NERC PRACTICE EXAM NEWEST ACTUAL EXAM
COMPLETE 240 QUESTIONS WITH DETAILED VERIFIED
ANSWERS (100% CORRECT ANSWERS) / NERC
CERTIFICATION PRACTICE UPDATED VERSION ACTUAL
EXAM /ALREADY GRADED A+
A simple power system is composed of three lines connecting generation to load.
Each lines the same impedance, is initially loaded at 200 MW, and has a thermal
limit of 400 MW. If one line trips, what the loading on the shortest remaining line
be and will the thermal limit either remaining line be violated? - CORRECT
ANSWER ✔✔- 300 MW and No
The best prediction of system load is the load forecast tool that uses? - CORRECT
ANSWER ✔✔- Forecasted Weather
If the phase angel at an open breaker is equal to 1/10 of a cycle, this is the the
same angle as? - CORRECT ANSWER ✔✔- 1/10 of 360 so 36
A ___________ tool is used to ensure the power system can respond within
acceptable limits of N-1 - CORRECT ANSWER ✔✔- Contingency Analysis
Which of the following activities would not be included in the procedures for
transmission reliability? - CORRECT ANSWER ✔✔- Ancillary service pricing
1|Page
,The transmission Operator and BA shall provide documentation that operating
personnel have ______ to implement real time actions to ensure the stable and
reliable operation of the BES. - CORRECT ANSWER ✔✔- Proper NERC Certification
Credential
A utility distribution bus has the following customer loads attached. What is the
total customer MW load and is the total customer load capacitive or inductive? 5
MW 1 MVAR & 3 MW 1 MVAR & 2 MW -2 MVAR & 10 MW 3 MVAR - CORRECT
ANSWER ✔✔- 20 mw and Inductive
How many MVARs does a 230 kV, 50 MVAR capacitor bank provide when the
voltage id 207 kV - CORRECT ANSWER ✔✔- Actual MW/ Rated MW ^2 x Capacitor
Rating
40
You are a system operator and the load forecast is for an all time summer peak
load day, generations and reactive resources will be tight. Which scheduled job
would you allow to proceed? - CORRECT ANSWER ✔✔- 735 kV shunt reactor
maintenance.
A contingency results in the exceedance of an IROL. What could be the result if
the IROL is allowed to be exceeded longer than T sub v - CORRECT ANSWER ✔✔-
Interruption of power to a large part of the BES
Generators have the ability to be used as voltage control devices. If a generator
raises its VAR output, the system orator should expect system stage to? -
CORRECT ANSWER ✔✔- Increase
2|Page
,The actual voltage is 362kV on a 345 bus. What is the p.u. voltage? - CORRECT
ANSWER ✔✔- 1.05
In the initial stages of a system restoration condition high transmission system
voltage problems are more likely than low transmission system voltage problems
why? - CORRECT ANSWER ✔✔- Because of excessive MVAR supply from the
energization of transmission lines
All transmission operators shall operate so that instability uncontrolled separation
or cascading outages will not occur in result of? - CORRECT ANSWER ✔✔- Most
severe single contingency MSSC
A 230kV transmission line is energized at 230kV and is 100 miles long. What is the
approximate line charging contribution? - CORRECT ANSWER ✔✔- 30MVAR
When the system is on the verge of a voltage collapse and nothing else can be
done to alleviate the problem, operating personnel should? - CORRECT ANSWER
✔✔- Shed Load
The transmission operator shall take corrective actions necessary to prevent
voltage collapse when reactive resources are insufficient including? - CORRECT
ANSWER ✔✔- Shedding Load
There is a SPS/RAS system out of service for maintenance in your BA. What
actions do you take? - CORRECT ANSWER ✔✔- Operate within system limits that
the SPS/RAS is designed to protect against
3|Page
, If a BA has 500 MW of spinning Reserves and of that 300 MW are Regulating
Reserves by definition NERC requires the Regulating Reserves must be? -
CORRECT ANSWER ✔✔- On line and AGC responsive
What is the approximate MVAR/Mile production for a 345kV line? - CORRECT
ANSWER ✔✔- 3/4
The MSSC for your BA Area is 850 MW. A defined disturbance for DCS reporting
would be qual to how many MWs? - CORRECT ANSWER ✔✔- 680
Of the following which would be the best indicator of voltage collapse prone
conditions? - CORRECT ANSWER ✔✔- Low reactive power reserves
If the phase angle add an open breaker is equal to 1/10 of a cycle this is the same
as an angle of _____________degrees - CORRECT ANSWER ✔✔- 36
A__________Tool is used to ensure the power system can respond within
acceptable limits N-1conditions? - CORRECT ANSWER ✔✔- Contingency analysis
A transmission line is operating with a voltage phase angle different of 30 degrees
between the sending Vs and the receiving bus Vr. If the receiving end load is
suddenly increased, the voltage phase angle difference will be? - CORRECT
ANSWER ✔✔- The phase angle will increase. When load is increased phase angle
will increase.
A load has a power factor of 0.9 lagging. If the load draws 100 MVA, what is the
MW draw? - CORRECT ANSWER ✔✔- 90 pf= mw/mva
4|Page
COMPLETE 240 QUESTIONS WITH DETAILED VERIFIED
ANSWERS (100% CORRECT ANSWERS) / NERC
CERTIFICATION PRACTICE UPDATED VERSION ACTUAL
EXAM /ALREADY GRADED A+
A simple power system is composed of three lines connecting generation to load.
Each lines the same impedance, is initially loaded at 200 MW, and has a thermal
limit of 400 MW. If one line trips, what the loading on the shortest remaining line
be and will the thermal limit either remaining line be violated? - CORRECT
ANSWER ✔✔- 300 MW and No
The best prediction of system load is the load forecast tool that uses? - CORRECT
ANSWER ✔✔- Forecasted Weather
If the phase angel at an open breaker is equal to 1/10 of a cycle, this is the the
same angle as? - CORRECT ANSWER ✔✔- 1/10 of 360 so 36
A ___________ tool is used to ensure the power system can respond within
acceptable limits of N-1 - CORRECT ANSWER ✔✔- Contingency Analysis
Which of the following activities would not be included in the procedures for
transmission reliability? - CORRECT ANSWER ✔✔- Ancillary service pricing
1|Page
,The transmission Operator and BA shall provide documentation that operating
personnel have ______ to implement real time actions to ensure the stable and
reliable operation of the BES. - CORRECT ANSWER ✔✔- Proper NERC Certification
Credential
A utility distribution bus has the following customer loads attached. What is the
total customer MW load and is the total customer load capacitive or inductive? 5
MW 1 MVAR & 3 MW 1 MVAR & 2 MW -2 MVAR & 10 MW 3 MVAR - CORRECT
ANSWER ✔✔- 20 mw and Inductive
How many MVARs does a 230 kV, 50 MVAR capacitor bank provide when the
voltage id 207 kV - CORRECT ANSWER ✔✔- Actual MW/ Rated MW ^2 x Capacitor
Rating
40
You are a system operator and the load forecast is for an all time summer peak
load day, generations and reactive resources will be tight. Which scheduled job
would you allow to proceed? - CORRECT ANSWER ✔✔- 735 kV shunt reactor
maintenance.
A contingency results in the exceedance of an IROL. What could be the result if
the IROL is allowed to be exceeded longer than T sub v - CORRECT ANSWER ✔✔-
Interruption of power to a large part of the BES
Generators have the ability to be used as voltage control devices. If a generator
raises its VAR output, the system orator should expect system stage to? -
CORRECT ANSWER ✔✔- Increase
2|Page
,The actual voltage is 362kV on a 345 bus. What is the p.u. voltage? - CORRECT
ANSWER ✔✔- 1.05
In the initial stages of a system restoration condition high transmission system
voltage problems are more likely than low transmission system voltage problems
why? - CORRECT ANSWER ✔✔- Because of excessive MVAR supply from the
energization of transmission lines
All transmission operators shall operate so that instability uncontrolled separation
or cascading outages will not occur in result of? - CORRECT ANSWER ✔✔- Most
severe single contingency MSSC
A 230kV transmission line is energized at 230kV and is 100 miles long. What is the
approximate line charging contribution? - CORRECT ANSWER ✔✔- 30MVAR
When the system is on the verge of a voltage collapse and nothing else can be
done to alleviate the problem, operating personnel should? - CORRECT ANSWER
✔✔- Shed Load
The transmission operator shall take corrective actions necessary to prevent
voltage collapse when reactive resources are insufficient including? - CORRECT
ANSWER ✔✔- Shedding Load
There is a SPS/RAS system out of service for maintenance in your BA. What
actions do you take? - CORRECT ANSWER ✔✔- Operate within system limits that
the SPS/RAS is designed to protect against
3|Page
, If a BA has 500 MW of spinning Reserves and of that 300 MW are Regulating
Reserves by definition NERC requires the Regulating Reserves must be? -
CORRECT ANSWER ✔✔- On line and AGC responsive
What is the approximate MVAR/Mile production for a 345kV line? - CORRECT
ANSWER ✔✔- 3/4
The MSSC for your BA Area is 850 MW. A defined disturbance for DCS reporting
would be qual to how many MWs? - CORRECT ANSWER ✔✔- 680
Of the following which would be the best indicator of voltage collapse prone
conditions? - CORRECT ANSWER ✔✔- Low reactive power reserves
If the phase angle add an open breaker is equal to 1/10 of a cycle this is the same
as an angle of _____________degrees - CORRECT ANSWER ✔✔- 36
A__________Tool is used to ensure the power system can respond within
acceptable limits N-1conditions? - CORRECT ANSWER ✔✔- Contingency analysis
A transmission line is operating with a voltage phase angle different of 30 degrees
between the sending Vs and the receiving bus Vr. If the receiving end load is
suddenly increased, the voltage phase angle difference will be? - CORRECT
ANSWER ✔✔- The phase angle will increase. When load is increased phase angle
will increase.
A load has a power factor of 0.9 lagging. If the load draws 100 MVA, what is the
MW draw? - CORRECT ANSWER ✔✔- 90 pf= mw/mva
4|Page
