NERC FULL ACTUAL EXAM CURRENTLY TESTING QUESTIONS -VERIFIED WITH
COMPLETE & ACCURATE ANSWERS ALREADY GRADED A+
A transmission line is operating with a voltage phase angle different of 30 degrees between
the sending Vs and the receiving bus Vr. If the receiving end load is suddenly increased, the
voltage phase angle difference will be?
The phase angle will increase. When load is increased phase angle will increase.
A load has a power factor of 0.9 lagging. If the load draws 100 MVA, what is the MW draw?
90 pf= mw/mva
The high side of a delta-wye connection transformer is connected to a power system with
199 kV L-G high side voltage. What is the voltage across the delta winding of the
transformer?
Vl-l= square root of 3 times Vl-g 1.73x191= 345kV
If a transmission line is carrying 400 MW and 300 MVAR what is the MVA?
3-4-5 triangle 500 MVA
The prime mover is the component of the generator that creates the rotational force. In a
typical coal fired steam generator what component spins the rotor?
Turbine
,Reactive reserve response during a disturbance is best obtained from which devise?
Synchronous condensers
For two identically constructed transmission lines where Line A is 150 miles long and line B
is 15 miles long, if both lines are lightly loaded?
A produces more reactive power than B.
Lightly loaded transmission lines essentially behave like?
Shunt Capacitors
You receive an alarm that indicates low oil pressure on an underground transmission cable.
SCADA shows the pressure is continuing to drop. What is the first step you take to protect
the line?
Isolate the line
Computer simulations show that for a 100 MW schedule from Bus A to Bus B, 63% of the
schedule will flow on the scheduled path and the remainder will flow on other parallel
paths. What is the distribution factor for the scheduled path?
63%
Which statement best describes how reactive power MVAR power normally flows?
High Voltage to Low Voltage
,Which of the following types of data are BA and RC not required to share with one another?
Generator start up cost
TOP must develop, maintain, and implement formal policies and procedures to provide for
transmission reliability. Which of the following DOES NOT need to be addressed in these
policies and procedures?
Planned outages of generation units
A 1000 MVA rated generator that produces 800 MW and 100 MVAR is best described as?
Operating in a lagging mode. Inductive system
Which of the following types of MW load is the most impacted by an intentional frequency
reduction?
Motor
Assume there are two 250 mile long transmission lines exporting an excessive amount of
MW from a generation area to a load area. One of the lines suddenly trips and the area
power system collapses within a few seconds. The most likely cause of the collapse?
Angle Instability
, The phase voltage in a wye-connected load is 277 V. What is the line to line voltage?
480 V
A simple power system is composed of three lines connecting generation to load. Each
lines the same impedance, is initially loaded at 200 MW, and has a thermal limit of 400 MW.
If one line trips, what the loading on the shortest remaining line be and will the thermal limit
either remaining line be violated?
300 MW and No
The best prediction of system load is the load forecast tool that uses?
Forecasted Weather
If the phase angel at an open breaker is equal to 1/10 of a cycle, this is the the same angle
as?
1/10 of 360 so 36
A ___________ tool is used to ensure the power system can respond within acceptable
limits of N-1
Contingency Analysis
Which of the following activities would not be included in the procedures for transmission
reliability?
Ancillary service pricing
COMPLETE & ACCURATE ANSWERS ALREADY GRADED A+
A transmission line is operating with a voltage phase angle different of 30 degrees between
the sending Vs and the receiving bus Vr. If the receiving end load is suddenly increased, the
voltage phase angle difference will be?
The phase angle will increase. When load is increased phase angle will increase.
A load has a power factor of 0.9 lagging. If the load draws 100 MVA, what is the MW draw?
90 pf= mw/mva
The high side of a delta-wye connection transformer is connected to a power system with
199 kV L-G high side voltage. What is the voltage across the delta winding of the
transformer?
Vl-l= square root of 3 times Vl-g 1.73x191= 345kV
If a transmission line is carrying 400 MW and 300 MVAR what is the MVA?
3-4-5 triangle 500 MVA
The prime mover is the component of the generator that creates the rotational force. In a
typical coal fired steam generator what component spins the rotor?
Turbine
,Reactive reserve response during a disturbance is best obtained from which devise?
Synchronous condensers
For two identically constructed transmission lines where Line A is 150 miles long and line B
is 15 miles long, if both lines are lightly loaded?
A produces more reactive power than B.
Lightly loaded transmission lines essentially behave like?
Shunt Capacitors
You receive an alarm that indicates low oil pressure on an underground transmission cable.
SCADA shows the pressure is continuing to drop. What is the first step you take to protect
the line?
Isolate the line
Computer simulations show that for a 100 MW schedule from Bus A to Bus B, 63% of the
schedule will flow on the scheduled path and the remainder will flow on other parallel
paths. What is the distribution factor for the scheduled path?
63%
Which statement best describes how reactive power MVAR power normally flows?
High Voltage to Low Voltage
,Which of the following types of data are BA and RC not required to share with one another?
Generator start up cost
TOP must develop, maintain, and implement formal policies and procedures to provide for
transmission reliability. Which of the following DOES NOT need to be addressed in these
policies and procedures?
Planned outages of generation units
A 1000 MVA rated generator that produces 800 MW and 100 MVAR is best described as?
Operating in a lagging mode. Inductive system
Which of the following types of MW load is the most impacted by an intentional frequency
reduction?
Motor
Assume there are two 250 mile long transmission lines exporting an excessive amount of
MW from a generation area to a load area. One of the lines suddenly trips and the area
power system collapses within a few seconds. The most likely cause of the collapse?
Angle Instability
, The phase voltage in a wye-connected load is 277 V. What is the line to line voltage?
480 V
A simple power system is composed of three lines connecting generation to load. Each
lines the same impedance, is initially loaded at 200 MW, and has a thermal limit of 400 MW.
If one line trips, what the loading on the shortest remaining line be and will the thermal limit
either remaining line be violated?
300 MW and No
The best prediction of system load is the load forecast tool that uses?
Forecasted Weather
If the phase angel at an open breaker is equal to 1/10 of a cycle, this is the the same angle
as?
1/10 of 360 so 36
A ___________ tool is used to ensure the power system can respond within acceptable
limits of N-1
Contingency Analysis
Which of the following activities would not be included in the procedures for transmission
reliability?
Ancillary service pricing
