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Exam (elaborations)

PJM SAMPLE TO QUESTIONS AND VERIFIED ANSWERS

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PJM SAMPLE TO QUESTIONS AND VERIFIED ANSWERS

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An EHV line is loaded above its SIL (surge impedence loading). This line can be
considered:
a) A VAR source
b) A VAR load
c) A contingency violation
d) Over its STE (short term emergency rating)


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b) A VAR load




In cases where a data point ID fails for an extended period of time, the system
operator will manually update the value:
a) Every 15 minutes
b) Every 30 minutes
c) Every hour
d) Every 4 hours

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b) Every 30 minutes




The PJM system is operated such that the contingency flow is less than the:
a) Warning rating
b) Emergency rating
c) Load dump rating
d) Normal continuous rating


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b) Emergency rating




When synchronizing isolated areas, which of the following conditions must be met?
1. Similar frequency
2. Similar voltage
3. Matching load
4. Minimum phase angle difference
a) 1, 2, and 3 only
b) 1, 2, and 4 only
c) 1, 3, and 4 only
d) 2, 3, and 4 only


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b) 1, 2, and 4 only

, What is the minimum connected load that should be carried per mile of energized
500KV line during restoration?
A. 10MW
B. 15MW
C. 20MW
D. 25MW


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C. 20MW




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


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b) 200 MW




During the system restoration process, PJM can be expected to assume frequency
control when:
a) All local control centers are interconnected
b) Two local control centers are interconnected
c) Three local control centers are interconnected
d) The control of an interconnected area is too burdensome for any one local control
center

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