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NERC EXAM QUESTIONS AND ANSWERS
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NERC EXAM QUESTIONS AND ANSWERS
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NERC EXAM QUESTIONS AND ANSWERSA Balancing Authority notices that Operating Reserve has steadily declined throughout
the hour. What is the most likely cause?
a) Loss of a large generator in the area
b) An inaccurate load forecast
c) Loss of a major transmission line
d) A malfunction of EMS - answer- b) An inaccurate load forecast
Balancing Area A notices that the Interconnection frequency is 59.94 Hz and their ACE
is 0. Which of the following could be the cause of this reading?
a) A net under-generation in Balancing Area A
b) A net under-generation in the Interconnection
c) A loss of load in Balancing Area A
d) A loss of load in the Interconnection - answer- b) A net under-generation in the
Interconnection
What is the penalty for a Balancing Authority violating the Disturbance Control
Standard?
a) Must carry additional Contingency Reserve
b) Must develop a correction action plan
c) Must re-evaluate and change its Frequency Bias Setting
d) Must increase its Regulating Reserve - answer- a) Must carry additional Contingency
Reserve
Your ACE is a large negative value and system frequency is 59.80 Hz. Your AGC
system is pulsing your units down. What should you do?
a) Place AGC in flat frequency control
b) Place AGC in flat tie line control
c) Suspend AGC and investigate
d) Do nothing as this is normal - answer- c) Suspend AGC and investigate
When two identical generating units are operated in parallel on governor control, and on
machine has a 5% droop and the other has a 10% droop, the unit with the greater
(10%) governor droop will:
a) Respond less to frequency deviations
b) Respond more to frequency deviations
c) Respond the same to frequency deviations
d) Not adjust for frequency changes - answer- a) Respond less to frequency deviations
, On a radial transmission system a generator has a capacity of 600 MWs. The Droop
characteristic is at 5% and the generator is currently loaded at 300 MWs. If frequency
suddenly drops to 59.3 Hz, what would be the total generator output?
a) 350
b) 400
c) 440
d) 600 - answer- c) 440
What is the main purpose of the Frequency Bias Setting in the ACE equation?
a) Control frequency to 60 Hz for the entire Interconnection
b) Assist with arresting frequency deviations
c) Restore frequency to 60 Hz after a disturbance
d) maintains frequency between 59.95 and 60.05 Hz - answer- b) Assist with arresting
frequency deviations
In a permissive protective relay scheme, the term "permissive" refers to:
a) The receipt of a telecommunications signal from the opposite line terminal
b) The process of automatic re-testing of a tripped line section
c) The system operator granting permission for a line to trip
d) The enabling of an automatic reclosing scheme - answer- a) The receipt of a
telecommunications signal from the opposite line terminal
The NERC standards require the use of three-part communication when issuing and
receiving Operating Instructions. Which of the following would fall into that category?
a) A discussion with the RC about a possible contingency
b) Switching instruction s to a field operator
c) Two Transmission Operators discussing in a System Operating Limit
d) A System Operator reporting system conditions to his supervisor - answer- b)
Switching instructions to a field operator
A Balancing Authority receives an Operating Instruction from its Reliability Coordinator.
The Balancing Authority must comply with the Operating Instruction unless:
a) It results in separation from the Interconnection
b) The Balancing Authority disagrees with it
c) Has serious financial implications
d) Results in danger - answer- d) Results in danger
Which of the following is extremely important in determining system load when
performing a next day study:
a) Transmission configuration
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