EPRI Chapter Test Questions & Answers 2023/2024
If a generator is producing 500MW and 200Mvar, the generator is: - ANSWER-Lagging
87 - ANSWER-Is the IEEE device number for a differential relay.
Can a Synchronous machine have a negative torque angle? What doies this mean? - ANSWER-Yes, th...
If a generator is producing 500MW and 200Mvar, the generator is: - ANSWER-Lagging
87 - ANSWER-Is the IEEE device number for a differential relay.
Can a Synchronous machine have a negative torque angle? What doies this mean? - ANSWER-Yes, the
machine is absorbing active power.
A customer load is fed at 12o Volts. The customer's voltage is doubled while the load magnitude stays
the same. What effect does this have on the power losses? - ANSWER-Decreases the losses by a factor of
4.
In a DC circuit, a 100V battery is connected to both sides of a 2 ohm resistor. What is the current through
the resister and the power usage of the resister? - ANSWER-50A/5000W
Which of the following is not a synchronizong variable? - ANSWER-MW flow differential.
In a typical multi-stage steam turbine, the governor control valves control steam entry into the: -
ANSWER-High pressure turbine
The high side of a delta-wye connected transformer is connected to a power system with 199KV L-G high
side voltage. What is the voltage across the winding of the delta transformer? - ANSWER-345KV
Thermal limits are the direct result of? - ANSWER-The thermal capability of system equipment.
Reactive power flow is influenced more by system power and torque angles than reactive power. True or
False - ANSWER-False
, At what line power angle does the MW transfer across a transmission path equal 1/2 of the path's Pmax?
- ANSWER-30 degrees
A transmission line is rated at 1000MVA. The power flow on the line is 0MW and 1001Mvar. Is the
transmission line overloaded? - ANSWER-Yes
The TTC limit has been determined to be 1000MW from east to west for a particular transmission path.
The transmission path operator sells 500MW of its TTC. What is the path's ATC? - ANSWER-500MW
A distribution line is rated for 50MVA. The line's power flow is currently 50MW and -50Mvar. The line is
overloaded. True or Flase - ANSWER-True
Angle instability is the result of: - ANSWER-High torque and power angles.
If the resistance is ignored, the maximum theoretical MW flow across a transmission line will occur at a
power angle of: - ANSWER-90 degrees.
If the resistance is ignored, the maximum theoretical Mvar flow across a line will occur at a power angle
of: - ANSWER-180 degrees
200MW is schediuled to flow from bus X to bus Y. Transmission line A-B has a distribution factor of 10%
for this schedule. How many MW will flow on transmission line A-B? - ANSWER-20MW
According to the load/frequency relationship, a 1% change in frequency will lead to what approximate
magnitude of load change in a typical 10000MW system? - ANSWER-200MW
A governor with a 0% droop is called: - ANSWER-An isochronous governor
Steam turbine generators typically have better governor response than hydroelectric generating units.
True or False - ANSWER-False
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