EPRI EXAM PRACTICE QUESTIONS WITH
CORRECT ANSWERS!!
All of the following are forms of SSR EXCEPT:
A. Induction generator effect
B. Transient torque
C. Parallel induction
D. Torsional interaction
C. Parallel induction
SSR is more of a concern with hydroelectric units than with thermal units.
A. True
B. False
B. False
All of the following are methods of preventing distribution system
ferroresonance EXCEPT:
A. Use grounded-wye to delta transformer connections
B. Keep resistive load connected to the transformer during switching
C. Switch at the transformer end of the distribution line
D. Use three-phase switching
A. Use grounded-wye to delta transformer connections
The currents that flow in the earth's surface as a result of solar magnetic
disturbances are called:
A. Electrojets
B. Geomagnetic induced currents
C. Earth surface potentials
D. Sunspot currents
B. Geomagnetic induced currents
, The currents induced by solar magnetic disturbances enter the power
system via:
A. Series capacitors
B. Shunt capacitors
C. Transformer delta windings
D. Transformer grounded neutrals
D. Transformer grounded neutrals
In a 60 HZ system, the frequency of the 8th Harmonic is:
A. 480 HZ
B. 100 HZ
C. 200 HZ
D. 300 HZ
A. 480 HZ
Shunt capacitor tripping can be a problem during GMD activity. Why?
A. Because high frequency GIC currents flow into the shunt
capacitors
B. Because GIC currents saturate transformers which creates high
frequency harmonics which cause the shunt capacitors to trip
C. Because GIC currents enter the power system through the
grounded neutrals of the shunt capacitors
D. Because shunt capacitors trip from high ESP
B. Because GIC currents saturate transformers which creates high
frequency harmonics which cause the shunt capacitors to trip
Assume a transmission line has a series inductive reactance of 100 ohms
and a series capacitive reactance of 50 ohms. What amount of series
capacitance (in ohms) must be added to create a series resonance
condition?
A. 100
B. 50
CORRECT ANSWERS!!
All of the following are forms of SSR EXCEPT:
A. Induction generator effect
B. Transient torque
C. Parallel induction
D. Torsional interaction
C. Parallel induction
SSR is more of a concern with hydroelectric units than with thermal units.
A. True
B. False
B. False
All of the following are methods of preventing distribution system
ferroresonance EXCEPT:
A. Use grounded-wye to delta transformer connections
B. Keep resistive load connected to the transformer during switching
C. Switch at the transformer end of the distribution line
D. Use three-phase switching
A. Use grounded-wye to delta transformer connections
The currents that flow in the earth's surface as a result of solar magnetic
disturbances are called:
A. Electrojets
B. Geomagnetic induced currents
C. Earth surface potentials
D. Sunspot currents
B. Geomagnetic induced currents
, The currents induced by solar magnetic disturbances enter the power
system via:
A. Series capacitors
B. Shunt capacitors
C. Transformer delta windings
D. Transformer grounded neutrals
D. Transformer grounded neutrals
In a 60 HZ system, the frequency of the 8th Harmonic is:
A. 480 HZ
B. 100 HZ
C. 200 HZ
D. 300 HZ
A. 480 HZ
Shunt capacitor tripping can be a problem during GMD activity. Why?
A. Because high frequency GIC currents flow into the shunt
capacitors
B. Because GIC currents saturate transformers which creates high
frequency harmonics which cause the shunt capacitors to trip
C. Because GIC currents enter the power system through the
grounded neutrals of the shunt capacitors
D. Because shunt capacitors trip from high ESP
B. Because GIC currents saturate transformers which creates high
frequency harmonics which cause the shunt capacitors to trip
Assume a transmission line has a series inductive reactance of 100 ohms
and a series capacitive reactance of 50 ohms. What amount of series
capacitance (in ohms) must be added to create a series resonance
condition?
A. 100
B. 50
