NERC Test Questions with Answers Flashcards
(REVIEW DIAGRAM #1) voltage at Station A and B will decrease
If CB-5 is closed, which of the following best describes
the impact on the voltages at Stations A and B?
A. voltage at Station B will increase and the voltage at
Station A will decrease
B. voltage at Station A will increase and the voltage at
Station B will decrease
C. voltage at Station A and B will increase 3 multiple choice options
D. voltage at Station A and B will decrease
(REVIEW DIAGRAM #2) remove Bus 5 capacitor from service
If a high voltage condition exists on Bus 5, which of the
following actions would have the most impact toward
lowering the voltage on Bus 5?
A. reduce MVAR on GEN 3
B. remove Bus 5 capacitor from service
C. start GEN 4 to absorb MVAR
D. adjust the taps on the 230/138 transformer 3 multiple choice options
(REVIEW DIAGRAM #3) open the reactor bypass CB
If Line 3 in the identified system has a rating of 125 MW
and a current flow of 150 MW from Station B to Station
A, what action can be implemented that would result in a
reduction of the flow on Line 3?
A. decrease GEN 1 by 50 MW
B. open the reactor bypass CB
C. reduce load at Load 2 3 multiple choice options
D. disconnect Load 3
(REVIEW DIAGRAM #4) Line 4 would be de-energized from this station
Which of the following would be an impact on the ring
bus and lines?
A. Line 1 would be the only de-energized line from this
station
B. Line 4 would be de-energized from this station
1 multiple choice option
(REVIEW DIAGRAM #5) the flow on Line 2 would increase
Which of the following statements identifies what the
impacts would be if Line 1 trips out of service?
A. Generator 1 would reduce its output
B. the flow on Line 2 would increase
1 multiple choice option
(REVIEW DIAGRAM #6) reduce GEN 1 and increase GEN 3
If the MW loading on Line 1 is flowing from Bus 1 to Bus
4, which of the following generation adjustments would
have the greatest impact in reducing the Line 1 loading?
A. increase GEN 1 and reduce GEN 3
B. reduce GEN 1 and increase GEN 3
1 multiple choice option
(REVIEW DIAGRAM #7) 500 MW
Gen 1 is currently putting out 1,000 MW and Gen 2 is
offline. Based on the distribution factors, 40% of the
output flows on line 1 and 30% of the output flows on
each Line 2 and Line 3. If the LODF for the loss of line 1
are .5 for Line 2 and .5 for line 3, what would the new
flow be on Line 2 or Line 3 if Line 1 trips?
A. 300 MW 3 multiple choice options
B. 400 MW
C. 500 MW
D. 600 MW
, NERC Test Questions with Answers Flashcards
(REVIEW DIAGRAM #8) 31.6 Ω
What would the impedance be for the circuit that has an
AC voltage source and a resistance of 30 ohms,
inductive reactance of 80 ohms, and a capacitive
reactance of 70 ohms?
A. 11.4 Ω
B. 31.6 Ω
C. 73.2 Ω 3 multiple choice options
D. 152.9 Ω
(REVIEW DIAGRAM #9) increasing the MVAR output GEN 2
If there was a low voltage situation in the area of Bus 2,
which of the following actions would be the first action to
assist in increasing the voltage?
A. reducing load at LOAD 5
B. reducing MVAR output on GEN 3
C. reducing load at LOAD 4 3 multiple choice options
D. increasing the MVAR output GEN 2
(REVIEW DIAGRAM #10) 40 MW
Line 1, Line 2, and Line 3 all have identical impedances.
With Line 3 out of service, the flow from Station A to
Station B is 60 MW on Line 1 and 60 MW on Line 2, if
Line 3 is returned to service, what would be the MW
loading on Line 1?
A. 30 MW
B. 40 MW 3 multiple choice options
C. 60 MW
D. 120 MW
(REVIEW DIAGRAM #11) 80 MW
Generator 2 is currently putting out 100 MW and there is
100 MW coming into Station A from System Z. Line 1 has
a DF of .4, Line 2 has a DF of .3, and Line 3 has a DF of
.3. What would be the flow on line 1?
A. 40 MW
B. 60 MW 3 multiple choice options
C. 80 MW
D. 120 MW
(REVIEW DIAGRAM #12) 531 Ω
What would the impedance be for the circuit that has an
AC voltage source and a resistance of 40 ohms,
inductive reactance of 1.13 ohms, and a capacitive
reactance of 531 ohms?
A. 382 Ω
B. 465 Ω
C. 531 Ω 3 multiple choice options
D. 627 Ω
(REVIEW DIAGRAM #13) increase generation at "A" and reduce generation at "B"
If switch 352 is rated for 40 MVA and it is required to be
utilized in a planned switching activity, what action can
be implemented prior to switching to prevent exceeding
Switch 352's capability?
A. increase generation at "B" and reduce generation at
"A" 3 multiple choice options
B. increase generation at "A" and reduce generation at
"B"
C. increase load at Load 2
D. decrease load at Load 3
(REVIEW DIAGRAM #14) 50
Generator 2 is currently putting out 100 MW. There is 0
MW coming from System Z. The MW flow on the lines is
as follows: Line 1 has 50 MW from A to B, Line two has
25 MW from A to B, and Line 3 has 25 MW from A to B. If
100 MW were to flow in from System Z, what would be
the new MW flow on Line 3?
A. 50 3 multiple choice options
B. 100
C. 25
D. 150
, NERC Test Questions with Answers Flashcards
(REVIEW DIAGRAM #15) the flow on Line 3 and Line 5 would increase
Which of the following statements identifies what the
impacts would be if Line 4 trips out of service?
A. Generator 1 would reduce its output
B. the flow on Line 2 would increase
C. the flow on Line 3 and Line 5 would increase
D. the flow on Line 1 and Line 2 would decrease
3 multiple choice options
(REVIEW MAP #16) geo-magnetic disturbances
Rock formations identified on the North American map
would tend to be the areas where equipment would be
most impacted as a result of which of the following?
A. geo-magnetic disturbances
B. ground fault disturbances
C. inclement weather
D. earthquakes 3 multiple choice options
(REVIEW DIAGRAM #17) 60 MW
Generator 2 is currently putting out 100 MW and there is
a 100 MW coming into Station A from System Z. Line 1
has a DF of .4, Line 2 has a DF of .3, and Line 3 has a
DF of .3. What would be the flow on line 3?
A. 40 MW
B. 60 MW
C. 80 MW 3 multiple choice options
D. 120 MW
(REVIEW DIAGRAM #18) 13 MVA
Based on the loads provided and the power flow, what
will be the power flow across switches 101 and 320?
A. 13 MVA
B. 55 MVA
C. 82 MVA
D. 85 MVA
3 multiple choice options
(REVIEW DIAGRAM #19) 100 MW
Generator 2 is currently putting out 100 MW. There is 0
MW coming from System Z. The MW flow on the lines is
as follows: Line 1 has 50 MW from A to B, Line two has
25 MW from A to B, and Line 3 has 25 MW from A to B. If
100 MW were to flow in from System Z, what would be
the new MW flow on Line 1?
A. 50 MW 3 multiple choice options
B. 75 MW
C. 100 MW
D. 125 MW
(REVIEW PHOTO #20) increased heating in transformers
What would the System Operator expect to see on the
power system if the following occurred?
A. increased output from shunt capacitors
B. reduction in power system spinning reserves
C. increased heating in transformers
D. disabling of zone three relays
3 multiple choice options
(REVIEW DIAGRAM #21) 398 MW
What would the loading be on line A-B if the following
generation adjustments were implemented?
1. Unit #1 decreased output by 100 MW
2. Unit #2 increased output by 50 MW
3. Unit #3 increased output by 50 MW
A. 425 MW
B. 398 MW 3 multiple choice options
C. 376 MW
D. 456 MW
, NERC Test Questions with Answers Flashcards
(REVIEW DIAGRAM #22) weather provided less humidity than forecasted
The forecasted load is represented with the blue curve
and the actual load is represented by the red curve.
What would be a logical reason for the difference?
A. weather provided more heat than was forecasted
B. weather provided less humidity than forecasted
C. actual load was higher than projected
D. actual load was lower than projected 3 multiple choice options
(REVIEW DIAGRAM #23) reduce LOAD 5
Which of the following actions would assist in reducing
the loading on line 3, if the flow is from Bus 2 to Bus 6?
A. reduce LOAD 5
B. reduce MVAR output on GEN 3
C. reduce LOAD 4
D. increase MVAR output on GEN 2
3 multiple choice options
(REVIEW DIAGRAM #24) 48 MVA
Based on the loads provided and the power flow, what
will be the power flow across switch 352?
A. 82 MVA
B. 61 MVA
C. 48 MVA
D. 21 MVA
3 multiple choice options
(REVIEW DIAGRAM #25) Line 1 = .50, Line 2 = .25, Line 3 = .25
Generator 2 is currently putting out 100 MW. There is 0
MW coming from System Z. The MW flow on the lines is
as follows: Line 1 has 50 MW from A to B, Line two has
25 MW from A to B, and Line 3 has 25 MW from A to B.
What are the distribution factors for each of the lines?
A. Line 1 = 1.00, Line 2 = .50, Line 3 = .50
B. Line 1 =.75, Line 2 = .375, Line 3 = .375 3 multiple choice options
C. Line 1 = .50, Line 2 = .25, Line 3 = .25
D. Line 1 = .25, Line 2 = .125, Line 3 = .125
(REVIEW DIAGRAM #26) MW flow would be less than 485 MW
There is currently 485 MW flowing from Station A to
Station B, what would be the impact on the line flow from
Station A to B if breakers CB-2 and CB-3 are closed and
breaker CB-1 is opened?
A. MW flow would be more than 485 MW
B. MW flow would be less than 485 MW
C. MW flow would remain at 485 MW 3 multiple choice options
D. MW would stop flowing altogether
(REVIEW DIAGRAM #27) 190 Ω
What would the impedance be for the circuit that has an
AC voltage source and a resistance of 40 ohms,
inductive reactance of 188 ohms, and a capacitive
reactance of 3.18 ohms?
A. 195 Ω
B. 190 Ω
C. 185 Ω 3 multiple choice options
D. 180 Ω
(REVIEW DIAGRAM #28) 580 MW and 420 MW
Gen 1 is currently putting out 1000 MW and Gen 2 is
offline. Based on the distribution factors, 40% of the
output flows on line 1 and 30% of the output flows on
each Line 2 and Line 3. If the LODF (line outage
distribution factors) for the loss of line 3 are .6 for Line 1
and .4 for line 2, what would the new flow be on Line 1
and Line 2 if Line 3 trips? 3 multiple choice options
A. 580 MW and 420 MW
B. 620 MW and 380 MW
C. 560 MW and 440 MW
D. 575 MW and 425 MW
(REVIEW DIAGRAM #1) voltage at Station A and B will decrease
If CB-5 is closed, which of the following best describes
the impact on the voltages at Stations A and B?
A. voltage at Station B will increase and the voltage at
Station A will decrease
B. voltage at Station A will increase and the voltage at
Station B will decrease
C. voltage at Station A and B will increase 3 multiple choice options
D. voltage at Station A and B will decrease
(REVIEW DIAGRAM #2) remove Bus 5 capacitor from service
If a high voltage condition exists on Bus 5, which of the
following actions would have the most impact toward
lowering the voltage on Bus 5?
A. reduce MVAR on GEN 3
B. remove Bus 5 capacitor from service
C. start GEN 4 to absorb MVAR
D. adjust the taps on the 230/138 transformer 3 multiple choice options
(REVIEW DIAGRAM #3) open the reactor bypass CB
If Line 3 in the identified system has a rating of 125 MW
and a current flow of 150 MW from Station B to Station
A, what action can be implemented that would result in a
reduction of the flow on Line 3?
A. decrease GEN 1 by 50 MW
B. open the reactor bypass CB
C. reduce load at Load 2 3 multiple choice options
D. disconnect Load 3
(REVIEW DIAGRAM #4) Line 4 would be de-energized from this station
Which of the following would be an impact on the ring
bus and lines?
A. Line 1 would be the only de-energized line from this
station
B. Line 4 would be de-energized from this station
1 multiple choice option
(REVIEW DIAGRAM #5) the flow on Line 2 would increase
Which of the following statements identifies what the
impacts would be if Line 1 trips out of service?
A. Generator 1 would reduce its output
B. the flow on Line 2 would increase
1 multiple choice option
(REVIEW DIAGRAM #6) reduce GEN 1 and increase GEN 3
If the MW loading on Line 1 is flowing from Bus 1 to Bus
4, which of the following generation adjustments would
have the greatest impact in reducing the Line 1 loading?
A. increase GEN 1 and reduce GEN 3
B. reduce GEN 1 and increase GEN 3
1 multiple choice option
(REVIEW DIAGRAM #7) 500 MW
Gen 1 is currently putting out 1,000 MW and Gen 2 is
offline. Based on the distribution factors, 40% of the
output flows on line 1 and 30% of the output flows on
each Line 2 and Line 3. If the LODF for the loss of line 1
are .5 for Line 2 and .5 for line 3, what would the new
flow be on Line 2 or Line 3 if Line 1 trips?
A. 300 MW 3 multiple choice options
B. 400 MW
C. 500 MW
D. 600 MW
, NERC Test Questions with Answers Flashcards
(REVIEW DIAGRAM #8) 31.6 Ω
What would the impedance be for the circuit that has an
AC voltage source and a resistance of 30 ohms,
inductive reactance of 80 ohms, and a capacitive
reactance of 70 ohms?
A. 11.4 Ω
B. 31.6 Ω
C. 73.2 Ω 3 multiple choice options
D. 152.9 Ω
(REVIEW DIAGRAM #9) increasing the MVAR output GEN 2
If there was a low voltage situation in the area of Bus 2,
which of the following actions would be the first action to
assist in increasing the voltage?
A. reducing load at LOAD 5
B. reducing MVAR output on GEN 3
C. reducing load at LOAD 4 3 multiple choice options
D. increasing the MVAR output GEN 2
(REVIEW DIAGRAM #10) 40 MW
Line 1, Line 2, and Line 3 all have identical impedances.
With Line 3 out of service, the flow from Station A to
Station B is 60 MW on Line 1 and 60 MW on Line 2, if
Line 3 is returned to service, what would be the MW
loading on Line 1?
A. 30 MW
B. 40 MW 3 multiple choice options
C. 60 MW
D. 120 MW
(REVIEW DIAGRAM #11) 80 MW
Generator 2 is currently putting out 100 MW and there is
100 MW coming into Station A from System Z. Line 1 has
a DF of .4, Line 2 has a DF of .3, and Line 3 has a DF of
.3. What would be the flow on line 1?
A. 40 MW
B. 60 MW 3 multiple choice options
C. 80 MW
D. 120 MW
(REVIEW DIAGRAM #12) 531 Ω
What would the impedance be for the circuit that has an
AC voltage source and a resistance of 40 ohms,
inductive reactance of 1.13 ohms, and a capacitive
reactance of 531 ohms?
A. 382 Ω
B. 465 Ω
C. 531 Ω 3 multiple choice options
D. 627 Ω
(REVIEW DIAGRAM #13) increase generation at "A" and reduce generation at "B"
If switch 352 is rated for 40 MVA and it is required to be
utilized in a planned switching activity, what action can
be implemented prior to switching to prevent exceeding
Switch 352's capability?
A. increase generation at "B" and reduce generation at
"A" 3 multiple choice options
B. increase generation at "A" and reduce generation at
"B"
C. increase load at Load 2
D. decrease load at Load 3
(REVIEW DIAGRAM #14) 50
Generator 2 is currently putting out 100 MW. There is 0
MW coming from System Z. The MW flow on the lines is
as follows: Line 1 has 50 MW from A to B, Line two has
25 MW from A to B, and Line 3 has 25 MW from A to B. If
100 MW were to flow in from System Z, what would be
the new MW flow on Line 3?
A. 50 3 multiple choice options
B. 100
C. 25
D. 150
, NERC Test Questions with Answers Flashcards
(REVIEW DIAGRAM #15) the flow on Line 3 and Line 5 would increase
Which of the following statements identifies what the
impacts would be if Line 4 trips out of service?
A. Generator 1 would reduce its output
B. the flow on Line 2 would increase
C. the flow on Line 3 and Line 5 would increase
D. the flow on Line 1 and Line 2 would decrease
3 multiple choice options
(REVIEW MAP #16) geo-magnetic disturbances
Rock formations identified on the North American map
would tend to be the areas where equipment would be
most impacted as a result of which of the following?
A. geo-magnetic disturbances
B. ground fault disturbances
C. inclement weather
D. earthquakes 3 multiple choice options
(REVIEW DIAGRAM #17) 60 MW
Generator 2 is currently putting out 100 MW and there is
a 100 MW coming into Station A from System Z. Line 1
has a DF of .4, Line 2 has a DF of .3, and Line 3 has a
DF of .3. What would be the flow on line 3?
A. 40 MW
B. 60 MW
C. 80 MW 3 multiple choice options
D. 120 MW
(REVIEW DIAGRAM #18) 13 MVA
Based on the loads provided and the power flow, what
will be the power flow across switches 101 and 320?
A. 13 MVA
B. 55 MVA
C. 82 MVA
D. 85 MVA
3 multiple choice options
(REVIEW DIAGRAM #19) 100 MW
Generator 2 is currently putting out 100 MW. There is 0
MW coming from System Z. The MW flow on the lines is
as follows: Line 1 has 50 MW from A to B, Line two has
25 MW from A to B, and Line 3 has 25 MW from A to B. If
100 MW were to flow in from System Z, what would be
the new MW flow on Line 1?
A. 50 MW 3 multiple choice options
B. 75 MW
C. 100 MW
D. 125 MW
(REVIEW PHOTO #20) increased heating in transformers
What would the System Operator expect to see on the
power system if the following occurred?
A. increased output from shunt capacitors
B. reduction in power system spinning reserves
C. increased heating in transformers
D. disabling of zone three relays
3 multiple choice options
(REVIEW DIAGRAM #21) 398 MW
What would the loading be on line A-B if the following
generation adjustments were implemented?
1. Unit #1 decreased output by 100 MW
2. Unit #2 increased output by 50 MW
3. Unit #3 increased output by 50 MW
A. 425 MW
B. 398 MW 3 multiple choice options
C. 376 MW
D. 456 MW
, NERC Test Questions with Answers Flashcards
(REVIEW DIAGRAM #22) weather provided less humidity than forecasted
The forecasted load is represented with the blue curve
and the actual load is represented by the red curve.
What would be a logical reason for the difference?
A. weather provided more heat than was forecasted
B. weather provided less humidity than forecasted
C. actual load was higher than projected
D. actual load was lower than projected 3 multiple choice options
(REVIEW DIAGRAM #23) reduce LOAD 5
Which of the following actions would assist in reducing
the loading on line 3, if the flow is from Bus 2 to Bus 6?
A. reduce LOAD 5
B. reduce MVAR output on GEN 3
C. reduce LOAD 4
D. increase MVAR output on GEN 2
3 multiple choice options
(REVIEW DIAGRAM #24) 48 MVA
Based on the loads provided and the power flow, what
will be the power flow across switch 352?
A. 82 MVA
B. 61 MVA
C. 48 MVA
D. 21 MVA
3 multiple choice options
(REVIEW DIAGRAM #25) Line 1 = .50, Line 2 = .25, Line 3 = .25
Generator 2 is currently putting out 100 MW. There is 0
MW coming from System Z. The MW flow on the lines is
as follows: Line 1 has 50 MW from A to B, Line two has
25 MW from A to B, and Line 3 has 25 MW from A to B.
What are the distribution factors for each of the lines?
A. Line 1 = 1.00, Line 2 = .50, Line 3 = .50
B. Line 1 =.75, Line 2 = .375, Line 3 = .375 3 multiple choice options
C. Line 1 = .50, Line 2 = .25, Line 3 = .25
D. Line 1 = .25, Line 2 = .125, Line 3 = .125
(REVIEW DIAGRAM #26) MW flow would be less than 485 MW
There is currently 485 MW flowing from Station A to
Station B, what would be the impact on the line flow from
Station A to B if breakers CB-2 and CB-3 are closed and
breaker CB-1 is opened?
A. MW flow would be more than 485 MW
B. MW flow would be less than 485 MW
C. MW flow would remain at 485 MW 3 multiple choice options
D. MW would stop flowing altogether
(REVIEW DIAGRAM #27) 190 Ω
What would the impedance be for the circuit that has an
AC voltage source and a resistance of 40 ohms,
inductive reactance of 188 ohms, and a capacitive
reactance of 3.18 ohms?
A. 195 Ω
B. 190 Ω
C. 185 Ω 3 multiple choice options
D. 180 Ω
(REVIEW DIAGRAM #28) 580 MW and 420 MW
Gen 1 is currently putting out 1000 MW and Gen 2 is
offline. Based on the distribution factors, 40% of the
output flows on line 1 and 30% of the output flows on
each Line 2 and Line 3. If the LODF (line outage
distribution factors) for the loss of line 3 are .6 for Line 1
and .4 for line 2, what would the new flow be on Line 1
and Line 2 if Line 3 trips? 3 multiple choice options
A. 580 MW and 420 MW
B. 620 MW and 380 MW
C. 560 MW and 440 MW
D. 575 MW and 425 MW
