1
Additional NERC Exam 2025.
Questions and Correct Answers
Transmission
Q1: When current flow increases in the power system, losses in the system
will increase based on which of the following relationships?
A) Current times resistance squared
B) Current times impedance
C) Current squared times resistance
D) Current squared times impedance - ANSC) Current squared times
resistance
Q11: Two adjacent lines exist in a Balancing Area that are the same length
and have the same ratings. One line is overhead and the other is
underground. How do these two lines respond as load picks up through the
day?
A) The overhead line will carry more of the load increase
B) The underground line will carry more of the load increase
C) The load increase will be distributed evenly over the two lines
D) The line with the higher impedance will carry more of the load - ANSB)
The underground line will carry more of the load increase Feedback: EPRI
Tutorial: Due to its higher capacitive property, the underground cable will
have lower impedance and therefore carry more of the increase.
Q12: To be effective, reactive resources should be:
A) Centrally located in the system
1
, 2
B) Located close to generation
C) Located in the same station as other reactive resources
D) Located close to load areas - ANSD) Located close to load areas
Q13: Line A and Line B are two identically constructed parallel transmission
lines where Line A is 150 miles long and Line B is 15 miles long. Which
statement is true if both lines are lightly loaded?
A) A produces the same reactive power as B
B) B produces more reactive power than A
C) A produces more reactive power than B
D) Neither line produces any reactive power - ANSC) A produces more
reactive power than B
Q14: Which of the following conditions is an acceptable mitigating action for
which the Transmission Operator should open a transmission line?
A) Low voltage under heavy loads
B) High voltages under light loads
C) Studies indicate another line will exceed its limit
D) Opening a line is not acceptable under any conditions - ANSB) High
voltages under light loads
Q15: Lightly loaded transmission lines essentially behave like which of the
following?
A) Shunt reactors
B) Series Reactors
C) Shunt capacitors
D) Series capacitors - ANSC) Shunt capacitors
2
Additional NERC Exam 2025.
Questions and Correct Answers
Transmission
Q1: When current flow increases in the power system, losses in the system
will increase based on which of the following relationships?
A) Current times resistance squared
B) Current times impedance
C) Current squared times resistance
D) Current squared times impedance - ANSC) Current squared times
resistance
Q11: Two adjacent lines exist in a Balancing Area that are the same length
and have the same ratings. One line is overhead and the other is
underground. How do these two lines respond as load picks up through the
day?
A) The overhead line will carry more of the load increase
B) The underground line will carry more of the load increase
C) The load increase will be distributed evenly over the two lines
D) The line with the higher impedance will carry more of the load - ANSB)
The underground line will carry more of the load increase Feedback: EPRI
Tutorial: Due to its higher capacitive property, the underground cable will
have lower impedance and therefore carry more of the increase.
Q12: To be effective, reactive resources should be:
A) Centrally located in the system
1
, 2
B) Located close to generation
C) Located in the same station as other reactive resources
D) Located close to load areas - ANSD) Located close to load areas
Q13: Line A and Line B are two identically constructed parallel transmission
lines where Line A is 150 miles long and Line B is 15 miles long. Which
statement is true if both lines are lightly loaded?
A) A produces the same reactive power as B
B) B produces more reactive power than A
C) A produces more reactive power than B
D) Neither line produces any reactive power - ANSC) A produces more
reactive power than B
Q14: Which of the following conditions is an acceptable mitigating action for
which the Transmission Operator should open a transmission line?
A) Low voltage under heavy loads
B) High voltages under light loads
C) Studies indicate another line will exceed its limit
D) Opening a line is not acceptable under any conditions - ANSB) High
voltages under light loads
Q15: Lightly loaded transmission lines essentially behave like which of the
following?
A) Shunt reactors
B) Series Reactors
C) Shunt capacitors
D) Series capacitors - ANSC) Shunt capacitors
2
