Term
If the contact resistance of a connection increases and the current of the circuit remains the same, the voltage dropped across the connection will ____.
a.increase
b.decrease
c.remain the same
d.cannot be determined |
|
Definition
|
|
Term
To double the current of a circuit when the voltage remains constant, the R (resistance) must be _____.
a.doubled
b.reduced by half
c.increased
d.none of these |
|
Definition
|
|
Term
An ohmmeter is being used to test a relay coil. The equipment instructions indicate that the resistance of the coil should be between 30 and 33 ohms. The ohmmeter indicates the actual resistance is less than 22 ohms. This reading would most likely indicate _____.
a.the coil is okay
b.an open coil
c.a shorted coil
d.a meter problem |
|
Definition
|
|
Term
The energy consumed by a 5 ohm resistor is ____ than the energy consumed by a 10 ohm resistor, assuming the current in both cases remains the same.
a.more
b.less |
|
Definition
|
|
Term
A 120V rated toaster will produce ____ heat when supplied by 115V.
a.more
b.less
c.the same
d.none of these |
|
Definition
|
|
Term
When a 100W, 115V lamp operates at 230V, the lamp will consume approximately _____.
a.150W
b.300W
c.400W
d.450W |
|
Definition
c. 400w
E^2 / p
15^2 / 100 = 132.25
230^2 / 132.25 = 400W |
|
|
Term
A parallel circuit has two or more paths in which current can flow.
a.true
b.false |
|
Definition
|
|
Term
In a parallel circuit, the voltage drop across each resistance is equal to the sum of the voltage drop each resistor in parallel.
a.true
b.false |
|
Definition
|
|
Term
According to Kirchoff's current law, the total current provided by the source to a parallel circuit equals the sum of the currents of all the branches.
a.true
b.false |
|
Definition
|
|
Term
In a parallel circuit, the total resistance is always greater than the smallest resistance.
a.true
b.false |
|
Definition
|
|
Term
A series circuit has four 40 ohm resistors and the power supply is 120V. The voltage drop of each resistor will be ____.
a.1/4 of the source voltage
b.30V
c.the same across each resistor
d.all of these |
|
Definition
a. all of these
*If you do the math its 30V |
|
|
Term
The power consumed in a series circuit is ____.
a.the sum of the power consumed of each load
b.determined by the formula PT=I^2 x RT
c.determined by the formula PT=E x I
d.all of these |
|
Definition
|
|
Term
A single phase, dual rated, 120/240V motor will have its winding connected in ____ when supplied by 120V.
a.series
b.parallel
c.series-parallel
d.parallel-series |
|
Definition
|
|
Term
When a magnetic field moves through a coil of wire, the lines of force of the magnetic field cause the in wire to flow in a specific direction. When the magnetic field moves in the opposite direction, electrons in the wire flow in the opposite direction.
a.true
b.false |
|
Definition
|
|
Term
Output voltage of a generator depends upon the ____.
a.number of turns of the wire
b.strength of the magnetic field
c.speed at which the coil rotates
d.all of these |
|
Definition
|
|
Term
The waveform for ac circuits displays the
level and direction of the current and voltage for every instant of time for one full revolution of the rotor.
a.true
b.false |
|
Definition
|
|
Term
The number of complete waveforms in one second is called the frequency. The frequency is expressed as ___ or cycles per second.
a.degrees
b.a sine wave
c.phase
d. hertz |
|
Definition
|
|
Term
If the voltage waveform finishes before the current waveform, the voltage is said to ____ the current waveform.
a.lead
b.lag
c.be in-phase-with
d.none of these |
|
Definition
|
|
Term
When the current waveform finishes before the voltage waveform, the voltage is said to _____ the current waveform.
a.lead
b.lag
c.be in-phase-with
d.none of these |
|
Definition
|
|
Term
____ is a property of an electrical circuit that enables it to store electrical energy by means of an electric field and to release this energy at a later time.
a.capacitance
b.induction
c.self-induction
d.none of these |
|
Definition
|
|
Term
A capacitor is a device that resists changes in current. Because a capacitor introduces reactance to the circuit, it shifts the current waveform to ____.
a.lead the applied voltage by 90 degrees
b.lag the applied voltage by 90 degrees
c.lead the applied voltage by 180 degrees
d.lag the applied voltage by 180 degrees |
|
Definition
| a. lead the applied voltage by 90 degrees |
|
|
Term
The opposition offered to the flow of ac current by a capacitor is called capacitive reactance, which is expressed in ohms and abbreviated ____.
a.XC
b.XL
c.Z
d.none of these |
|
Definition
|
|
Term
When electrons move, the magnetic fields of the individual electrons combine to produce an overall magnetic field. Eht greater than the current flow, the greater the overall magnetic field around the conductor.
a.true
b.false |
|
Definition
|
|
Term
When alternating current increases, the polarity of the CEMF within the conductor tries to prevent current from increasing.
a.true
b.false |
|
Definition
|
|
Term
When alternating current decreases, the polarity of the induced voltage within the conductor tries to prevent the current from decreasing.
a.true
b.false |
|
Definition
|
|
Term
Conductor resistance is directly proportional to the conductor's length and cross sectional area.
a.true
b.false |
|
Definition
|
|
Term
For ac circuits, the ____ of a conductor oppose(s) the current flow in the circuit.
a.Eddy currents
b.Skin effect
c.Resistance
d.All of these |
|
Definition
|
|
Term
Eddy currents are small independent currents induced within the conductor because of direct current.
a.true
b.false |
|
Definition
|
|
Term
The magnitude of seld-induced voltage within a winding is directly proportional to the current flow, the winding, and the frequency at which magnetic fields cut through the winding.
a.true
b.false |
|
Definition
|
|
Term
Self induced voltage opposes the change in current flowing in the conductor. This called inductive reactance and is abbreviated _____.
a.XL
b.XC
c.Z
d.None of these |
|
Definition
|
|
Term
If you measure voltage and current in an inductive or capacitive circuit and the multiply them together, you obtain the circuit's ___.
a.true power
b.power factor
c.apparent power
d.none of these |
|
Definition
|
|
Term
True power of an ac circuit equals volts times amperes.
a.true
b.false |
|
Definition
|
|
Term
A waveform represents _____.
a.the magnitude and direction of current or voltage.
b.how current or voltage can vary with time
c.how output voltage can vary with the generator armature
d.all of these |
|
Definition
|
|
Term
The frequency of an ac waveform is the number of times the current of voltage goes through 360 degrees in ____.
a.1/10 second
b.1 second
c.5 seconds
d. 30 seconds |
|
Definition
|
|
Term
120V is the reading shown on a voltmeter. This is an indication of the ____ value of the voltage source.
a.average
b.peak
c.effective
d.instantaneous |
|
Definition
|
|
Term
In a circuit that has only capacitive reactance, the voltage and current are said to be out-of-phase to each other because the voltage ___.
a.leads the current by 90 degrees
b.lags the current by 90 degrees
c.leads the current
d.none of these |
|
Definition
| b. lags the current by 90 degrees |
|
|
Term
Resonance occurs when ____.
a.Only resistance occurs in the system
b.the power factor is equal to zero
c.XL=XC
d.R=Z |
|
Definition
|
|
Term
Capacitive reactance is measured in ____.
a.ohms
b.volts
c.watts
d.henrys |
|
Definition
|
|
Term
Inductive reactance is abbreviated as ____.
a.I^2XR
b.LX
c.XL
d.Z |
|
Definition
|
|
Term
Inductive reactance is measured in ___.
a.farads
b.watts
c.ohms
d.coulombs |
|
Definition
|
|
Term
The total opposition to current flow in an ac circuit is expressed in ohms and is called _____.
a.impedance
b.conductance
c.reluctance
d.none of these |
|
Definition
|
|
Term
Conductor resistance to ac flow is _____ resistance to dc.
a.higher than
b.lower than
c.the same as
d.none of these |
|
Definition
|
|
Term
If you multiply the voltage by the current in an inductive or capacitive circuit the answer will be the ____ of the circuit.
a.watts
b.true power
c.apparent power
d.all of these |
|
Definition
|
|
Term
If the speed of a shunt-wound dc motor begins to increase, the armature cuts through the electromagnetic field at an increasing rate. This results in a greater armature CEMF, which acts to cut down on the increased armature current, resulting in the motor speeding up.
a.true
b.false |
|
Definition
|
|
Term
Placing a load on a shunt-wound dc motor causes the motor to slow down, which increases the rate at which the field flux lines are cut by the armature. As a result, the armature CEMF increases resulting in an increase in the applied armature voltage and current. The increase in current results in increased motor speed.
a.true
b.false |
|
Definition
|
|
Term
To reverse the rotation of a dc motor, you must reverse the ____.
a.stator field
b.rotor field
c.A & B
d.A or B |
|
Definition
|
|
Term
Swapping ____ of the line conductors can reverse a three phase ac motor's rotation.
a.one
b.two
c.three
d.four |
|
Definition
|
|
Term
Autotransformers use separate windings for the primary and secondary.
a.true
b.false |
|
Definition
|
|
Term
As current flows through the transformer, the iron core is temporarily magnetized. The energy required to realign the core molecules to the changing electromagnetic field is called _____.
a.conductor resistance
b.flux leakage
c.eddy currents
d.hysteresis loss |
|
Definition
|
|
Term
A ______ is used to raise or lower voltage and it has the ability to transfer electrical energy from one system to another with no physical connection between the two systems.
a.capacitor
b.motor
c.relay
d.transformer |
|
Definition
|
|
Term
The transformer winding that is connected to the source is called the ____ winding and the transformer winding that is connected to the load is called the ____.
a.secondary, primary
b.primary, secondary
c.depends on the wiring
d.none of these |
|
Definition
|
|
Term
If the primary phase voltage is 480V and the secondary phase voltage is 240V, the turns ratio is ____.
a.1:4
b.1:2
c.2:1
d.4:1 |
|
Definition
|
|
Term
Transformers are related in ____.
a.henrys
b.kW
c.W
d.kVA |
|
Definition
|
|
Term
If two line (supply) leads of a dc series motor are reversed, the motor will _____.
a.not run
b.run backwards
c.run the same as before
d.become a generator |
|
Definition
| c. run the same as before |
|
|
Term
To reverse a dc series motor, we may simply reverse the supply (power) leads.
a.true
b.false |
|
Definition
|
|
Term
The _____ induction motor is use only in special applications and is always operated on three phase ac power.
a.compound
b.synchronous
c.split phase
d.wound rotor |
|
Definition
|
|
Term
The rotating part of a dc motor or generator is called the ____.
a.shaft
b.rotor
c.armature
d.B or C |
|
Definition
|
|
Term
A transformer winding has a voltage turns ratio of 2:1, the current flowing through the secondary winding will be _____ the current flowing through the primary winding.
a.higher than
b.lower than
c.the same as
d.none of these |
|
Definition
|
|
Term
If a transformer primary winding has 900 turns and the secondary winding has 90 turns, which winding of the transformer has a larger conductor in cross sectional area?
a.primary
b.secondary
c.interwinding
d.autowinding |
|
Definition
|
|
Term
When a raceway does not exceed 24 in. in length, the raceway is permitted to be filled to ____ percent of its cross section area.
a.31
b.40
c.53
d.60 |
|
Definition
|
|
Term
The number of conductors permitted in a raceway is dependent on ___.
a.area of the raceway
b.percent area fill as listed in chapter 9, table 1
c.area of the conductors as listed in chapter 9, tables 5 and 8
d.all of these |
|
Definition
|
|
Term
Which of the following statements are true for a 10 hp, 208V, three phase motor with a nameplate current of 29A?
a.the branch circuit conductors can be 8 THHN.
b.overload protection is 33A
c.short circuit and ground fault protection can be an 80A circuit breaker
d.all of these |
|
Definition
|
|
Term
Conductor resistance is determined by ____.
a.material type
b.cross sectional area
c.conductor length
d.all of these |
|
Definition
|
|
Term
Conductor cross sectional area is expressed in AWG or ____.
a.square inches
b.mils
c.circular mils
d.none of these |
|
Definition
|
|
Term
The resistance of a conductor is directly proportional to its length.
a.true
b.false |
|
Definition
|
|
Term
_____ currents are small independent currents that are produced as a result of the expanding collapsing magnetic field. They flow erratically within the conductor opposing current flow.
a.lenz
b.ohm's
c.eddy
d.kirchoff's |
|
Definition
|
|
Term
The expanding and collapsing magnetic field induces a counter voltage within the conductors, which repels the flowing electrons toward the conductor surface. This is known as ____ effect.
a.inductive
b.skin
c.surface
d.watt |
|
Definition
|
|
Term
The opposition to current flow is greater for ac circuits than for dc circuits because of _____.
a.eddy currents
b.skin effect
c.inductive reactance
d.all of these |
|
Definition
|
|
Term
What kind of motor tends to run away if not always connected to a load?
a.dc shunt
b.dc series
c.ac synchronous
d.ac series |
|
Definition
|
|
Term
What kind of motor tends to run away if not always connected to a load?
a.applied voltage
b.power
c.applied torque
d.motor speed |
|
Definition
|
|
Term
This type of motor can operate on both AC and DC, and is commonly used in power drills, vacuum cleaners and other household items.
a.ac motor
b.universal motor
c.dc shunt motor
d.wound rotor |
|
Definition
|
|
Term
The rating 1000 ohm, 10 watt is typical for what?
a.resistor
b.heater
c.receptacle
d.thhn wire |
|
Definition
|
|
Term
What are the nameplate amperes of a 20hp, 208V motor operating at 88% efficiency with a 90% power factor?
a.50A
b.58A
c.75A
d.80A |
|
Definition
|
|
Term
If two parallel conductors are connected at both ends the cross-sectional area becomes ____?
a.larger
b.smaller
c.does not matter |
|
Definition
|
|
Term
Capacitors are measured in?
a.henrys
b.farads
c.ohms
d.amps |
|
Definition
|
|
Term
If a coworker is burned by battery acid you should apply ____ to the wound.
a.water for 20 minutes
b.iodine
c.lye and a bandage |
|
Definition
|
|
Term
The resistance of copper wire is _____ proportional to its length and inversely proportional to its cross sectional area.
a.inversely
b.does not matter
c.directly
d.universally |
|
Definition
|
|
Term
What is the disadvantage of an autotransformer?
a.the windings are electrically isolated
b.the windings are not electrically isolated
c.loss of voltage
d.loss of current |
|
Definition
| b. the windings are not electrically isolated |
|
|
Term
| The most likely cause for current to vary in a circuit is ____? a.loss or poor connection b.change in voltage c.change in current d.insulation deterioration |
|
Definition
| a. loss or poor connection |
|
|
Term
What tool is used to measure specific gravity?
a.metter
b.ammeter
c.hydrometer
d.voltmeter |
|
Definition
|
|
Term
What type of wrench is not used to tighten rigid metal conduit?
a.strap wrench
b.box wrench
c.chain wrench
d.cooling the joint |
|
Definition
|
|
Term
When soldering conductor joints, what is flux used for?
a.heating the surface
b.joining the conductors
c.cleaning and preparing the surface
d.cooling the joint |
|
Definition
| c. cleaning and preparing the surface |
|
|
Term
When a resistive load is operated at a voltage 10% higher than the nameplate rating of the appliance, the appliance will ___?
a.blow up
b.use more power
c.draw a lower current
d.have a longer life |
|
Definition
|
|
Term
When using an ammeter the leads should be connected in ___ with the circuit.
a.parallel
b.series-parallel
c.series
d.parallel-series |
|
Definition
|
|
Term
The greater number of free electrons, the better the _____?
a.ampacity
b.conductivity
c.resistance
d.insulation life |
|
Definition
|
|
Term
A solderless connector ___ for two conductors without the need of any actual soldering.
a.protects the wire
b.establishes a connection
c.cleans the wire
d.heats the wire |
|
Definition
| b. establishes a connection |
|
|
Term
How can conductor voltage drop be reduced?
a.reduce the conductor resistance
b.increase the conductor size
c.decrease the conductor length
d.all of these |
|
Definition
|
|
Term
A flickering fluorescent bulb can _____?
a.melt the conductors
b.cause damage to the ballast
c.burn out the bulb
d.give the bulb longer life |
|
Definition
| b. cause damage to the ballast |
|
|
Term
What is the advantage of "S" type fuses?
a.quicker reaction
b.slower burn
c.cheaper cost
d.look prettier |
|
Definition
|
|
Term
The total opposition to current flow in an ac circuit is expressed in ohms and called _____.
a.impedance
b.conductance
c.reluctance
d.resistance |
|
Definition
|
|
Term
The part of wiring system past the last overcurrent protection device is called the ____ circuit?
a.branch
b.feeder
c.service
d.neutral |
|
Definition
|
|
Term
The part of the wiring system prior to the last overcurrent protection device is called the _____ circuit?
a.feeder
b.service
c.branch
d.load |
|
Definition
|
|
Term
The frequency of an ___waveform is the number of times a current goes 360 degrees in ____?
a.AC, 60 sec
b.AC, 1 sec
c.DC 60 sec
d.DC 1 sec |
|
Definition
|
|
Term
When a calculation results in a fraction of an ampere that is less than ____, that fraction is permitted to be dropped.
a.0.40
b.0.45
c.0.50
d.0.55 |
|
Definition
|
|
Term
When sizing the feeder or service, each dwelling unit must have a minimum feeder load of ____ for the two small appliances circuits.
a.1000VA
b.2000VA
c.3000VA
d.4000VA |
|
Definition
|
|
Term
The NEC requires a minimum of 3 VA for each square foot of living space for the required general lighting and general use receptacles for dwelling units. The dimensions for determining the area are computed from the outside of the building and do not include ____.
a.open porches
b.garages
c.spaces not adaptable for future use
d.all of these |
|
Definition
|
|
Term
The 3 VA for each square foot of living space for general lighting includes receptacles rated 20A, but not the small appliance or laundry circuit receptacles.
a.true
b.false |
|
Definition
|
|
Term
The NEC recognizes that the general lighting and receptacles, and small appliance and laundry circuits will not be on or loaded at the same time and permits a(n) ___ to be applied to the total of these loads.
a.demand factor
b.adjustment factor
c.correction factor
d.correction |
|
Definition
|
|
Term
The feeder or service calculated load for electric clothes dryers located in dwelling units must not be less than ____.
a.5,000W
b.the nameplate rating
c.A or B
d.the greater of a or b |
|
Definition
|
|
Term
A feeder or service dryer load is required even if the dwelling unit does not contain an electric dryer.
a.true
b.false |
|
Definition
|
|
Term
In a wye-configured transformer, the line voltage is the same as the phase (winding) voltage.
a.true
b.false |
|
Definition
|
|
Term
What is the general lighting load and general use receptacle load for a 2,100 sq. ft. home that has 74 receptacle outlets and nine recessed luminaires rated at 100W each?
a.2,100va
b.4,200va
c.6,300va
d.8,400va |
|
Definition
c. 6,300va
2,100 x 3 = 6,300va |
|
|
Term
What is the feeder or service calculated load for a 4kw dryer?
a.3kw
b.4kw
c.5kw
d.6kw |
|
Definition
c. 5kw
dryer load must not be less than 5,000 VA |
|
|
Term
What is the feeder or service calculated load for a 5.50 kw dryer?
a.3kw
b.4kw
c.5kw
d.5.50kw |
|
Definition
d. 5.50kw
dryer load must not be less than 5,000VA |
|
|
Term
What is the feeder or service calculated load for an 11.50 kw range?
a.7kw
b.8kw
c.9kw
d.10kw |
|
Definition
b. 8kw
table 220.55 column c |
|
|
Term
What is the calculated load for a 4.50kw dryer?
a.4.50kw
b.5kw
c.5.50kw
d.8kw |
|
Definition
b. 5kw
dryer must not be less than 5,000kw |
|
|
Term
How many 15A, 120V branch circuits are required for general use receptacles and lighting in a 1,800 sq.ft. dwelling unit?
a.1
b.2
c.3
d.4 |
|
Definition
c. 3
1,800 x 3 = 5,400
5,400 / 120 = 45
45 / 14 = 3 |
|
|
Term
A dwelling unit contains one of each of the following: dishwasher (1/2 hp) and water heater (4kva). What is the appliance calculated load for the dwelling unit?
a.4kva
b.5.10kva
c.9kva
d.11kva |
|
Definition
|
|
Term
A dwelling unit contains a 5.50 kw electric clothes dryer. What is the feeder calculated load for the dryer?
a.3.38kw
b.4.50kw
c.5kw
d.5.50kw |
|
Definition
d. 5.50kw
minimum of 5,000kw otherwise use nameplate |
|
|
Term
The maximum feeder calculated calculated load for an 8kw range is ___.
a.6.30kw
b.8kw
c.8.50kw
d.12kw |
|
Definition
|
|
Term
Each dwelling unit must have a feeder load consisting of ____ for a 20A laundry circuit.
a.1,500va
b.2,000va
c.3,000va
d.4,500va |
|
Definition
|
|
Term
A 1,500W resistive heater is rated 230V and is connected to a 208V supply. The power consumed for this load at 208V will be approximately ____.
a.1,225w
b.1,625w
c.1,750w |
|
Definition
|
|
Term
If a transformer is 97% efficient, for every 1kw input, there will be ____ output.
a.970w
b.1,000w
c.1,030w
d.1,200w |
|
Definition
a. 970w
1,000 x .97 = 970W |
|
|
Term
If the output power is 1,600w and the equipment is 88% efficient, what are the input amperes at 120V?
a.10A
b.15A
c.20A
d.25A |
|
Definition
b. 15A
16 x .88 = 14.08 -> 15A |
|
|
Term
Dual voltage ac motors are made with two field windings. The field windings are connected in ____ for low voltage operation and in ____ for high voltage operation.
a.series, parallel
b.parallel, series
c.series, series
d.parallel, parallel |
|
Definition
|
|
Term
For dual voltage 230/460V motor, the field windings are connected in parallel for ____ operation and in series for ___ operation.
a.230v, 460v
b.460v, 230v
c.230v, 230v
d.460v, 460v |
|
Definition
|
|
Term
Motors are used to convert electrical energy into mechanical work and the output mechanical work of a motor is rated in horsepower. 1hp = ____.
a.476w
b.674w
c.746w
d.840w |
|
Definition
|
|
Term
What is the cross sectional area in square inches for 10 THHN?
a.0.0117
b.0.0172
c.0.0211
d.0.0252 |
|
Definition
|
|
Term
How many 6 RHH conductors (without outer cover) can be installed in trade size 1 ¼ electrical nonmetallic tubing?
a.7
b.13
c.16
d.25 |
|
Definition
|
|
Term
Which of the following statements about a 30hp, 460V, three phase synchronous motor and a 10hp, 460V, three phase motor are true?
a.the 30 hp motor is supplied by 8awg conductors with an 80a breaker
b.the 10 hp motor is supplied by 14awg conductors with a 35A breaker
c.the feeder conductors must be 6awg conductors with a 90A breaker
d.all of these |
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An existing trade size ¾ rigid metal conduit nipple contains four 10 THHN conductors and one 10 AWG (bare stranded) ground wire. How many additional 10 THHN conductors can be installed?
a.5
b.7
c.9
d.11 |
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Where a circuit supplies continuous loads or any combination of continuous and noncontinuous loads, the rating of the overcurrent device must not be less than the noncontinuous load plus ____ of the continuous load.
a.80%
b.100%
c.125%
d.150% |
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How many 10awg conductors are permitted in a 4 x 1 ½ square box?
a.8
b.9
c.10
d.11 |
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A continuous load of 27A requires the circuit overcurrent device to be sized at ____.
a.20A
b.30A
c.35A
d.40A |
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What size overcurrent device is required for a 45A continuous load? The circuit is in a raceway with 14 current carrying conductors.
a.45A
b.50A
c.60A
d.70A |
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A 65A continuous load requires a ____ overcurrent protection device.
a.60A
b.70A
c.75A
d.90A |
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Motors with a nameplate temperature rise rating not over 40 c must have the overload protection device sized at no more than ____ percent of the motor nameplate rating.
a.100
b.115
c.125
d.135 |
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Motors with a nameplate service factor of 1.15 or more must have an overload protection device sized at no more than ____ percent of the motor nameplate current rating.
a.100
b.115
c.125
d.135 |
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Definition
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Motors that have a service factor rating of 1.10 must have the overload protection device sized at not more than ___ percent of the motor nameplate ampere rating.
a.100
b.115
c.125
d.135 |
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If dual-element fuse is used for overload protection, what size fuse is required for a 30hp, 460V, three phase synchronous motor, with a temperature rise of 39 C?
a.20A
b.25A
c.30A
d.40A |
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