Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Test 4 > Main Gen > Flashcards

Main Gen Flashcards

1
Q 
The (1) is used to adjust (2) in order to control Main
Generator terminal voltage.
 (1)    (2)
A DC adjuster   Exciter Voltage
B. Voltage Regulator  DC adjuster
C. Exciter   Voltage Regulator ouput
D. DC adjuster  Exciter Current
A

D. DC adjuster Exciter Current

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Which one of the following Main Generator protective relays is designed to protect
against operating the Main Generator as a motor?
A. Field Forcing
B. Underexcitation
C. Reverse Power
D. Voltage Balance

A

C. Reverse Power

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

The following plant conditions exist:
• Reactor Power stable at 85%
• Pressurizer pressure = 2060 psia and stable
• Alarm EK-0311 “GENERATOR lOSS OF RELAY/REG POTENTIAL” was
received approximately 4 minutes ago.
The auxiliary operator, dispatched by the control room, reports that there is indication
of a blown fuse on one of the Voltage Regulator Potential transformers.
Which one of the following Main Generator protective devices “blocked” a generator
trip due to loss of field?
A. Field Forcing/Overexcitation (FF-K3)
B. Minimum Excitation Limiter (MEl)
C. Voltage Balance (360)
D. Volts / Hertz Limiter (VHl)

A

C. Voltage Balance (360)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Which of the following conditions will automatically cause the Main Generator Voltage
Regulator to shift to MANUAL?
A. Voltage Regulator Limiter Operation
B. Generator Protection Control Undervoltage Alarm
C. Generator Exciter Trouble Alarm
D. Exciter Field Overexcitation for - 33 sec.

A

D. Exciter Field Overexcitation for - 33 sec.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

The plant is at Mode 1 full power operation when, due to a malfunction, the Generator
Exciter Field Breaker trips.
Which of the following describes the resulting consequences?
A. The Main Generator automatic voltage control is lost, and voltage must be
controlled with the DC Adjuster.
B. The Main Generator, Main Turbine, and the Reactor will all trip.
C. Main Generator terminal voltage lowers to minimum setting (-10KV).
D. Main Generator terminal voltage remains stable and it cannot be controlled with the
AC or with the DC Adjuster.

A

B. The Main Generator, Main Turbine, and the Reactor will all trip.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Given the following conditions:
• The plant is at 100% power.
• All control systems in AUTO.
• The Main Turbine Generator has tripped due to a “Generator Neutral
Overvoltage” condition.
Assuming no operator action, which ONE (1) of the following describes the secondary
plant response immediately following the plant trip?
A. Atmospheric dump valves modulate open, FWRVs remain “as is”, and Moisture
Separator/Reheater Steam Control Valves close.
B. Main Steam Safety Valves modulate, feedwater control system closes FWRVs, and
Main Steam Isolation Valves close.
C. Feedwater control system feeds S/G’s to high level override setpoint, Main Steam
Isolation Valves close, and Moisture Separator/Reheater Steam Control Valves
close.
D. Main Steam Safety valves lift, Feedwater control system feeds S/G’s to high level
override setpoint, and Turbine Bypass Valves remain closed.

A

A. Atmospheric dump valves modulate open, FWRVs remain “as is”, and Moisture
Separator/Reheater Steam Control Valves close.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Given the following conditions:
• The plant is at Mode 1 full power operation when EK-1002 “HYDROGEN
PRESSURE HIGH OR LOW” alarms.
• The AO reports local hydrogen pressure @ 69 psig and is falling at a rate of 5 psig
every 10 minutes.
Which of the following describes the potential effects of this malfunction on the Main
Generator System?
A. A falling hydrogen pressure may result in low hydrogen purity, which will require the
generator to be purged. No impacts on generator load are expected, although
hydrogen gas temperature may increase.
B. If the cause of the hydrogen loss cannot be corrected and hydrogen pressure
continues to lower rapidly, then the main turbine and generator will have to be
tripped and the generator purged of hydrogen.
C. Operation of the Main Generator with less than 75 psig of hydrogen is not
permitted, and the generator should be immediately unloaded at 30% per hour.
D. This rate of hydrogen loss is consistent with the failure of the hydrogen side seal oil
pump, which can be easily corrected by starting the backup seal oil pump and
increasing the hydrogen flow to the generator.

A

B. If the cause of the hydrogen loss cannot be corrected and hydrogen pressure
continues to lower rapidly, then the main turbine and generator will have to be
tripped and the generator purged of hydrogen.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Main Generator System annunciator EK-0316 “GENERATOR FIELD
FORCING/OVEREXCITATION” has alarmed due to overexcitation.
Assuming no operator action, the NCO should observe that:
A. excitation current and voltage values are less than normal for Main Generator load.
B. the voltage regulator IMMEDIATELY shifts to manual control.
C. AFTER - 33 sec. the voltage regulator shifts to manual, AND the reactor trips 3
seconds after that, if the problem still exists.
D. the Main Generator, Main Turbine, and Reactor IMMEDIATELY trip when the alarm
sounds.

A

C. AFTER - 33 sec. the voltage regulator shifts to manual, AND the reactor trips 3
seconds after that, if the problem still exists.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Which ONE of the following alarms would require the operator to take IMMEDIATE
action to prevent a reactor trip if the plant was operating at power with the generator
synchronized to the power grid?
A. Generator Field Ground/Brush Failure.
B. Generator High Volts/Hertz.
C. Switchyard Critical Trouble.
D. Switchyard 125 VDC and 240 VAC Trouble.

A

B. Generator High Volts/Hertz

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

The Main Generator is off-line and filled with 76 psig of hydrogen.
Which of the following, if any, describes the consequences of operating the Main
Generator System with a high humidity (Dew point is rC)?
A. The Main Generator will need to undergo hydrogen Feed and Bleed as needed to
lower humidity.
B. The humidity must be lowered (Dew point temperature lowered) by purging the
hydrogen with C02.
C. High humidity can cause arcing in the generator due to the presence of water.
D. Since the Main Generator is off-line, humidity is not a concern, and no
consequences are expected.

A

A. The Main Generator will need to undergo hydrogen Feed and Bleed as needed to
lower humidity.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

The plant is in Mode 1 at full power.
Which of the following describes the actions required when annunciator EK-0317
“GENERATOR HI VOLTS/HERTZ” alarms?
A. Call the Area Power Control to reduce grid voltage to correct the problem.
B. Decrease load on the Main Generator using the DEH System controls.
C. Use the AC adjuster to manually reduce voltage with the voltage regulator switch in
OFF.
D. Use the AC adjuster to manually reduce voltage with the voltage regulator switch in
ON.

A

D~ Use the AC adjuster to manually reduce voltage with the voltage regulator switch in
ON.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

The plant is in Mode 1 at full power.
Which of the following describes the actions required to reduce generator excitation
when annunciator EK-0316 “GEN FIELD FORCING/OVEREXCITATION” alarms?
A. Decrease load on the Main Generator using the DEH System controls.
B. Call the Area Power Control to reduce grid voltage to correct the problem.
C.Use the AC Adjuster or DC adjuster, as appropriate, to manually lower voltage.
D. Use the AC adjuster to manually reduce voltage with the voltage regulator switch in
TEST.

A

C.Use the AC Adjuster or DC adjuster, as appropriate, to manually lower voltage.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Given the following:
• Plant is in mode 1 at 100%
• Generator output is 800 MWe providing maximum MVARs per the generator
capability curve.
• Gas pressure is 75 psig.
Annunciator EK-0316 “GEN FIELD FORCING/OVEREXCITATION” is alarming.
Assuming that the operator has placed 390CS, “Voltage Regulator Control Switch” in
the TEST position, which of the following actions is required to correct the problem?
A. Decrease load on the Main Generator using the DEH System controls.
B. Use 390AC/CS, AC Adjuster, as appropriate to manually lower voltage.
C. Immediately trip the turbine with Unit Emergency Turbine Trip button.
D.Manually lower terminal voltage using 370DC/CS, DC Adjuster, as appropriate.

A

D.Manually lower terminal voltage using 370DC/CS, DC Adjuster, as appropriate.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

While synchronizing the Generator to the grid, the initial load circuit does not
automatically pick up 20 MW load when the first Generator output breaker is closed.
Which of the following describes the required operator action for this condition?
A. Trip the turbine.
B. Trip the Generator output breaker.
C. Trip the reactor.
D. Manually load the Generator to - 20MW.

A

D. Manually load the Generator to - 20MW.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

During a unit shutdown with the turbine being unloaded to

A

C. Manually trip the turbine.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

alarm annunciates:
EK-0107, “TURBINE NO LOAD PRETRIP”
Which of the following describes the appropriate operator response?
A. Manually trip the Reactor.
B. Manually trip the Main Turbine.
C. Close BOTH MSIVs.
D. Allow the Main Turbine to automatically trip.

A

B. Manually trip the Main Turbine.

17
Q

Main Generator System annunciator EK-0316 “GENERATOR FIELD
FORCING/OVEREXCITATION” has alarmed due to overexcitation.
Assuming no operator action, the NCO should observe that:
A. excitation current and voltage values are less than normal for Main Generator load.
B. the voltage regulator IMMEDIATELY shifts to manual control.
C. After apprx 33 seconds, the voltage regualtor shifts to manual and the Reactor trips 3 seconds after that, if the problem still exists.
D. the Main Generator, Main Turbine, and Reactor IMMEDIATELY trip when the alarm
sounds.
16

A

C. After apprx 33 seconds, the voltage regualtor shifts to manual and the Reactor trips 3 seconds after that, if the problem still exists.

18
Q

Which one of the following Main Generator protective relays is designed to protect
against operating the Main Generator as a motor?
A. Field Forcing
B. Underexcitation
C. Reverse Power
D. Voltage Balance

A

C. Reverse Power

19
Q

Given the following:
• Plant is in mode 1 at 100%
• Generator output is 800 MWe providing maximum MVARs per the generator
capability curve .
•. Gas pressure is 75 psig.
Annunciator EK-0316 “GEN FIELD FORCING/OVEREXCITATION” is alarming.
Assuming that the operator has placed 390CS, “Voltage Regulator Control Switch” in
the TEST position, which of the following actions is required to correct the problem?
A. Decrease load on the Main Generator using the DEH System Controls
B. Use 390 AC/CS, AC adjuster, as appropiate to manually lower voltage
C. Immediately trip the Turbine with Unit Emergency Trip button.
D. Manually lower terminal voltage using the 370 DC/CS, DC adjuster as appropiate.

A

D. Manually lower terminal voltage using the 370 DC/CS, DC adjuster as appropiate

20
Q

Given the following conditions:
• The plant is at 100% power.
• All control systems in AUTO.
• The Main Turbine Generator has tripped due to a “Generator Neutral
Overvoltage” condition.
Assuming no operator action, which ONE (1) of the following describes the secondary
plant response immediately following the plant trip?
A. Atmospheric Dump Valves modulate open, FWRVs remain “as is”, and Moisture Seperator/Reheater Steam Control Valve close.
B. MS Safety valves modulate, feedwater control system closes FWRVs, annd MSIV closes.
C. Feedwater control system closes Feeds S/Gs to high level override setpoint, MSIV close, and Moisture Separator/Reheater Steam Control valves close.
D. MS safety valves lift, Feedwater control system feeds S/G to high level override setpoint, and Turbine Bypass valves remain closed.

A

A. Atmospheric Dump Valves modulate open, FWRVs remain “as is”, and Moisture Seperator/Reheater Steam Control Valve close

21
Q

What effects could repeated reduction in hydrogen purity have on the operation of the
Main Generator?
A. The Main Generator gas pressure will need to be reduced below 60 psig due to the
decrease in the heat removal capability of the hydrogen.
B. The reduction in hydrogen purity may result in increased end turbine vibration levels and elevated generator temperatures.
C. Contaminants will buildup in the hydrogen seal oil system causing a loss of
lubrication to the generator seals and possible increased seal leakage.
D.Operation with low hydrogen purity will cause increased wear on the hydrogen
blower leading to eventual failure.

A

B. The reduction in hydrogen purity may result in increased end turbine vibration levels and elevated generator temperatures

22
Q

Which of the following describes the purpose of the physical interface between the
Instrument Air System and the Main Generator System?
A. The Main Generator uses Instrument Air to test for leakage past the Generator seals during generator overhaul.
B The Isophase Bus Duct coolers use Instrument Air to remove condensation from
the bus ducts prior to generator startup.
C.C02 is purged from the Main Generator using Feed Water Purity Instrument Air
prior to opening the generator.
D Plant Instrument Air may be used as a backup cooling gas for the Main Generator
during emergencies.

A

A. The Main Generator uses Instrument Air to test for leakage past the Generator seals during generator overhaul.

23
Q

The (1) is used to adjust
Generator terminal voltage.
(2) in order to control Main

 (1)                    (2)
A. DC adjuster    Exciter Voltage
B. Voltage Regulator  DC Adjuster
C. Exciter            Voltage Regulator output
D. DC Adjuster    Exciter Current
A

D. DC Adjuster Exciter Current

24
Q

Which one of the following Main Generator protective relays is designed to protect
against operating the Main Generator as a motor?
A. Field Forcing
B. Underexcitation
C.Reverse Power
D. Voltage Balance

A

C.Reverse Power

25
Q

Main Generator System annunciator EK-0316 “GENERATOR FIELD
FORCING/OVEREXCITATION” has alarmed due to overexcitation.
Assuming no operator action, the NCO should observe that:
A. excitation current and voltage values are less than normal for Main Generator load.
B. the voltage regulator IMMEDIATELY shifts to manual control.
C. AFTER - 33 sec. the voltage regulator shifts to manual, AND the reactor trips 3
seconds after that, if the problem still exists.
D. the Main Generator, Main Turbine, and Reactor IMMEDIATELY trip when the alarm
sounds.

A

C~ AFTER - 33 sec. the voltage regulator shifts to manual, AND the reactor trips 3
seconds after that, if the problem still exists.

26
Q

The plant is in Mode 1 at full power.
Which of the following describes the actions required to reduce generator excitation
when annunciator EK-0316 “GEN FIELD FORCING/OVEREXCITATION” alarms?
A. Decrease load on the Main Generator using the DEH System controls.
B. Call the Area Power Control to reduce grid voltage to correct the problem.
C. Use the AC Adjuster or DC adjuster, as appropriate, to manually lower voltage.
D. Use the AC adjuster to manually reduce voltage with the voltage regulator switch in
TEST.

A

C. Use the AC Adjuster or DC adjuster, as appropriate, to manually lower voltage.

27
Q

While synchronizing the Generator to the grid, the initial load circuit does not
automatically pick up 20 MW load when the first Generator output breaker is closed.
Which of the following describes the required operator action for this condition?
A. Trip the turbine.
B. Trip the Generator output breaker.
C. Trip the reactor.
D. Manually load the Generator to approximately 20 MW.

A

D. Manually load the Generator to approximately 20 MW.

Test 4 (7 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions