KNOWN NERC EXAM QUESTIONS: FROM CLASS VERIFIED QUESTIONS & ANSWERS

KNOWN NERC EXAM QUESTIONS:
FROM CLASS VERIFIED
QUESTIONS & ANSWERS


A Balancing Authority notices that Operating Reserve has steadily declined throug
nb nb nb nb nb nb nb nb nb nb


hout the hour. What is the most likely cause?
nb nb nb nb nb nb nb nb




a) nb Loss of a large generator in the area
nb nb nb nb nb nb nb


b) nb An inaccurate load forecast
nb nb nb


c) nb Loss of a major transmission line
nb nb nb nb nb


d) nb A malfunction of EMS - ANSWERS-b) An inaccurate load forecast
nb nb nb nb nb nb nb nb nb




Balancing Area A notices that the Interconnection frequency is 59.94 Hz and their
nb nb nb nb nb nb nb nb nb nb nb nb nb


ACE is 0. Which of the following could be the cause of this reading?
nb nb nb nb nb nb nb nb nb nb nb nb nb




a) A net under-generation in Balancing Area A
nb nb nb nb nb nb nb


b) A net under-generation in the Interconnection
nb nb nb nb nb nb


c) A loss of load in Balancing Area A
nb nb nb nb nb nb nb nb


d) A loss of load in the Interconnection - ANSWERS-b) A net under-
nb nb nb nb nb nb nb nb nb nb nb nb


generation in the Interconnection nb nb nb




What is the penalty for a Balancing Authority violating the Disturbance Control Sta
nb nb nb nb nb nb nb nb nb nb nb nb


ndard?

a) nb Must nb carry additional Contingency Reserve
nb nb nb


b) nb Must nb develop a correction action plan nb nb nb nb


c) nb Must nb re-evaluate and change its Frequency Bias Setting nb nb nb nb nb nb


d) nb Must nb increase its Regulating Reserve - ANSWERS-
nb nb nb nb nb


a) nb Must nb carry additional Contingency Reserve
nb nb nb




Your ACE is a large negative value and system frequency is 59.80 Hz. Your AGC
nb nb nb nb nb nb nb nb nb nb nb nb nb nb n


system is pulsing your units down. What should you do?
b nb nb nb nb nb nb nb nb nb




a) nb Place AGC in flat frequency control
nb nb nb nb nb


b) nb Place AGC in flat tie line control
nb nb nb nb nb nb


c) nb Suspend AGC and investigate nb nb nb


d) nb Do nothing as this is normal - ANSWERS-c) Suspend AGC and investigate
nb nb nb nb nb nb nb nb nb nb nb




When two identical generating units are operated in parallel on governor control, a
nb nb nb nb nb nb nb nb nb nb nb nb


nd on machine has a 5% droop and the other has a 10% droop, the unit with the
nb nb nb nb nb nb nb nb nb nb nb nb nb nb nb nb nb nb


greater (10%) governor droop will:
nb nb nb nb




a) Respond less to frequency deviations
nb nb nb nb nb


b) Respond more to frequency deviations
nb nb nb nb nb

, c) Respond the same to frequency deviations
nb nb nb nb nb nb


d) Not adjust for frequency changes - ANSWERS-
nb nb nb nb nb nb nb


a) Respond less to frequency deviations
nb nb nb nb nb




On a radial transmission system a generator has a capacity of 600 MWs. The Dro
nb nb nb nb nb nb nb nb nb nb nb nb nb nb


op characteristic is at 5% and the generator is currently loaded at 300 MWs. If fre
nb nb nb nb nb nb nb nb nb nb nb nb nb nb nb


quency suddenly drops to 59.3 Hz, what would be the total generator output?
nb nb nb nb nb nb nb nb nb nb nb nb




a) nb 350
b) nb 400
c) nb 440 nb


d) nb 600 - ANSWERS-c) 440
nb nb nb




What is the main purpose of the Frequency Bias Setting in the ACE equation?
nb nb nb nb nb nb nb nb nb nb nb nb nb




a) nb Control frequency to 60 Hz for the entire Interconnection
nb nb nb nb nb nb nb nb


b) nb Assist with arresting frequency deviations
nb nb nb nb


c) nb Restore frequency to 60 Hz after a disturbance
nb nb nb nb nb nb nb


d) nb maintains frequency between 59.95 and 60.05 Hz - ANSWERS-
nb nb nb nb nb nb nb nb


b) nb Assist with arresting frequency deviations
nb nb nb nb




A Balancing Authority has a Frequency Bias Setting of -
nb nb nb nb nb nb nb nb nb


200 MW/.1Hz. What is the Balancing Authority's Frequency Response for a freque
nb nb nb nb nb nb nb nb nb nb nb


ncy of 59.95 Hz?
nb nb nb




a) nb 10 MWs nb


b) nb 50 MWs nb


c) nb 100 MWs nb


d) nb 200 MWs - ANSWERS-c) 100 MWs
nb nb nb nb nb




Scheduled Interchange is 250 MWs and Actual Interchange is 285 MWs. The Bias
nb nb nb nb nb nb nb nb nb nb nb nb


Setting is 35 MW/.1Hz and frequency is 60.00 Hz with no time error correction in
nb nb nb nb nb nb nb nb nb nb nb nb nb nb nb nb


effect. Frequency suddenly drops to 59.80 Hz. What does ACE indicate after the d
nb nb nb nb nb nb nb nb nb nb nb nb nb


isturbance?

a) nb 70 nb MW nb under-generating
b) nb 70 nb MW nb over-generating
c) nb 35 nb MW nb under-generating
d) nb 35 nb MW nb over-generating - ANSWERS-d) 35 MW over-generating nb nb nb nb nb




Inadvertent energy accumulation occurs due to a difference in Net Actual Intercha
nb nb nb nb nb nb nb nb nb nb nb


nge and Net Interchange Schedule over time. This energy accumulation can be pa
nb nb nb nb nb nb nb nb nb nb nb nb


id back unilaterally by adjusting delivery of power:
nb nb nb nb nb nb nb nb




a) During off-peak periods
nb nb nb


b) During periods corresponding to those in which the inadvertent energy was acc
nb nb nb nb nb nb nb nb nb nb nb nb


umulated
c) On weekends
nb nb