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PJM Transmission Exam Study Questions with Complete Solutions
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PJM Transmission Exam Study Questionswith Complete Solutions
During System Restoration, capacitor banks should be kept off until how much of the load is
restored? - ✔40%
Would PJM assume Frequency Control when the control of an interconnected area is
too burdensome for any Local Control Center? - ✔Yes
Operator receiving an All-Call message should state the following before playback of the
message? - ✔Name and Company
Dynamic Reserves consist of: - ✔Governor Reserve and Load that has been restored
with under frequency relays
What would be the appropriate response to receiving a DC ground Alarm? -
✔Advise substation personnel of the alarm during normal hours
An islanded system has a load of 3000 MW. To increase frequency by 1 Hz, how much
load should be shed? - ✔180 MW
Which of the following actions would be used FIRST to control a reactive transfer
limit violation?
a) Place reactors in service
,b) Load offcost (out of merit) generation
c) Issue load dump warning
d) Modify firm transaction schedules - ✔B
When available primary reserve capacity on a system is less than the largest operating
generator, or the loss of a transmission facility jeopardizes reliable operations, PJM should
issue a:
a) Manual load dump warning
b) Maximum emergency generation
c) Voltage reduction warning
d) Primary reserve alert - ✔A
Increased load on a circuit causes lower voltage at the remote end. Which of the following
will increase this voltage?
a) Switch off the distribution circuit capacitors
b) Raise the generation supply at the remote end
c) Raise the stepdown transformer tap position
d) Switch additional load to this circuit - ✔C
When synchronizing isolated areas, which of the following conditions must be met (3 choices to
pick)?
1. Similar frequency
2. Similar voltage
3. Matching load
4. Minimum phase angle difference - ✔1, 2, and 4 only
,A real time security analysis contingency or actual overload is
a) Immediately reported to NERC
b) Reported to operations planning
c) Bad data
d) Immediately communicated to the PJM transmission dispatcher - ✔D
A 1000 MW generating unit is located in an area with three transmission lines carrying power
from the generation source to the customer load. Each line has an emergency limit of 400 MW.
The maximum pre-contingency load that the generator should be allowed to load is:
a) 200 MW
b) 600 MW
c) 800 MW
d) 1000 MW - ✔C
Distribution factors are used to determine:
a) The distribution of voltage levels on key lines
b) The surge impedance loading of lines
c) The impact of placing capacitor banks in or out of service
d) How the flow of MW on a line will be redistributed upon its loss - ✔D
PJM has issued a heavy load voltage schedule. Which of the following is NOT an appropriate
PJM member action in response to this alert?
a) Ensure that all unit voltage regulators are in service
, b) Ensure that all unit voltage regulators are in manual mode
c) Ensure that all reactors are out of service and available capacitors are in service
d) Ensure that all units connected to the 500 kV system are operated so that reasonable
MVAR reserve is maintained - ✔B
Which of the following reasons describes why opening a pre-studied EHV line has a
positive effect in reducing system voltages?
1. Eliminates the capacitance charging of the line
2. Increases MW flow on other EHV lines, thereby reducing their MVAR output
3. Eliminates circulating VARs on transformers
4. Helps increase reactive import capability a) 1 and 2 only b) 1 and 3 only c) 2 and 4 only d)
3 and 4 only - ✔A
During system restoration, an island requires 400 MW of dynamic reserve. The maximum load
allowed with underfrequency relay protection enabled that can be counted as dynamic
reserve is:
a) 100 MW
b) 200 MW
c) 300 MW
d) 400 MW - ✔B
What is the surge impedance loading on a typical 500 kV line?
a) 230 MW
b) 500 MW
c) 750 MW
d) 850 MW - ✔D
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