PJM Transmission Exam Study 2025
Questions and 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
....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 1
,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
....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 2
,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
....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 3
, 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
....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 4
Questions and 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
....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 1
,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
....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 2
,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
....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 3
, 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
....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 4
