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EPRI Chapter Test - Questions And Answers (Passed!) CA$15.05   Add to cart

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EPRI Chapter Test - Questions And Answers (Passed!)

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EPRI Chapter Test - Questions And Answers (Passed!)

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  • January 8, 2024
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  • 2023/2024
  • Exam (elaborations)
  • Questions & answers
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EPRI Chapter Test - Questions And Answers (Passed!)

If a generator is producing 500MW and 200Mvar, the generator is:
✔️Ans -Lagging

87 ✔️Ans -Is the IEEE device number for a differential relay.

Can a Synchronous machine have a negative torque angle? What doies this
mean? ✔️Ans -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? ✔️Ans -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?
✔️Ans -50A/5000W

Which of the following is not a synchronizong variable? ✔️Ans -
MW flow differential.

In a typical multi-stage steam turbine, the governor control valves control
steam entry into the: ✔️Ans -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? ✔️Ans -345KV

Thermal limits are the direct result of? ✔️Ans -The thermal
capability of system equipment.

Reactive power flow is influenced more by system power and torque angles
than reactive power. True or False ✔️Ans -False

At what line power angle does the MW transfer across a transmission path
equal 1/2 of the path's Pmax? ✔️Ans -30 degrees

, A transmission line is rated at 1000MVA. The power flow on the line is 0MW
and 1001Mvar. Is the transmission line overloaded? ✔️Ans -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? ✔️Ans -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 ✔️Ans -
True

Angle instability is the result of: ✔️Ans -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: ✔️Ans -90
degrees.

If the resistance is ignored, the maximum theoretical Mvar flow across a line
will occur at a power angle of: ✔️Ans -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? ✔️Ans -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? ✔️Ans -200MW

A governor with a 0% droop is called: ✔️Ans -An isochronous
governor

Steam turbine generators typically have better governor response than
hydroelectric generating units. True or False ✔️Ans -False

A balancing authority's frequency bias is equal to: ✔️Ans -The
balancing authority's frequency response characteristic (FRC), the natural
response of the BA, The AGC system's bias value.

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