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WorksheetsBOT Exam 6 Review
Total questions: 103
Worksheet time: 5hrs 9mins
Scintillation detectors convert radiation energy into light by a process known as...
gas amplification.
space charge effect.
luminescence.
photoionization.
Most of the electrons collected in a fission chamber are released as a result of ionizations caused directly by...
fission fragments.
fission gammas.
fission betas.
fissionable materials.
Which one of the following describes the reason for the high sensitivity of a Geiger-Mueller tube radiation detector?
Changes in applied detector voltage have little effect on detector output.
Geiger-Mueller tubes are thinner than other radiation detector types.
Any incident radiation event causing primary ionization results in ionization of the entire detector
gas volume.
Geiger-Mueller tubes are operated at relatively low detector voltages, allowing detection of low
energy radiation.
A gas-filled radiation detector operating in the ion chamber region is exposed to a gamma radiation field. If the gamma radiation field remains constant while the detector’s applied voltage is increased but kept within the ion chamber region, the detector’s output will…
increase, because of an increase in secondary ionizations.
remain the same, because detector’s output is not affected by a change in voltage in this region.
increase, because of a decrease in the recombination of primary ions.
remain the same, because the detector is already producing its maximum output.
Which one of the following materials is typically installed inside an ion chamber detector that is used for reactor power indication?
Polyethylene
Boron-10
Uranium-238
Rhodium-103
In a gas-filled radiation detector operating in the proportional region, essentially __________ of the ions caused by incident radiation are collected; and the number of ions collected from secondary ionizations is __________ the applied voltage.
all; independent of
none; related to
all; related to
none; independent of
Which one of the following features is typically used to enhance thermal neutron detection in a gas-filled detector?
Encapsulate the detector in polyethylene.
Encapsulate the detector in boron-10.
Line the inside of the detector with polyethylene.
Line the inside of the detector with boron-10.
Which one of the following is a characteristic of Geiger-Mueller tube radiation detectors?
They can discriminate between neutron and gamma radiation.
They can discriminate between gammas of differing energies in the MeV range.
They provide an output that is inversely proportional to the applied voltage within the
Geiger-Mueller region.
They undergo maximum gas amplification whenever an ion is formed in the tube.
Which one of the following lists the two types of gas-filled radiation detectors whose outputs will be least affected by a small variation (±10 volts) in the voltage applied to the detectors? (Assume the applied voltage remains within normal range.)
Limited proportional and Geiger-Mueller
Ion chamber and proportional
Proportional and limited proportional
Geiger-Mueller and ion chamber
Which one of the following describes a characteristic of a Geiger-Mueller radiation detector?
Radiation types can be identified by pulse height and duration.
Specific radionuclides can be identified with the use of gamma spectrometry.
Small variations in applied voltage will result in large changes in detector output.
Any type of radiation that ionizes the detector gas will produce the same magnitude detector output
pulse.
A Geiger-Mueller radiation detector is located in a radiation field consisting of beta, gamma, and fast neutron radiation. Assuming each type of radiation enters the detector gas chamber and ionizes the detector gas, which one of the following describes the resulting detector pulse sizes?
Beta radiation will produce a larger pulse size than either gamma or fast neutron radiation.
Gamma radiation will produce a larger pulse size than either beta or fast neutron radiation.
Fast neutron radiation will produce a larger pulse size than either beta or gamma radiation.
Beta, gamma, and fast neutron radiation will produce pulse sizes that are equal in magnitude.
A gas-filled radiation detector operating in the proportional region is exposed to a constant gamma radiation field. If the applied voltage is increased but maintained within the proportional region, the rate of ion collection will...
increase, because more secondary ionizations are occurring in the detector.
increase, because fewer primary ions are recombining in the detector prior to reaching the
electrodes.
stay approximately the same, because the ion chamber is operating at saturated conditions.
stay approximately the same, because all of the primary ions were already being collected at the
lower voltage.
What is the function of the positive electrode in an ion chamber?
Produce ions when exposed to a radiation field.
Release electrons to combine with positive ions.
Perform gas quenching to maximize detector sensitivity.
Collect the electrons released during gas ionization.
A gas-filled radiation detector operating in the ion chamber is exposed to a constant gamma radiation field. If the applied voltage is increased but maintained within the ion chamber region, the rate of ion collection will...
increase, because more secondary ionizations are occurring in the detector.
stay approximately the same, because all of the primary ions were already being collected at the
lower voltage.
increase, because fewer primary ions are recombining in the detector prior to reaching the
electrodes.
stay approximately the same, because the ion chamber is operating at saturated conditions.
A gas-filled radiation detector operating in the proportional region is exposed to a constant gamma radiation field. If the applied voltage is decreased but maintained within the proportional region, the rate of ion collection will...
stay approximately the same, because all primary ions are collected as long as detector voltage
remains in the proportional region.
stay approximately the same, because the detector is still operating at saturated conditions.
decrease, because a decreased space charge around the positive electrode reduces gas
amplification.
decrease, because fewer secondary ionizations are occurring in the detector.
Which one of the following describes the reason for the high sensitivity of a gas-filled radiation detector operating in the Geiger-Mueller region?
Any radiation-induced ionization results in a large detector output pulse.
Geiger-Mueller detectors are longer than other types of radiation detectors, resulting in greater
detector surface area.
The detector output is inversely proportional to the applied voltage within the Geiger-Mueller
region.
High detector voltage allows differentiation between the various radiation types.
A beta particle and an alpha particle enter and cause ionization in a gas-filled radiation detector operating in the Geiger-Mueller region. Which one of the following accurately compares the amplitude of the detector pulses caused by each type of radiation?
The beta particle pulse will be larger in amplitude.
The alpha particle pulse will be larger in amplitude.
The pulses will be the same for both types of radiation.
Cannot be determined without particle kinetic energy information.
Which one of the following contains the pair of radiation detector types that are the most sensitive to low-energy beta and/or gamma radiation?
Geiger-Mueller and scintillation
Geiger-Mueller and ion chamber
Ion chamber and scintillation
Ion chamber and proportional
To completely deenergize an electrical component and its associated control and indication circuits, the component breaker should be...
open with the control switch in Pull-To-Lock.
open with the control switch tagged in the open position.
racked out and tagged in the racked-out position.
racked out with control power fuses removed.
Which one of the following describes the normal operation of a local breaker overcurrent trip flag indicator?
Actuates when no lockout is present; satisfies an electrical interlock to remotely close a breaker.
Actuates when a breaker overcurrent trip has occurred; can be manually reset when the overcurrent
condition clears.
Actuates when a breaker has failed to trip on an overcurrent condition; can be manually reset when
the overcurrent condition clears.
Actuates to cause a breaker trip when the overcurrent trip setpoint is reached; can be remotely reset
when the overcurrent condition clears.
Which one of the following describes the local overcurrent trip flag indicators for a breaker?
They actuate prior to breaker tripping to warn of imminent protective action.
They indicate breaker overcurrent trip actuation during and after breaker trip actuation.
When actuated, they indicate that the associated breaker has failed to trip open.
When actuated, they indicate that the breaker overcurrent trip relay has been reset.
Loss of breaker control power will cause...
breaker line voltage to indicate zero regardless of actual breaker position.
the remote breaker position to indicate open regardless of actual breaker position.
inability to operate the breaker locally and remotely.
failure of the closing spring to charge following local closing of the breaker.
Which one of the following results from a loss of control power to a breaker supplying a large motor?
The motor ammeter indication will be zero regardless of actual breaker position.
The breaker will trip open due to the actuation of its protective trip device.
The breaker position will remotely indicate closed regardless of actual position.
The breaker charging motor will not recharge the closing spring after the breaker closes.
Which one of the following will cause a loss of ability to remotely trip a breaker and a loss of remote breaker position indication?
Failure of the breaker control switch.
Racking the breaker to the TEST position.
Mechanical binding of the breaker tripping bar.
Loss of control power for the breaker.
A typical 120 VAC manual circuit breaker tripped due to overload. To close this circuit breaker, the handle must be moved from the...
OFF position directly to the ON position; trip latch reset is not required.
midposition directly to the ON position; trip latch reset is not required.
OFF position to the midposition to reset the trip latch, and then to the ON position.
midposition to the OFF position to reset the trip latch, and then to the ON position.
A 480 VAC motor is supplied power via an electrical disconnect in series with a breaker. Which one of the following describes the proper operations to isolate power to the motor?
Open the disconnect first, then the breaker.
Open the breaker first, then the disconnect.
Open the device that is closest to the motor first.
Open the device that is closest to the power source first.
Which one of the following is an unsafe practice if performed while working on or near energized electrical equipment?
Use insulated tools to prevent inadvertent contact with adjacent equipment.
Cover exposed energized circuits with insulating material to prevent inadvertent contact.
Attach a metal strap from your body to a nearby neutral ground to ensure that you are grounded.
Have a person standing by with the ability to remove you from the equipment in the event of an
emergency.
A main generator is being paralleled to an infinite power grid. Closing the output breaker of the generator with the frequency of the generator 0.1 Hz higher than grid frequency will result in the generator...
behaving as a real load to the grid.
behaving as a reactive load to the grid.
supplying a portion of the grid reactive load.
supplying a portion of the grid real load.
A main generator is about to be connected to an infinite power grid. Closing the generator output breaker with the generator voltage slightly lower than grid voltage and with generator frequency slightly higher than grid frequency will initially result in: (Assume no generator breaker protective trip occurs.)
the generator supplying reactive power to the grid.
the generator attaining a leading power factor.
the generator acting as a real load to the grid.
motoring of the generator.
A main generator is being paralleled to the power grid. Generator voltage has been properly adjusted and the synchroscope is rotating slowly in the clockwise direction.
The generator breaker must be closed just as the synchroscope pointer reaches the 12 o'clock position to prevent...
motoring of the generator, due to unequal frequencies.
excessive MW load transfer to the generator, due to unequal frequencies.
excessive MW load transfer to the generator, due to out-of-phase voltages.
excessive arcing within the generator output breaker, due to out-of-phase voltages.
During paralleling operations of the main generator to an infinite power grid, closing the generator output breaker with the frequency of the generator at 61 hertz and the grid frequency at 60 hertz will...
cause the generator to immediately increase load.
trip open the generator breaker on reverse power.
cause the generator voltage to increase.
cause the generator current to decrease.
Which one of the following evolutions will draw the highest current from the main generator during operation of the output breaker?
Opening the output breaker under full-load conditions.
Opening the output breaker under no-load conditions.
Closing the output breaker with voltages out of phase.
Closing the output breaker with voltages in phase.
A main generator is about to be connected to an infinite power grid. Closing the generator output breaker with generator and grid voltages matched, but with generator frequency lower than grid frequency will initially result in the generator...
picking up a portion of the grid real load.
picking up a portion of the grid reactive load.
experiencing reverse power conditions.
experiencing overspeed conditions.
A main generator is about to be connected to an infinite power grid. Closing the generator output breaker with the __________ of the generator higher than that of the grid will initially result in generator real load __________.
frequency; decreasing
frequency; increasing
voltage; decreasing
voltage; increasing
A main generator is about to be connected to an infinite power grid. Closing the generator output breaker with generator and grid voltages matched, but with generator frequency 0.1 Hz higher than grid frequency will initially result in the generator...
picking up a portion of the grid real load.
picking up a portion of the grid reactive load.
experiencing reverse power conditions.
experiencing overspeed conditions.
A main generator is being paralleled to an infinite power grid. Generator voltage has been properly adjusted and the synchroscope is rotating slowly in the counterclockwise direction.
If the generator breaker is closed just prior to the synchroscope pointer reaching the 12 o'clock position, which one of the following is most likely to occur?
The breaker will close and the generator will supply only MW to the grid.
The breaker will close and the generator will supply both MW and MVAR to the grid.
The breaker will close and then open due to overcurrent.
The breaker will close and then open due to reverse power.
A main generator is being connected to an infinite power grid. Which one of the following will occur if the generator output breaker is closed with generator frequency 0.1 Hz lower than power grid frequency? (Assume that no generator protection relay actuates.)
The generator will motorize.
The generator will accept too much load.
The voltage of the generator will decrease to compensate for the lower frequency.
The entire connected system will operate at the frequency of the lowest frequency (the oncoming)
generator.
A main generator is being prepared for paralleling with an infinite power grid. Which one of the following indicates that the main generator and grid voltages are in phase?
The synchroscope pointer is at the 12 o'clock position.
The frequency of the generator is equal to the frequency of the grid.
The synchroscope pointer is turning slowly in the clockwise direction.
The synchroscope pointer is turning slowly in the counterclockwise direction.
A main generator is about to be connected to an infinite power grid. Which one of the following conditions will cause the main generator to immediately supply reactive power (MVAR) to the grid when the generator output breaker is closed?
Generator voltage is slightly higher than grid voltage.
Generator voltage is slightly lower than grid voltage.
The synchroscope is turning slowly in the clockwise direction.
The synchroscope is turning slowly in the counterclockwise direction.
A main generator is about to be connected to an infinite power grid. Generator voltage equals grid voltage and the synchroscope is rotating slowly in the clockwise direction. The generator breaker is closed just as the synchroscope pointer reaches the 12 o'clock position.
Which one of the following will occur after the breaker is closed?
The breaker will remain closed and the generator will supply only MW to the grid.
The breaker will remain closed and the generator will supply both MW and MVAR to the grid.
The breaker will trip open due to overcurrent.
The breaker will trip open due to reverse power.
A main generator is being prepared for paralleling with an infinite power grid. Which one of the following indicates that the generator and grid voltages are in phase?
The voltage of the generator is equal to the voltage of the grid.
The frequency of the generator is equal to the frequency of the grid.
The synchroscope pointer is turning slowly in the clockwise direction.
The synchroscope pointer is passing through the 12 o=clock position.
A main generator is about to be connected to an infinite power grid. Generator voltage is slightly higher than grid voltage and the synchroscope is rotating slowly in the clockwise direction. The generator breaker is closed just as the synchroscope pointer reaches the 12 o'clock position.
Which one of the following will occur after the breaker is closed?
The breaker will remain closed and the generator will supply only MW to the grid.
The breaker will remain closed and the generator will supply both MW and MVAR to the grid.
The breaker will open due to overcurrent.
The breaker will open due to reverse power.
A main generator is being prepared for paralleling with an infinite power grid. At which one of the following synchroscope pointer positions is the main generator output voltage the farthest out of phase with the grid voltage?
3 o=clock
6 o=clock
9 o=clock
12 o=clock
A main generator is about to be connected to an infinite power grid. Generator voltage is equal to grid voltage and the synchroscope is rotating slowly in the counterclockwise direction. The generator breaker is closed just prior to the synchroscope pointer reaching the 12 o'clock position.
Which one of the following is most likely to occur after the breaker is closed?
The breaker will remain closed and the generator will supply only MW to the grid.
Thee breaker will remain closed and the generator will supply both MW and MVAR to the grid.
The breaker will open due to overcurrent.
The breaker will open due to reverse power.
When a typical 4,160 volt breaker is racked to the TEST position, control power is __________ the breaker; and the breaker is __________ the load.
removed from; isolated from
removed from; connected to
available to; isolated from
available to; connected to
Which one of the following statements describes the use of high-voltage disconnect switches?
Their use should be limited to normal load current interruption.
They may be used to isolate transformers in an unloaded network.
They trip open like circuit breakers, but must be manually closed.
They must be closed with caution when under load because of possible arcing.
The function of high-voltage disconnect switches is to provide __________ electrical isolation of equipment during __________ conditions.
manual; no-load
manual; overload
automatic; no-load
automatic; overload
High-voltage disconnect switches are used to...
adjust the output voltage range from a main power transformer.
protect bus feeder breakers by opening upon bus short-circuit faults.
provide equipment isolation under no-load conditions.
bypass and isolate an electrical bus while maintaining the downstream buses energized.
Which one of the following describes a characteristic of high-voltage disconnect switches?
They close automatically requiring no operator action.
They should not be used to interrupt a circuit under load.
They require a remote means of indication to determine actual position.
They should be connected so that they ground the supply bus prior to opening a circuit.
Typical high-voltage disconnect switches are designed to...
protect circuits during overcurrent conditions.
automatically trip open to protect breakers.
isolate equipment electrically during no-load conditions.
interrupt circuits under load.
Typical high-voltage transformer disconnect switches are designed to...
automatically protect the transformer from overcurrent conditions.
automatically trip open prior to transformer output breaker trip.
manually isolate the transformer during no-load conditions.
manually interrupt the transformer output circuit under any load when grounds are detected.
The following indications are observed in the control room for a normally-open motor control center (MCC) breaker that directly starts/stops a 480 VAC motor:
Red position indicating light is lit.
Green position indicating light is out.
Motor load current indicates 0 amps.
MCC voltage indicates 480 volts.
What is the condition of the breaker?
Open and racked in
Closed and racked in
Open and racked to the TEST position
Closed and racked to the TEST position
The following indications are observed in the control room for a normally-open breaker that directly starts/stops a 480 VAC motor:
Red position indicating light is lit.
Green position indicating light is out.
Load current indicates 50 amps.
Supply voltage indicates 480 volts.
What is the condition of the breaker?
Open and racked to the TEST position
Closed and racked to the TEST position
Open and racked in
Closed and racked in
While remotely investigating the condition of a normally-open breaker that feeds a motor control
center (MCC), an operator observes the following indications:
Green breaker position indicating light is out.
Red breaker position indicating light is lit.
MCC voltmeter indicates normal voltage.
MCC ammeter indicates zero amperes.
Based on these indications, the operator should report that the breaker is __________ and racked
__________.
open; in
closed; in
open; out
closed; out
While remotely investigating the condition of a normally-open 480 VAC motor control center (MCC)
feeder breaker, an operator observes the following indications:
Green breaker position indicating light is out.
Red breaker position indicating light is lit.
MCC voltmeter indicates 480 VAC.
MCC ammeter indicates zero amperes.
Based on these indications, the operator should report that the feeder breaker is __________ and
racked __________.
open; in
closed; in
open; to the TEST position
closed; to the TEST position
Breaker local overcurrent trip flag indicators, when actuated, indicate that...
a breaker trip will occur unless current is reduced.
a breaker overcurrent condition is responsible for a breaker trip.
an overcurrent condition has cleared and the breaker can be closed.
the associated breaker has failed to trip open during an overcurrent condition.
If the generator bearings on a motor-generator set begin to overheat from excessive friction, which one of the following will occur?
Generator current will begin to increase.
Generator windings will begin to heat up.
Motor current will begin to decrease.
Motor windings will begin to heat up.
A thermal overload device for a large motor protects the motor from...
sustained overcurrent by opening the motor breaker or motor line contacts.
sustained overcurrent by opening contacts in the motor windings.
instantaneous overcurrent by opening the motor breaker or motor line contacts.
instantaneous overcurrent by opening contacts in the motor windings.
Which one of the following will provide the initial motor protection against electrical damage caused by gradual bearing failure?
Thermal overload device
Overcurrent trip relay
Underfrequency relay
Undervoltage device
Thermal overload devices will provide the first electrical protection for a pump motor in the event of...
a locked rotor upon starting.
an electrical short circuit.
gradual motor bearing damage.
a sheared shaft during operation.
A main generator is connected to an infinite power grid. Which one of the following conditions will exist if the generator is operating underexcited?
Negative MVAR (VARs in) with a leading power factor
Positive MVAR (VARs out) with a leading power factor
Positive MVAR (VARs out) with a lagging power factor
Negative MVAR (VARs in) with a lagging power factor
The average starting current for a typical AC induction motor is approximately...
ten to fifteen times its normal running current.
five to seven times its normal running current.
two to three times its normal running current.
the same as its normal running current.
The starting current in a typical AC induction motor is usually much higher than the full-load running current because...
starting torque is lower than full-load running torque.
starting torque is higher than full-load running torque.
rotor speed during start is too low to generate significant counter electromotive force in the stator.
rotor current during start is too low to generate significant counter electromotive force in the stator.
Which one of the following describes the motor current indications that would be observed during the start of a large AC motor connected to a load?
Amps slowly increase to the normal operating value over a period of five time constants.
Amps immediately increase to the normal operating value and stabilize.
Amps immediately increase to many times the normal operating value and then decrease to the
normal operating value.
Amps immediately increase to the full-scale value and then decrease rapidly to zero due to
overload protection.
If the discharge valve of a large motor-driven centrifugal pump is kept closed during a normal pump start, the current indication for the AC induction motor will rise to...
approximately the full-load current value, and then decrease to the no-load current value.
approximately the full-load current value, and then stabilize at the full-load current value.
several times the full-load current value, and then decrease to the no-load current value.
several times the full-load current value, and then decrease to the full-load value.
Which one of the following is a characteristic of a typical AC induction motor that causes starting current to be greater than running current?
The rotor magnetic field induces an opposing voltage in the stator that is proportional to rotor
speed.
After the motor starts, resistors are added to the electrical circuit to limit the running current.
A large amount of starting current is required to initially establish the rotating magnetic field.
The rotor does not develop maximum induced current flow until it has achieved synchronous
speed.
The starting current in an AC motor is significantly higher than the full-load running current because...
little counter electromotive force is induced in the rotor windings during motor start.
motor torque production is highest during motor start.
little counter electromotive force is induced in the stator windings during motor start.
work performed by the motor is highest during motor start.
Starting current in an AC induction motor is typically __________ times the full-load running current.
1/4 to 1/2
2 to 3
5 to 7
10 to 12
Which one of the following describes the motor current during the start of a typical motor-driven radial-flow centrifugal pump with a closed discharge valve?
Current immediately increases to the full-load value and then gradually decreases to the no-load
value.
Current immediately increases to the full-load value and then stabilizes at the full-load value.
Current immediately increases to many times the full-load value and then rapidly decreases to the
no-load value after several seconds and then stabilizes.
Current immediately increases to many times the full-load value and then rapidly decreases to the
full-load value after several seconds and then stabilizes.
Which one of the following describes when the highest stator current will be experienced by an AC induction motor?
During motor operation at full load.
During motor operation at zero load.
Immediately after energizing the motor.
Immediately after deenergizing the motor.
To minimize the duration of high starting current, an AC induction motor should be started __________ to __________ the stator counter electromotive force.
unloaded; quickly establish
unloaded; delay
partially loaded; quickly establish
partially loaded; delay
What is the primary reason for limiting the number of starts for an electric motor in a given period of time?
Prevent overheating of the windings due to high starting currents.
Prevent overheating of the windings due to shorting within the stator.
Prevent rotor damage due to excessive cyclic stresses on the shaft.
Prevent rotor damage due to excessive axial displacement of the shaft.
The frequency of starts for large AC motors should be limited to prevent excessive...
heat buildup within the motor.
wear of pump thrust bearings.
torsional stresses on the motor shaft.
arcing and degradation of motor breaker contacts.
The number of starts for an electric motor in a given period of time should be limited because overheating of the __________ can occur due to the __________ counter electromotive force produced at low rotor speeds.
windings; low
windings; high
commutator and/or slip rings; low
commutator and/or slip rings; high
The frequency of start/stop cycles for an electrical motor is limited to prevent...
overheating the motor windings.
overheating the motor supply bus.
excessive shaft torsional stresses.
excessive cycling of the motor breaker.
Which one of the following is the primary reason for limiting the number of motor starts in a given time period?
Minimizes pitting of contacts in the motor breaker.
Prevents excessive torsional stresses on the motor shaft.
Prevents overheating of the motor windings.
Minimizes axial stresses on the motor bearings.
A large centrifugal pump is driven by a 200 horsepower AC induction motor. The motor breaker
control circuit contains the following protection devices: instantaneous overcurrent relay, motor thermal overload relay, control power fuses, and an anti-pumping device.
The pump had been manually started and stopped several times during a 5 minute period when the motor breaker tripped. Which one of the following is the most likely cause of the breaker trip?
Motor thermal overload.
Instantaneous overcurrent.
Blown control power fuse.
Anti-pumping device actuation.
The hypotenuse of the power triangle represents:
True power.
Reactive power
Apparent power.
Phase angle.
Voltage and current in an AC circuit are normally measured as __________ values.
peak
instantaneous
effective
average
Power factor is:
The cosine of the angle of lead or lag between current and voltage.
The sine of the angle of lead or lag between the current and voltage.
Equal to the apparent power divided by true power.
Equal to the true power divided by reactive power.
When a conductor is cutting the maximum lines of force:
Minimum voltage is generated.
Maximum voltage is generated.
Minimum current is generated.
Maximum conductor speed is reached.
Impedance is the combined effect of resistance, inductance, and __________.
magnetism
maximum voltage
effective current
capacitance
That portion of electrical power produced by the main generator and sent back to the plant for in-plant use is __________.
Vital Power
Essential Power
Auxiliary Power
Safeguards Power
An orderly means of connecting two or more electrical circuits together to distribute power describes __________.
circuit breakers
buswork
manual transfer switches
interlocks
The __________ I&C power system provides a source of reliable continuous power for safety related controls and instrumentation.
Vital
Essential
Auxiliary
Switchyard
Select the correct sequence from highest voltage to lowest voltage in a unit's electrical distribution system.
Load center, switchgear, motor control center
Switchgear, motor control center, load center
Motor control center, load center, switchgear
Switchgear, load center, motor control center
The __________ converts DC voltage into AC voltage to supply vital AC loads.
germanium rectifier
kirk key
static inverter
battery charger
A __________ is an electromagnetic device with one or more sets of contacts, that change position by the magnetic attraction of a coil to an armature.
diode
relay
battery
fuse
The relationship between a transformer's primary and secondary voltages is determined by the:
size of the bushings.
turns ratio of the transformer.
hysteresis loss ratio.
VA rating of the transformer core.
Which components isolate the transformer's connections from its grounded casing?
Grounding disconnects
Load tap changers
Bushings
Lightning arrestors
Why are transformer cores often laminated and insulated?
To provide structural strength.
To limit arcing when first energized.
To reduce eddy current losses.
To improve primary to secondary coupling.
Which type of transformer is used in circuits for voltage measurement and indication?
Potential
Current
Power
Auto
In an electrical transformer, the __________ winding is attached to the power source, while the__________ winding is attached to the load.
power; current
primary; secondary
potential; power
secondary; primary
A detector that is used as a source range nuclear instrument and who's output changes significantly as applied voltage is changed operates in the __________ region of the Gas Filled Detector Characteristic curve.
Ion Chamber
Recombination
Proportional
GeigerMueller
The purpose of the __________ is to provide continuous monitoring of radioactive liquid and gas discharges to the environment.
Area Radiation Monitoring System
Process Radiation Monitoring System
InCore Nuclear Instrumentation System
ExCore Nuclear Instrumentation System
Which component in a scintillation radiation detector provides an electrical signal proportional to the light intensity at the component?
phosphor crystal
photocathode
dynode
anode
__________ describes the effect of the magnetic field produced by the current flow in the armature windings in the main generator, which can offset, aid, or oppose the rotor field.
Magnetic induction
Armature losses
Field reaction
Armature reaction
Which one of the following should be performed to completely deenergize a circuit breaker including its control and indication power?
Open the breaker and tag it out.
Deenergize the breaker feeder bus.
Tag the control switch and post a watch at the breaker.
Open the breaker, pull the control power fuses, and rack out the breaker.
When a typical 4160 volt breaker is racked to the "Test" position, control power is __________ the breaker and the breaker is __________ the load.
available to; connected to
available to; isolated from
removed from; connected to
removed from; isolated from
High voltage electrical disconnects are used to ....
adjust the output voltage range from a main power transformer.
protect bus feeder breakers by opening upon bus shortcircuit failures.
provide equipment isolation under noload conditions.
bypass and isolate an electrical bus while maintaining the downstream buses energized.
A thermal overload device for a large motor protects the motor from...
an overfrequency condition.
instantaneous overcurrent by opening the motor breaker or motor line contacts.
a short circuit in the pump windings.
sustained overcurrent by opening contacts when the sensing element becomes too hot.
A relay scheme that must be reset manually after all other protective relay input signals are reset is:
an overcurrent relay.
a differential relay.
a line relay.
a lockout relay.
A relay that compares the input and output of a transformer is:
an overcurrent relay.
a differential relay.
a line relay.
a lockout relay.
