Page 1 of 93
NERC Certification Preparation Exam 300
QUESTIONS AND CORRECT ANSWERS LATEST
UPDATE THIS YEAR NEW!!
1. Inadvertent interchange accumulations that are paid back by controlling to a target of non-
zero ACE and is limited by the BA's L10 is known as ________.
a. bilateral payback
b. selective payback
c. transmission payback
d. unilateral payback
d. unilateral payback
2. What is the purpose in account for Inadvertent Interchange amon=g the BA?
a. To maintain adequate reliability of energy transactions across each Interconnection.
b. To ensure that BA do not excessively depend on other BA areas for meeting their
Interchange obligations.
c. To compensate those orgs that take on the responsibility of operating a BA.
d. So that large energy providers can demonstrate the profitability of owning and operating
generation and transmission facilities.
1
,Page 2 of 93
b. To ensure that BA do not excessively depend on other BA areas for meeting their Interchange
obligations
3. A BA has a sudden change in demand-supply balance due to a sudden loss of load or
generation in their area. The sudden change will be seen instantaneously in which calculated
value?
a. Frequency
b. system lambda
c. operating reserves
d. ACE
d. ACE
4. An external generator tripped that was large enough to reduce the frequency from 60.00
Hz to 59.94 Hz. Your BA's Frequency Bias is 200 MW/0.1 Hz. How many MW would your
system initially contribute to frequency support?
a. 80 MW
b. 100 MW
c. 200 MW
d. 120 MW
d. 120 MW
5. BA-A is currently reading a system freq of 59.95 Hz. Its Net Actual Interchange is +100 MW
and its Net Scheduled Interchange is +120 MW. If BA-A's freq bias setting is -100 Mw, BA-A's
2
,Page 3 of 93
AGC is pulsing its generators to _____________.
a. Remain at current MW output level
b. Increase MW output
c. Decrease MW output
d. Increase excitation on the field windings
b. Increase MW output
6. Which control system on the generators would respond to a drop in system freq resulting
from the loss of generation?
a. Generator governor control system
b. Differential relay systems
c. Special protection systems
d. Automatic Voltage Regulators
a. Generator governor control system
7. Load increases or decreases in relation to the increase or decrease in frequency. It has been
determined that for every 1% change in freq, load will change approx ______% iin the same
direction in an Interconnected system.
a. 1
b. 2
c. 5
d. 3
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b. 2 (3 if it is pure motor load)
8. A BA has several units on governor control. The units have different capacities that range
from 200 MW to 1000 MW and droop settings from 2% to 5%. The biggest adjustments in
MW output in response to a freq disturbance will be provided by units that have __________.
a. large capacity; large droop setting
b. large capacity; small droop setting
c. small capacity; large droop setting
d. small capacity; small droop setting
b. large capacity; small droop setting
9. A BA that is operating asynchronously (separated from the interconnection) should switch
its AGC to which mode?
a. tie line bias control
b flat tie line control
c. flat frequency control
d. manual control
c. flat frequency control
10. If the BA selling power to an end user enters the wrong schedule for the upcoming hour,
which part of the ACE equatio [ACE = (NIA - NIS) - 10B(FA - FS) - IME], will cause Inadvertent
Interchange to occur as the result of the incorrect shedule?
a. Both the Interchange and freq portions will contribute (NIA - NIS) - 10B(FA - FS)
4
NERC Certification Preparation Exam 300
QUESTIONS AND CORRECT ANSWERS LATEST
UPDATE THIS YEAR NEW!!
1. Inadvertent interchange accumulations that are paid back by controlling to a target of non-
zero ACE and is limited by the BA's L10 is known as ________.
a. bilateral payback
b. selective payback
c. transmission payback
d. unilateral payback
d. unilateral payback
2. What is the purpose in account for Inadvertent Interchange amon=g the BA?
a. To maintain adequate reliability of energy transactions across each Interconnection.
b. To ensure that BA do not excessively depend on other BA areas for meeting their
Interchange obligations.
c. To compensate those orgs that take on the responsibility of operating a BA.
d. So that large energy providers can demonstrate the profitability of owning and operating
generation and transmission facilities.
1
,Page 2 of 93
b. To ensure that BA do not excessively depend on other BA areas for meeting their Interchange
obligations
3. A BA has a sudden change in demand-supply balance due to a sudden loss of load or
generation in their area. The sudden change will be seen instantaneously in which calculated
value?
a. Frequency
b. system lambda
c. operating reserves
d. ACE
d. ACE
4. An external generator tripped that was large enough to reduce the frequency from 60.00
Hz to 59.94 Hz. Your BA's Frequency Bias is 200 MW/0.1 Hz. How many MW would your
system initially contribute to frequency support?
a. 80 MW
b. 100 MW
c. 200 MW
d. 120 MW
d. 120 MW
5. BA-A is currently reading a system freq of 59.95 Hz. Its Net Actual Interchange is +100 MW
and its Net Scheduled Interchange is +120 MW. If BA-A's freq bias setting is -100 Mw, BA-A's
2
,Page 3 of 93
AGC is pulsing its generators to _____________.
a. Remain at current MW output level
b. Increase MW output
c. Decrease MW output
d. Increase excitation on the field windings
b. Increase MW output
6. Which control system on the generators would respond to a drop in system freq resulting
from the loss of generation?
a. Generator governor control system
b. Differential relay systems
c. Special protection systems
d. Automatic Voltage Regulators
a. Generator governor control system
7. Load increases or decreases in relation to the increase or decrease in frequency. It has been
determined that for every 1% change in freq, load will change approx ______% iin the same
direction in an Interconnected system.
a. 1
b. 2
c. 5
d. 3
3
, Page 4 of 93
b. 2 (3 if it is pure motor load)
8. A BA has several units on governor control. The units have different capacities that range
from 200 MW to 1000 MW and droop settings from 2% to 5%. The biggest adjustments in
MW output in response to a freq disturbance will be provided by units that have __________.
a. large capacity; large droop setting
b. large capacity; small droop setting
c. small capacity; large droop setting
d. small capacity; small droop setting
b. large capacity; small droop setting
9. A BA that is operating asynchronously (separated from the interconnection) should switch
its AGC to which mode?
a. tie line bias control
b flat tie line control
c. flat frequency control
d. manual control
c. flat frequency control
10. If the BA selling power to an end user enters the wrong schedule for the upcoming hour,
which part of the ACE equatio [ACE = (NIA - NIS) - 10B(FA - FS) - IME], will cause Inadvertent
Interchange to occur as the result of the incorrect shedule?
a. Both the Interchange and freq portions will contribute (NIA - NIS) - 10B(FA - FS)
4
