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 ...
NERC Practice Test, Exam Questions & Answers
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.
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
The transmission Operator and BA shall provide documentation that operating
personnel have ______ to implement real time actions to ensure the stable and
reliable operation of the BES. - Proper NERC Certification Credential
A utility distribution bus has the following customer loads attached. What is the
total customer MW load and is the total customer load capacitive or inductive? 5
MW 1 MVAR & 3 MW 1 MVAR & 2 MW -2 MVAR & 10 MW 3 MVAR - 20
mw and Inductive
How many MVARs does a 230 kV, 50 MVAR capacitor bank provide when the
voltage id 207 kV - Actual MW/ Rated MW ^2 x Capacitor Rating
40
You are a system operator and the load forecast is for an all time summer peak
load day, generations and reactive resources will be tight. Which scheduled job
would you allow to proceed? - 735 kV shunt reactor maintenance.
A contingency results in the exceedance of an IROL. What could be the result if
the IROL is allowed to be exceeded longer than T sub v - Interruption of power to
a large part of the BES
Generators have the ability to be used as voltage control devices. If a generator
raises its VAR output, the system orator should expect system stage to? - Increase
The actual voltage is 362kV on a 345 bus. What is the p.u. voltage? - 1.05
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