NERC
PRACTICE EXAM QUESTIONS
WITH CORRECT DETAILED
ANSWERS | ALREADY GRADED
A+<RECENT VERSION>
1. How much load reduction to change frequency - answer 6-10% Load
reduction = 1HZ Frequency change same direction
2. Largest Load block to pick up during sys resto - answer 5% of online
generation
3. Ratio of Voltage change to load change - answer 5% change in
Voltage=3% change in load (distribution only)
4. Power Losses on Line - answer I squared * R
5. DOE Reporting Conditions - answer 300 MW uncontrolled loss of
load
100MW Firm load shed
50,000 customers out of power greater than 1 hr
3% Voltage reduction
Public appeals to reduce load
vandalism, sabotage
,6. Time requirements for DOT reporting - answer 60 minutes for initial
report
48 hrs for followup report
7. NERC reporting time requirements - answer 24 hrs normal 72 hrs
IROL violoation for intial
60 Days final report
8. How often must a blackstart gen be tested - answer every 5 years
9. How often must a sys resto plan be reviewed/updated - answer every 1
year
10.How often must sys resto plan be tested - answer every 3 years (really
not sure about this one)
11.Who is responsible for creating a sys resto plan - answer TOP
12.how often is ACE calculated - answer every 6 seconds (have seen 4)
13.ratio of frequency change to load change - answer 1% change in
frequency = 2% change in load (approx. depending on reactive nature of
load)
14.transmission voltages - answer 765, 500, 345,230,138, 115 kv
15.distribution voltages - answer 240, 120, 4, 13, 26, 69 kv
,16.how long does a gen have to restart after shutdown without full restart
process - answer 30 minutes
17.allowable voltage variation during sys restoration - answer +/- 10%
18.allowable voltage variation during normal condtions - answer +/- 5%
19.allowable frequency variation during system resto - answer 59.75 hz -
61 hz (also saw 59.5 hz)
20.power transfer - answer ((V1*V2)*sin power angle)/Xsubl
21.What voltage is considered part of the BES - answer 100 kV or higher
22.Number of required emergency ops training hours for sys operators -
answer 32 hrs
23.Formula for redispatching generation (only for balancing) - answer
MW relief required/(GDF GenA-GDF GenB)=change in GenB output
24.Minimum Torque angle for power to start flowing - answer 10 degrees
25.Minimum Frequncy Bias setting for BA - answer 1% of estimated
peak demand for next year or 1% of estimated peak generation for next
year if not load serving
26.CPS1 requirement - answer greater than or equal to 100% for rolling
12 month period
, 27.CPS 2 requirement - answer greater than or equal to 90% for month
(10 minute intervals)
28.What level of disturbance is reportable for DCS - answer 80% of
MSST
29.DCS requirement to return to pre disturbance condition - answer 15
minutes
30.DCS requirement for recovery period - answer 90 minutes after the
end of disturbance period
31.time error correction - answer 1) +/- .02 hz to Fs
2) 20% of B added to NIs if unable to perform frequency adjustment
32.amount of interchange transaction intermediate BAs receive for losses -
answer 3% of transaction
33.how long does BA have to submit emergency RFI - answer 60
minutes
34.length of time deficient BA can use assistance from reserve sharing group
before must sumbit RFI - answer 60 minutes
35.time Interchange Authority has to distribute arranged interchange -
answer 1 minute
PRACTICE EXAM QUESTIONS
WITH CORRECT DETAILED
ANSWERS | ALREADY GRADED
A+<RECENT VERSION>
1. How much load reduction to change frequency - answer 6-10% Load
reduction = 1HZ Frequency change same direction
2. Largest Load block to pick up during sys resto - answer 5% of online
generation
3. Ratio of Voltage change to load change - answer 5% change in
Voltage=3% change in load (distribution only)
4. Power Losses on Line - answer I squared * R
5. DOE Reporting Conditions - answer 300 MW uncontrolled loss of
load
100MW Firm load shed
50,000 customers out of power greater than 1 hr
3% Voltage reduction
Public appeals to reduce load
vandalism, sabotage
,6. Time requirements for DOT reporting - answer 60 minutes for initial
report
48 hrs for followup report
7. NERC reporting time requirements - answer 24 hrs normal 72 hrs
IROL violoation for intial
60 Days final report
8. How often must a blackstart gen be tested - answer every 5 years
9. How often must a sys resto plan be reviewed/updated - answer every 1
year
10.How often must sys resto plan be tested - answer every 3 years (really
not sure about this one)
11.Who is responsible for creating a sys resto plan - answer TOP
12.how often is ACE calculated - answer every 6 seconds (have seen 4)
13.ratio of frequency change to load change - answer 1% change in
frequency = 2% change in load (approx. depending on reactive nature of
load)
14.transmission voltages - answer 765, 500, 345,230,138, 115 kv
15.distribution voltages - answer 240, 120, 4, 13, 26, 69 kv
,16.how long does a gen have to restart after shutdown without full restart
process - answer 30 minutes
17.allowable voltage variation during sys restoration - answer +/- 10%
18.allowable voltage variation during normal condtions - answer +/- 5%
19.allowable frequency variation during system resto - answer 59.75 hz -
61 hz (also saw 59.5 hz)
20.power transfer - answer ((V1*V2)*sin power angle)/Xsubl
21.What voltage is considered part of the BES - answer 100 kV or higher
22.Number of required emergency ops training hours for sys operators -
answer 32 hrs
23.Formula for redispatching generation (only for balancing) - answer
MW relief required/(GDF GenA-GDF GenB)=change in GenB output
24.Minimum Torque angle for power to start flowing - answer 10 degrees
25.Minimum Frequncy Bias setting for BA - answer 1% of estimated
peak demand for next year or 1% of estimated peak generation for next
year if not load serving
26.CPS1 requirement - answer greater than or equal to 100% for rolling
12 month period
, 27.CPS 2 requirement - answer greater than or equal to 90% for month
(10 minute intervals)
28.What level of disturbance is reportable for DCS - answer 80% of
MSST
29.DCS requirement to return to pre disturbance condition - answer 15
minutes
30.DCS requirement for recovery period - answer 90 minutes after the
end of disturbance period
31.time error correction - answer 1) +/- .02 hz to Fs
2) 20% of B added to NIs if unable to perform frequency adjustment
32.amount of interchange transaction intermediate BAs receive for losses -
answer 3% of transaction
33.how long does BA have to submit emergency RFI - answer 60
minutes
34.length of time deficient BA can use assistance from reserve sharing group
before must sumbit RFI - answer 60 minutes
35.time Interchange Authority has to distribute arranged interchange -
answer 1 minute
