Practice Test NERC Questions and Solutions
The phase angle will increase. When load is
increased phase angle will increase.
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?
90 pf= mw/mva
A load has a power factor
of 0.9 lagging. If the load
draws 100 MVA, what is
the MW draw?
Vl-l= square root of 3 times Vl-g 1.73x191= 345kV
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?
3-4-5 triangle 500 MVA
If a transmission line is
carrying 400 MW and 300
MVAR what is the MVA?
Turbine
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?
, Practice Test NERC Questions and Solutions
Synchronous condensers
Reactive reserve
response during a
disturbance is best
obtained from which
devise?
A produces more reactive power than B.
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?
Shunt Capacitors
Lightly loaded
transmission lines
essentially behave like?
Isolate the line
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?
63%
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?
High Voltage to Low Voltage
Which statement best
describes how reactive
power MVAR power
normally flows?
, Practice Test NERC Questions and Solutions
Generator start up cost
Which of the following
types of data are BA and
RC not required to share
with one another?
Planned outages of generation units
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?
Operating in a lagging mode. Inductive system
A 1000 MVA rated
generator that produces
800 MW and 100 MVAR is
best described as?
Motor
Which of the following
types of MW load is the
most impacted by an
intentional frequency
reduction?
Angle Instability
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?
, Practice Test NERC Questions and Solutions
480 V
The phase voltage in a
wye-connected load is
277 V. What is the line to
line voltage?
300 MW and No
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?
Forecasted Weather
The best prediction of
system load is the load
forecast tool that uses?
1/10 of 360 so 36
If the phase angel at an
open breaker is equal to
1/10 of a cycle, this is the
the same angle as?
Contingency Analysis
A ___________ tool is
used to ensure the power
system can respond within
acceptable limits of N-1
Ancillary service pricing
Which of the following
activities would not be
included in the procedures
for transmission reliability?
The phase angle will increase. When load is
increased phase angle will increase.
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?
90 pf= mw/mva
A load has a power factor
of 0.9 lagging. If the load
draws 100 MVA, what is
the MW draw?
Vl-l= square root of 3 times Vl-g 1.73x191= 345kV
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?
3-4-5 triangle 500 MVA
If a transmission line is
carrying 400 MW and 300
MVAR what is the MVA?
Turbine
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?
, Practice Test NERC Questions and Solutions
Synchronous condensers
Reactive reserve
response during a
disturbance is best
obtained from which
devise?
A produces more reactive power than B.
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?
Shunt Capacitors
Lightly loaded
transmission lines
essentially behave like?
Isolate the line
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?
63%
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?
High Voltage to Low Voltage
Which statement best
describes how reactive
power MVAR power
normally flows?
, Practice Test NERC Questions and Solutions
Generator start up cost
Which of the following
types of data are BA and
RC not required to share
with one another?
Planned outages of generation units
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?
Operating in a lagging mode. Inductive system
A 1000 MVA rated
generator that produces
800 MW and 100 MVAR is
best described as?
Motor
Which of the following
types of MW load is the
most impacted by an
intentional frequency
reduction?
Angle Instability
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?
, Practice Test NERC Questions and Solutions
480 V
The phase voltage in a
wye-connected load is
277 V. What is the line to
line voltage?
300 MW and No
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?
Forecasted Weather
The best prediction of
system load is the load
forecast tool that uses?
1/10 of 360 so 36
If the phase angel at an
open breaker is equal to
1/10 of a cycle, this is the
the same angle as?
Contingency Analysis
A ___________ tool is
used to ensure the power
system can respond within
acceptable limits of N-1
Ancillary service pricing
Which of the following
activities would not be
included in the procedures
for transmission reliability?
