NERC Practice Quizzes Exam Questions and
Answers.
A fault has occurred in your power system. What will the System Operator look for?
a. A condition where a component is not in sync with the rest of the system
b. A condition that causes a device, component, or element to fail
c. A condition of abnormal electric current
d. A condition of abnormal electric current which causes protective relays to operate -
Correct Answer d. A condition of abnormal electric current which causes protective
relays to operate
Potential Transformer and Current Transformers are used primary for which purpose?
a. Measure the potential energy
b. Step up the power flow to reduce losses
c. Monitor safety
d. Convert the measured value to a lower value for relays - Correct Answer d. Convert
the measured value to a lower value for relays
When isolating electrical equipment, you must have a visible open point usually
provided by which device?
a. Disconnect switches
b. Circuit Breakers
c. Arresters
d. Relay protection - Correct Answer A. Disconnect switches
Frequency reading is 59.99 Hz, when monitoring the generation, you notice frequency is
59.21 Hz at a large generating facility. What is this an indication of?
a. Generator tripped
b. Load tripped
, c. Island condition
d. Bad frequency meter - Correct Answer C. Island condition
Station A is at 345 kV. Station B is at 343 kV. Megawatts flow from Station A to Station
B. Which direction will MVAR flow?
a. From high impedance to low impedance
b. From high power angle to low power angle
c. From Station B to Station A
d. From Station A to Station B - Correct Answer D. From Station A to Station B
Between two substations, MVARs are flowing from Station A to Station B, when the line
between the substation trips. What would you expect the voltage impacted to be?
a. Voltage A will be higher than Voltage B
b. There will be no difference between Voltage A and Voltage B
c. Voltage B will be higher than Voltage A
d. There will be no voltage at either point - Correct Answer A. Voltage A will be higher
than Voltage B
What must a Reliability Coordinator be concerned with when their Transmission
Operators are ready to synchronize systems?
a. System loads are equal on both sides, MW generation must be the same on both
sides
b. System load and generation must be balanced on both sides, voltage and frequency
must closely match on both sides
c. System load are balanced on both sides, frequency must be matched on both sides
d. Phase angle, frequency, and voltage must be exact on both sides - Correct Answer
B. System load and generation must be balanced on both sides, voltage and frequency
must closely match on both sides
What are the effects of transmission line loading above surge impedance loading?
Answers.
A fault has occurred in your power system. What will the System Operator look for?
a. A condition where a component is not in sync with the rest of the system
b. A condition that causes a device, component, or element to fail
c. A condition of abnormal electric current
d. A condition of abnormal electric current which causes protective relays to operate -
Correct Answer d. A condition of abnormal electric current which causes protective
relays to operate
Potential Transformer and Current Transformers are used primary for which purpose?
a. Measure the potential energy
b. Step up the power flow to reduce losses
c. Monitor safety
d. Convert the measured value to a lower value for relays - Correct Answer d. Convert
the measured value to a lower value for relays
When isolating electrical equipment, you must have a visible open point usually
provided by which device?
a. Disconnect switches
b. Circuit Breakers
c. Arresters
d. Relay protection - Correct Answer A. Disconnect switches
Frequency reading is 59.99 Hz, when monitoring the generation, you notice frequency is
59.21 Hz at a large generating facility. What is this an indication of?
a. Generator tripped
b. Load tripped
, c. Island condition
d. Bad frequency meter - Correct Answer C. Island condition
Station A is at 345 kV. Station B is at 343 kV. Megawatts flow from Station A to Station
B. Which direction will MVAR flow?
a. From high impedance to low impedance
b. From high power angle to low power angle
c. From Station B to Station A
d. From Station A to Station B - Correct Answer D. From Station A to Station B
Between two substations, MVARs are flowing from Station A to Station B, when the line
between the substation trips. What would you expect the voltage impacted to be?
a. Voltage A will be higher than Voltage B
b. There will be no difference between Voltage A and Voltage B
c. Voltage B will be higher than Voltage A
d. There will be no voltage at either point - Correct Answer A. Voltage A will be higher
than Voltage B
What must a Reliability Coordinator be concerned with when their Transmission
Operators are ready to synchronize systems?
a. System loads are equal on both sides, MW generation must be the same on both
sides
b. System load and generation must be balanced on both sides, voltage and frequency
must closely match on both sides
c. System load are balanced on both sides, frequency must be matched on both sides
d. Phase angle, frequency, and voltage must be exact on both sides - Correct Answer
B. System load and generation must be balanced on both sides, voltage and frequency
must closely match on both sides
What are the effects of transmission line loading above surge impedance loading?
