Checks, Generator Reactive
Capabilities and to enter and submit switching
What direction do VARS flow? - CORRECT ANSWER -From HIGH Voltage to LOW
Voltage
What direction do MW flow? - CORRECT ANSWER -From HIGH Phase Angle to LOW
Phase Angle
Which of the following factors are NOT used in forecasting load?
1) Weather Forecast
2) Historical Load Forecast
3) Historical Weather Data
4) Locational Marginal Pricing (LMP) Data - CORRECT ANSWER -4
What one-way communication system is used to disseminate info to local call centers? -
CORRECT ANSWER -All-Call
The 3 categories of messages issued by PJM All-Call all EXCEPT:
1) Operational
2) Informational
3) Conflicting Interchange Values
4) Emergency Procedures - CORRECT ANSWER -3
,When should, transmission outages should be submitted to PJM to avoid cancellation and to be
considered "on time?' - CORRECT ANSWER -First day of Month Prior to the Outage
What report will be requested by PJM when a Max Generation Alert is issued? - CORRECT
ANSWER -Supplementary Status Report (SSR)
The loss of a large generation unit on the PJM system can be detected by monitoring: -
CORRECT ANSWER -Frequency and PJM Area Control Error (ACE)
The PJM system is operated such that the contingency flow is less than the: - CORRECT
ANSWER -Emergency Rating
When ordered a 5% voltage reduction should be taken on: - CORRECT ANSWER -The
Distribution System
TOs are required to report "Hot Line Work" on what voltage levels? - CORRECT
ANSWER -345 kV and Above
Load dump rating of an EHV line is determined by? - CORRECT ANSWER -115% of the
facility's 4 hour Emergency Rating
During System Restoration, will closing additional tie lines increase the strength & stability of an
interconnected area? - CORRECT ANSWER -Yes
Which of the following factors influence load forecast (3)?
1) Weather
2) Temperature
3) Reactive Reserves
4) Day of the week - CORRECT ANSWER -1, 2, 4
, During system restoration, what is the voltage range the system should be kept between? -
CORRECT ANSWER -90% and 105% maintain voltage profile between for system
restoration
PJM will coordinate and direct all restoration lines of what voltage levels? - CORRECT
ANSWER -500kV and above
How much load would you dump to increase the frequency by 1 Hz (percentage range)? -
CORRECT ANSWER -6-10%
Generation is disconnected after 5 seconds, when the frequency: - CORRECT ANSWER -
Drops below 57.5Hz
How much of the total Dynamic Reserve should be used on Under Frequency relay load? -
CORRECT ANSWER -
During System Restoration, capacitor banks should be kept off until how much of the load is
restored? - CORRECT ANSWER -40%
Would PJM assume Frequency Control when the control of an interconnected area is too
burdensome for any Local Control Center? - CORRECT ANSWER -Yes
Operator receiving an All-Call message should state the following before playback of the
message? - CORRECT ANSWER -Name and Company
Dynamic Reserves consist of: - CORRECT ANSWER -Governor Reserve and Load that
has been restored with under frequency relays
What would be the appropriate response to receiving a DC ground Alarm? - CORRECT
ANSWER -Advise substation personnel of the alarm during normal hours
ACTUAL Exam Questions and CORRECT
Answers
During System Restoration, what is the optimal Frequency Range? - CORRECT
ANSWER -59.75 - 61 Hz
The 500 kV system has normal bus voltages between? - CORRECT ANSWER -500 to 550
kV
When Connecting 2 islands, the operator must match? - CORRECT ANSWER -Voltage,
Phase Angle and Frequency
What are the Minimum Source Requirements for a 500kV line? (Gen/mile and load/mile) -
CORRECT ANSWER -30 MW Gen/mile of energized 500 kV and 20 MW Load/mile of
energized 500 kV
When will PJM issue a Minimum Generation Alert? (how many MW under normal operating
limits) - CORRECT ANSWER -When expected generation levels fall within 2500 MW of
normal operating limits
When a thunderstorm is nearing the BES should auto-reclosing be turned on? - CORRECT
ANSWER -Yes
What does SCADA stand for? - CORRECT ANSWER -Supervisory Control & Data
Acquisition
What does IROL stand for? - CORRECT ANSWER -Interconnection Reliability
Operating Limit
,What does eDART stand for? - CORRECT ANSWER -Dispatcher Application and
Reporting Tool
What is eDART used for? (Electronic Disp Reporting Tool) - CORRECT ANSWER -It is
used for: Generation Outage Scheduling, Instantaneous Reserve Checks, Generator Reactive
Capabilities and to enter and submit switching
What direction do VARS flow? - CORRECT ANSWER -From HIGH Voltage to LOW
Voltage
What direction do MW flow? - CORRECT ANSWER -From HIGH Phase Angle to LOW
Phase Angle
Which of the following factors are NOT used in forecasting load?
1) Weather Forecast
2) Historical Load Forecast
3) Historical Weather Data
4) Locational Marginal Pricing (LMP) Data - CORRECT ANSWER -4
What one-way communication system is used to disseminate info to local call centers? -
CORRECT ANSWER -All-Call
The 3 categories of messages issued by PJM All-Call all EXCEPT:
1) Operational
2) Informational
3) Conflicting Interchange Values
4) Emergency Procedures - CORRECT ANSWER -3
,When should, transmission outages should be submitted to PJM to avoid cancellation and to be
considered "on time?' - CORRECT ANSWER -First day of Month Prior to the Outage
What report will be requested by PJM when a Max Generation Alert is issued? - CORRECT
ANSWER -Supplementary Status Report (SSR)
The loss of a large generation unit on the PJM system can be detected by monitoring: -
CORRECT ANSWER -Frequency and PJM Area Control Error (ACE)
The PJM system is operated such that the contingency flow is less than the: - CORRECT
ANSWER -Emergency Rating
When ordered a 5% voltage reduction should be taken on: - CORRECT ANSWER -The
Distribution System
TOs are required to report "Hot Line Work" on what voltage levels? - CORRECT
ANSWER -345 kV and Above
Load dump rating of an EHV line is determined by? - CORRECT ANSWER -115% of the
facility's 4 hour Emergency Rating
During System Restoration, will closing additional tie lines increase the strength & stability of an
interconnected area? - CORRECT ANSWER -Yes
Which of the following factors influence load forecast (3)?
1) Weather
2) Temperature
3) Reactive Reserves
4) Day of the week - CORRECT ANSWER -1, 2, 4
, During system restoration, what is the voltage range the system should be kept between? -
CORRECT ANSWER -90% and 105% maintain voltage profile between for system
restoration
PJM will coordinate and direct all restoration lines of what voltage levels? - CORRECT
ANSWER -500kV and above
How much load would you dump to increase the frequency by 1 Hz (percentage range)? -
CORRECT ANSWER -6-10%
Generation is disconnected after 5 seconds, when the frequency: - CORRECT ANSWER -
Drops below 57.5Hz
How much of the total Dynamic Reserve should be used on Under Frequency relay load? -
CORRECT ANSWER -
During System Restoration, capacitor banks should be kept off until how much of the load is
restored? - CORRECT ANSWER -40%
Would PJM assume Frequency Control when the control of an interconnected area is too
burdensome for any Local Control Center? - CORRECT ANSWER -Yes
Operator receiving an All-Call message should state the following before playback of the
message? - CORRECT ANSWER -Name and Company
Dynamic Reserves consist of: - CORRECT ANSWER -Governor Reserve and Load that
has been restored with under frequency relays
What would be the appropriate response to receiving a DC ground Alarm? - CORRECT
ANSWER -Advise substation personnel of the alarm during normal hours
