(Closed Book Aid) Flashcards
What is the most frequent used wire size for interior wiring? (A)10 awg (B)12 awg (C)14 awg (D)18 awg
B
Electric power is almost exclusively generated, transmitted and distributed by three-phase systems because it ?.
(A)Costs Less than single-phase apparatus
(B)is more efficient
(C)uses less material for a given capacity
(D)all of these
D
An automatic device that operates at preset values is known as a ?. (A)Fuse (B)relay (C)Contactor (D)Mercury switch
B
Electron is a Greek word for ?. (A)Heat (B)Feather (C)Stone (D)Amber
D
What kind of instrument is an ammeter? (A)A recording (B)A DC meter (C)An indicating (D)An integrating
C
The purpose of battery cells connected in parallel is to ?. (A)Increase internal resistance (B)increase in voltage output (C)increase in current capacity (D)decrease in current capacity
C
The ? value is considered as the most important value of a sine wave. (A)peak (B)instantaneous (C)effective (D)average
C
When two resistances are connected in series, ?.
(A)voltage across them must be the same
(B)current in each resistor will be the same
(C)there will be no current in the circuit
(D)they will become inductive
B
A step-down transformer ?.
(A)increases both the voltage and current
(B)lowers the current and increases the voltage
(C)lowers the voltage and increases the current
(D)lower both the voltage and current
C
Heat is a form of wasted electrical energy dissipated by ?. (A)inductance (B)capacitance (C)a diode (D)resistance
D
When one resistance in a series circuit is open ?.
(A)the voltage is zero across the open resistance
(B)the current is zero in all the resistances
(C)the current is maximum in the normal resistances
(D)the current increases in the voltage source
B
A wire has a resistance of 5 ohms. what will the resistance of another wire of the same material three times as long and half the cross sectional area? (A)7.5 (B)15 (C)30 (D)50
C
if the needle of the VOM will no longer align with the zero-ohm mark at the lowest range of resistance but will align on the other resistance ranges, the probable cause is the ?. (A)meter current is abnormal (B)needle is bent (C)terminals were interchanged (D)supply battery is weak
D
A wattmeter measures ?. (A)AC power only (B)DC reactive power only (C)AC and DC power (D)None of these
C
A large series motor should not be started without some mechanical load on it because it will ?.
(A)Open the fuse or CB
(B)Draw too much current
(C)spark Heavily
(D)develop excessive speed and damage itself
D
Which of the following can vary with AC but not with DC? (A)Voltage (B)Frequency (C)Power (D)magnitude
B
an inductor works by?. (A)introducing resistance into a circuit (B)charging a piece of wire (C)storing energy as a magnetic field (D)choking off high frequency AC
C
A cell that can not be recharged is a ?. (A)Dry cell (B)Wet Cell (C)Secondary Cell (D)Primary Cell
D
A measuring instrument used to measure the diameter of circular mils in a wire is a ?. (A)wire gauge (B)micrometer (C)millimeter (D)milliammeter
B
The start winding of a split-phase induction motor is switched out of the circuit by a device called ?. (A)Proximity switch (B)zero speed switch (C)magnetic contactor (D)centrifugal switch
D
An ideal step-up transformer with 100 turns in the primary and 2500 turns in the secondary carries a load of 2 amps in the secondary windings. the current of the primary winding is ?. (A)25 (B)50 (C)250 (D)500
B
A device used to remove sharp burrs or rough edges is a ?. (A)hickey (B)bender (C)reamer (D)rotometer
C
The presence of current is only made known by the effect it produces. three important effects are ?.
(A)heating, magnetic, and chemical
(B)generation, chemical and electric shock
(C)heating, magnetic and electric shock
(D)heating, electric shock and generation
C
?. is a wiring method using knobs, tubes, and flexible non-metallic tubing for the protection and support of single insulated conductors concealed in hollow spaces of walls and ceilings of buildings (A)Knob and tube wiring (B)open wiring on insulators (C)open wiring with knobs, tubes, etc. (D)Concealed knob and tube wiring
D
A ? is not a standard size fuse. (A)45 (B)75 (C)80 (D)125
B
FILLER (A)FILLER (B)FILLER (C)FILLER (D)FILLER
FILLER
? currents are wasteful currents which flow in the core of the transformer and produce heat. (A)sneak (B)magnetizing (C)Eddy (D)residual
C
In electricity, the positive electric charge refers to ?. (A)atoms (B)electrons (C)neutrons (D)protons
D
The rate of doing work is ?. (A)power (B)current (C)energy (D)force
A
A transformer consists of ?. (A)a parallel resonant circuit (B)two coils wound on a common core (C)a capacitor and an inductor (D)an inductance and resistance
B
The effect of a discharge of electricity due to ionization of surrounding air by high voltage is (A)corona effect (B)hall effect (C)Compton effect (D)miller effect
A
An ammeter must always be connected in the circuit under test ?.
(A)positive to negative and negative to positive
(B)positive to positive and negative to positive
(C)positive to negative and negative to positive
(D)positive to positive and negative to negative
D
? is the poorest conductor of electricity (A)Steel (B)Aluminum (C)Silver (D)Carbon
D
A meter used to test the armatures and stators of electric motors, generators, and other equipment for a short circuit is called a ?. (A)multimeter (B)megohmeter (C)bolometer (D)growler
D
In a transformer, the primary circuit sees the impedance of the ? wiring. (A)secondary (B)primary (C)both primary and secondary (D)isolation
C
When the temperature of a conductor is decreased the resistance will be ?. (A)increases (B)steady (C)decreased (D)zero
C
? is the process by which one conductor produces or induces a voltage in another conductor even though there is no mechanical coupling between the two conductors (A)cutting of fluxes (B)short circuit (C)induction (D)Eddy current
C
A/an motor has no commutator (A)shunt (B)induction (C)universal (D)repulsion
B
The inert gas present in an incandescent bulb is primarily intended to ?.
(A)increase lumen output
(B)decrease filament evaporation
(C)activate the surface of the filament
(D)reduce hazards when the glass bulb is shattered
A
A short circuit can be detected by using (A)a megger (B)an ammeter (C)an oscilloscope (D)an ohmmeter
D
Which of the following has the least number of valance electrons? (A)insulator (B)semi-insulator (C)conductor (D)semiconductor
C
To increase voltage output, battery cells are connected in ?. (A)series (B)parallel (C)series-parallel (D)parallel-series
A
If a low resistance is connected in parallel with a higher resistance, the combined resistance is ?.
(A)always less than the low resistance
(B)always more than the high resistance
(C)always between the values of high and low resistance
(D)higher of lower than the low resistance depending on the value of the higher resistance
A
The purpose of a ballast in a fluorescent lamp assembly is ?.
(A)to regulate the lumens output
(B)to limit the current through the lamp
(C)to improve the overall power factor
(D)to regulate the voltage across the lamp
B
Branch circuits are classified according to the maximum ?. (A)power consumed (B)voltage across it (C)load being served (D)setting of the overcurrent device
D
A capacitor opposes change in ?. (A)current (B)voltage (C)voltage and current (D)neither voltage nor current
B
On a simple ohmmeter, the 0ohm mark is located ?. (A)in the middle (B)at the far left (C)at the far right (D)anywhere
C
Which of the following is the main function of a DC motor?
(A)To change mechanical energy to electrical energy
(B)to change electrical energy to mechanical energy
(C)to change chemical energy to mechanical energy
(D)to generate power
B
A short length of conductor used to make a connection between terminals or around a break in the circuit is a ?. (A)jumper (B)bonding wire (C)tie wire (D)guy wire
A
A fuse link should be made from a material with a ? melting point. (A)high (B)low (C)moderate (D)strong
B
Your foreman asked you to measure the insulation resistance of some conductors. To do this you would use a ?. (A)hydrometer (B)megger (C)bell tester (D)wattmeter
B
The main difference between a pipe thread and a machine thread is that the pipe thread is ?. (A)finer (B)longer (C)uneven (D)tapered
D
Receptacles in residential wiring are regularly connected in ?. (A)parallel (B)perpendicular (C)series (D)diagonal
A
A foreman in charge of a crew of men preparing to work on a low voltage tension circuit should caution them to ?.
(A)work only when the load is zero
(B)consider the circuit hot at all times
(C)never work on any circuit alone
(D)wait until the circuit has been killed
B
The term pneumatic refers to ?. (A)Electricity (B)Steam (C)Air (D)oil
C
what type of fastner would you use to mount a box to a hollow tile wall? (A)expansion bolts (B)toggle bolts (C)rawl plugs (D)bolts with backing plates
B
Which of the following locations would most likely require installation of a ground fault circuit interrupter? (A)Living room (B)closet (C)bedroom (D)bathroom
D
The lubricant used to make pulling wires through a conduit easier is ?. (A)grease (B)powdered pumice (C)vaseline (D)powdered soapstone
D
The instrument by which electric power is measure is a ?. (A)ammeter (B)rectifier (C)voltmeter (D)wattmeter
D
The connection between the grounded circuit conductor and the equipment grounding conductor at the service is called the ? bonding jumper (A)circuit (B)eequipment (C)main (D)appliance
C
The larger the conductor, the ?. (A)higher the resistance (B)lower the ampacity (C)higher the voltage (D)lower the resistance
D
A hook on the end of a fish tape is not to ?.
(A)keep it from catching on jointsd and bends
(B)tie a swab to
(C)tie the wires, top be pulled
(D)protect the end of the wire
D
FILLER (A)FILLER (B)FILLER (C)FILLER (D)FILLER
FILLER
When soldering two copper conductors together, they are kept clean while heating by ?.
(A)the use of flux
(B)applying the solder quickly
(C)rubbing often with emery cloth
(D)not permitting the open flame to touch them
A
Metal Cabinets used for lighting circuits are grounded to ?.
(A)reduce shock hazard
(B)eliminate electrolysis
(C)Assure that the fuse will blow in a defective circuit
(D)simplify the wiring
A
In sockets, extension cord is protected by the means of the ? knot. (A)underwriters (B)clove hitch (C)sheepshank (D)western union
A
A branch circuit that supplies a number of outlets for lighting and appliances is a/an ? branch circuit. (A)individual (B)multi-purpose (C)general purpose (D)utility
C
When three equal resistors are connected in parallel, the total resistance is ?. (A)equal to the resistance of each (B)less than any one resistor (C)greater then any one resistance (D)none of these
B
The efficiency of a motor is a measure of ?.
(A)the natural speed of the motor
(B)the torque the motor produces
(C)how well it converts electrical energy into mechanical energy
(D)the power output of the motor in horsepower
C
When stripping insulation from an aluminum conductor ?.
I. Remove the insulation as you would sharpen a pencil
II. ring the conductor and slip the insulation off the conductor
III. peel the insulation back and the cut outwards.
(A)I, II, and III
(B)I and II
(C)I and III
(D)II and III
C
The ? angle is the angle between the real power and the apparent power. (A)lag (B)power factor (C)voltage-current (D)watt
B
FILLER (A)FILLER (B)FILLER (C)FILLER (D)FILLER
FILLER
60 cycle frequency travels 180 degrees in how many seconds. (A)1/60 (B)1/120 (C)1/180 (D)1/30
B
The current-carrying capacity of conductors expressed in amperes is ?. (A)demand (B)pressure (C)ampacity (D)duty-cycle
C
The electricians tapered reamer is used for ?.
(A)reaming the threads on couplings
(B)reaming the holes in bushings
(C)reaming the ends of rigid conduit after it is cut
(D)making holes in boxes
C
Electricity is sold by the kilowatt which is ? watts. (A)10,000 (B)1,000 (C)100 (D)100,000
B
Three-way switching does not use the following conductor: (A)ungrounded (B)traveler (C)grounded (D)switch leg
C
The greater the number of free electrons, the better the ? of the metal (A)insulation value (B)resistance (C)voltage drop (D)conductivity
D
To cut Wiremold you would ?.
(A)use a chisel
(B)use an approved cutter like an M.M. cutter
(C)Use pair of tin snips
(D)use a hacksaw and remove the burr with a file
D
Electrical contacts are opened or closed when the electrical current energizes the coils of a device called a ?. (A)Thermostat (B)Reactor (C)condenser (D)Relay
D
A clamp-on ammeter will measure ?.
(A)voltage when clamped on a single conductor
(B)current when clamped on a multiconductor cable
(C)accurately only when a parallel to cable
(D)accurately when clamped perpendicular to a conductor
D
When a current leaves its intended path and returns to the source by bypassing the load the circuit ?. (A)open (B)shorted (C)incomplete (D)broken
B
The electric pressure or electromotive force is measure by the ?. (A)volt (B)electric meter (C)watt (D)kilowatt
A
Conduit installed in a concrete slab is considered a ?. (A)damp location (B)moist location (C)wet location (D)dry location
C
It is best as a safety measure, not use water to extinguish electrical equipment fires. The main reason is that water ?. (A)may transmit shock to the user (B)will turn to steam (C)will not put the fire out (D)may damage the wiring
A
The total opposition to current flow in an AC circuit is expressed in OHMS and is called ?. (A)impedance (B)conductance (C)reluctance (D)resistance
A
FILLER (A)FILLER (B)FILLER (C)FILLER (D)FILLER
FILLER
When a person is burned the basic care steps are ?. (A)cover and cool the burned area (B)prevent infection (C)care for shock (D)all of these
D
A multimeter is a combination of ?. (A)ammeter, ohmmeter, and wattmeter (B)voltmeter, ohmmeter, and ammeter (C)voltmeter, ammeter and megger (D)voltmeter, wattmeter and ammeter
B
A good magnetic material is ?. (A)brass (B)copper (C)iron (D)aluminum
C
Since fuses are rated by an amperage and voltage a fuse will work on ?. (A)AC only (B)AC and DC (C)DC only (D)Any voltage
B
A fuse puller is used in replacing ?. (A)Cartridge fuses (B)plug fuses (C)link fuses (D)ribbon fuses
A
A pendant fixture is a ?. (A)hanging fixture (B)recessed fixture (C)bracket fixture (D)none of these
A
To fasten an outlet box between the studs in a wall constructed of metal lath and plaster, you would use ?. (A)Cement or mortar (B)iron wire (C)nylon lath twine (D)an approved box hanger
D
The unit of measurement for electrical resistance to current is the ?. (A)watt (B)ohm (C)volt (D)amp
B
A low energy power circuit ?. (A)is a remote-control circuit (B)is a signal circuit (C)has its power supplied by transformers and batteries (D)none of these
C
To convert AC or DC you will use a ?. (A)generator (B)rectifier (C)vibrator (D)auto-transformer
B or D
S(Lower left 3) is a symbol used on a drawing to indicate a ? switch. (A)flush (B)single-pole (C)four-way (D)three-way
D
Action requiring personal intervention for its control: (A)controller (B)automatic (C)periodic duty (D)non-automatic
D
A voltmeter is connected in ?. with the load. (A)series (B)parallel (C)series-parallel (D)series-shunt
B
To control a ceiling light from five different locations it requires which of the following?
(A)four 3-way switches and one 4-way switch
(B)three 4-way switched and two 3-way switches
(C)three 3-way switched and 2 4-way switches
(D)four 4-way switched and one 3-way switch
B
The advantage of AC over DC includes which of the following? (A)better speed control (B)lower resistance at higher current (C)ease of voltage variation (D)impedance is greater
C
which of the following is considered the best electrical conductor? (A)iron wire (B)copper wire (C)aluminum wire (D)tin wire
B
the liquid in a battery is called the ?. (A)askeral (B)festoon (C)hermatic (D)electrolyte
D
A color code is used in multiple-conductor cables. for a 3-conductor cable the colors would be ?. (A)one black, one red and one white (B)two black and one red (C)one white, one black and one blue (D)two red nd one black
A
explanatory material in the code is characterized by ?. (A)Informational Note (B) (C) (D)
Informational Note
A ? box may be weather proof. (A)watertight (B)rainproof (C)raintight (D)all of these
D
The Code requires that all AC phase conductors where used, the neutral and all equipment grounding conductors be grouped together when using metal enclosures or raceways. The principal reason for this is ?.
(A)currents would circulate though individual raceways
(B)less expensive to install a single raceway
(C)lass labor hours for pulling wires in a single raceway
(D)conductors are easier to pull in a single raceway
A
Installing more than three current carrying conductors in the same conduit requires ?. (A)a larger conduit (B)high heat rated conductors (C)derating of ampacity (D)continuous loading
C
FILLER (A)FILLER (B)FILLER (C)FILLER (D)FILLER
FILLER
FILLER (A)FILLER (B)FILLER (C)FILLER (D)FILLER
FILLER
The ? circuit is that portion of a wiring system prior to the final overcurrent protective device protecting the circuit. (A)service (B)feeder (C)power (D)branch
B
When tightening a screw on a terminal, the end of the conductor should wrap around the screw in the same direction that you are turning the screw to that ?.
(A)when you pull in the conductor it will tighten
(B)the screw will not become loose
(C)the conductor will act as a locking nut
(D)the conductor will not turn off
D
FILLER (A)FILLER (B)FILLER (C)FILLER (D)FILLER
FILLER
A ? is used for testing specific gravity. (A)thermocouple (B)megger (C)hydrometer (D)galvanometer
C
An autotransformer differs from other types of transformations in that ?.
(A)its primary winding isd always larger than its secondary winding
(B)it can be used only in automobiles
(C)its primary and secondary windings are common to each other
(D)it must be would with heavier wire
C
In residential buildings, small appliance loads should have two or more ?/ (A)15 ampere branch circuits (B)20 ampere branch circuits (C)40 ampere branch circuits (D)50 ampere branch circuits
B
If the end of a cartridge fuse becomes warmer than normal, you should ?. (A)tighten the fuse clips (B)lower the voltage on the circuit (C)notify the utility company (D)change the fuse
A
Which of the following is the poorest conductor of electricity? (A)mercury (B)aluminum (C)carbon (D)silver
C
The primary winding of a loaded step-down transformer has ? compared to the secondary winding. (A)lower voltage and current (B)higher voltage and current (C)higher voltage and lower current (D)lower voltage and higher current
C
Copper is used for the tip of a soldering iron because
(A)copper will not melt
(B)copper is a very good conductor of heat
(C)solder will not stick to other alloys
(D)copper is less expensice
B
The sum of the voltage drop around a circuit is equal to the source voltage is ?. (A)Kirchoff's Law (B)Ohms Law (C)Nevins Theory (D)Faradays law
A
Piezoelectric is caused by crystals or binding ?. (A)Chemical (B)Battery (C)Pressure (D)Heat
C
Heavy-duty lampholder include ?.
(A)admedium lampholders rated at 660 watts
(B)lampholders used on circuits larger than 20 amperes
(C)lampholders rated at not less than 750 watts
(D)All of the above
D
The reason for installing electrical conductors in a conduit is ?.
(A)to provide a ground
(B)to increase the ampacity of the conductors
(C)to protect the conductors from damage
(D)to avoid derating for continuous loading of conductors
C
Discoloring of one end of a fuse normally indicates ?. (A)increased current (B)excessive voltage (C)low resistance (D)poor contact
D
Wing nuts are useful on equipment where ?. (A)cotter pins are used (B)the nuts must be removed frequently (C)a wrench cannot be used (D)screws cannot be used
B
When resistors are connected in series, the total resistance is ?.
(A)The sum of the individual resistance values
(B)the equivalent of the smallest resistance value
(C)the equivalent of the largest resistance value
(D)less then the value of the smallest resistance
A
If a 120 volt incandescent light bulb is operating at a voltage of 125 volts the result will be ?. (A)it may be enough to blow a fuse (B)the bulb won't be as bright (C)shorter life of the bulb (D)the wattage will be less than rated
C
laminations are used in the transformers to prevent ?. (A)copper loss (B)weight (C)eddy current loss (D)counter EMF
C
The Code requires which of the following colors for the equipment grounding conductor? (A)white or gray (B)green or green with yellow stripes (C)yellow (D)blue with a yellow stripe
B
Sometimes mercury toggle switches are used in place of regular toggle switch because they ?. (A)are easier to connect (B)do not wear out quickly (C)are less expensive (D)they glow in the dark
B
The assigned color for the high-leg conductor of three-phase, 4 wire-delta secondary is ?. (A)red (B)black (C)blue (D)orange
D
The Code rule for the maximum 90 degree bends in a conduit between two boxes is four, the most likely reason for the total 360 degree limitation is ?.
(A)it is unsafe
(B)it makes pulling the conductors through the conduit too difficult
(C)you can damage the galvanized coating on the conduit
(D)too many bends require extra wire to be pulled
B
The correct word to define wiring which is not concealed is ?. (A)open (B)uncovered (C)exposed (D)bare
C
A solenoid is a ?. (A)relay (B)permanent magnet (C)dynamo (D)Electromagnet
D
An electrician should always consider the circuit to be "'hot" unless he definitely knows otherwise. The main reason is to avoid ?. (A)personal injury (B)having to find the panel (C)saving time (D)shutting off the wrong circuit
A
The Best thing to cut PVC conduit within a tight area is ?. (A)a short hacksaw (B)a nylon string (C)a knife (D)a pipe cutter
B
Ohm’s law is ?.
(A)an equation for determining power
(B)the relationship between voltage, current, and power
(C)the relationship between voltage, current, and resistance
(D)a measurement of wattage losses
C
FILLER (A)FILLER (B)FILLER (C)FILLER (D)FILLER
FILLER
What is the normal taper of a standard conduit thread-cutting die? (A)1/2" per foot (B)1/4" per foot (C)3/8" per foot (D)3/4" per foot
D
In an AC circuit the ratio of the power in watts to the total volt-amps is called the ?. (A)demand factor (B)power factor (C)turns-ratio (D)diversity factor
B
A continuous load is where the maximum current is expected to continue for ? hours or more. (A)five (B)two (C)three (D)four
C
FILLER (A)FILLER (B)FILLER (C)FILLER (D)FILLER
FILLER
A ladder which is painted is a safety hazard mainly because the paint ?.
(A)may conceal weak spots in the rails or rungs
(B)is slippery after drying
(C)causes the wood to crack more quickly
(D)peels and the sharp edges of the paint may but the hands
A
The chemical used as the agent in fire extinguishers to fight electrical fires is ?. (A)CO2 (B)K0H (C)H2O (D)L06
A
A location classified as ? my be temporarily subject to dampness and wetness. (A)dry (B)damp (C)moist (D)wet
A
The average dry cell battery gives an approximate voltage of ?. (A)1.5 (B)1.2 (C)1.7 (D)2.0
A
The ? circuit is that portion of a wiring system beyond the final overcurrent protection. (A)lighting (B)feeder (C)signal (D)branch
D
Which of the following will not affect the resistance of the circuit? (A)Length of the conductor (B)Diameter of the conductor (C)Insulation of the conductor (D)Temperature
C
The electromotive force required to cause a current to flow may be obtained ?. I. Thermally II. Mechanically III chemically (A)I only (B)I and III only (C)II and III only (D)I, II, and III
D
Which of the following is not True?
(A)A fluorescent fixture is more efficient than an incandescent fixture
(B)Room temperature has an affect on the operation of a fluorescent lamp
(C)Fluorescent fixtures have a good power factor with the current leading the voltage
(D)The life of a fluorescent bulb is affected by starting and stopping.
C
Resistance opposes the flow of the current in a circuit and is measured in ?. (A)farads (B)joules (C)ohms (D)henrys
C
Which of the following is true?
(A)wooden plugs may be used for mounting electrical equipment in concrete
(B)The high-leg conductor of a 4-wire delta is identified blue in color
(C)The minimum size service permitted by the Code for a residence is 100 amps
(D)The ungrounded conductor is connected to the screw shell of a lampholder
C
Multiple start buttons in a motor control circuit are connected in ?. (A)series (B)parallel (C)series-parallel (D)none if these
B
Which of the following is not true?
(A)Feeder demand factors are applicable to household electric ranges
(B)A green colored conductor can be used as an ungrounded circuit conductor
(C)insulated conductors #6 or smaller shall be white or gray, no marking tape permitted
(D)all joints or splices must be electrically and mechanically secure before soldering
B
Special permission is ?.
(A)granted by the electrical foreman on the job
(B)verbal permission by the inspector
(C)given only once on one blueprint change request
(D)the written consent of the authority having jurisdiction
D
One million volts can also be expressed as ?. (A)1 millivolt (B)1 kilovolt (C)1 megavolt (D)1 microvolt
C
Resistance in a circuit may be ?. I Resistance of the conductors II resistance due to imperfect contact (A)I only (B)II only (C)both I and II (D)Neither I nor II
C`
Which of the following is not true?
(A)All Receptacles on the 15 and 20 amp branch circuits must be of the grounding type
(B)Splices and joints shall be covered with an insulation equivalent to the conductor insulation
(C)The size of the conductor determines the rating of the circuit
(D)All 15 and 20 amps receptacles installed in a dwelling bathroom shall have GFCI protection
C
A magnetic field is created around a conductor ?.
(A)whenever current flows in the wire, provided the wire is made of magnetic material
(B)only when the wire carried a large current
(C)whenever current flows in the conductor
(D)only if the conductor is formed into a loop
C
A universal motor has brushes that ride on the ?. (A)commutator (B)stator (C)inter-pole (D)field
A
How many kw Hours are consumed by 25-60 watt light bulbs burning 5 hours in a 120V circuit. (A)1.5 (B)180 (C)7.5 (D)75
C
A dynamo is ?.
(A)a pole line insulator
(B)a tool used to test dielectric strength
(C)a meter used for checking the RPM of a motor
(D)a machine for converting mechanical energy into electrical energy
D
Which of the following is/are generally used for field magnets? I. Copper II. Steel III. Wrought iron (A)I and II only (B)I and III only (C)II and III only (D)I, II, and III
D
The difference between a neutral and a grounded circuit conductor is ?.
(A)only a neutral will have equal potential to the ungrounded conductor
(B)only a neutrals outer covering is white or natural gray
(C)only a neutral carries unbalanced current
(D)there is no difference
C
The normal rotation of an induction motor is ? facing the front of the motor. (The front of a motor is the end opposite the shaft) (A)Clockwise (B)Counterclockwise (C) (D)
B
A function of relay is to ?. (A)turn on another circuit (B)produce thermal electricity (C)limit the flow of electrons (D)create a resistance in the field
A
Which of the following is not true?
(A)It is an electrical impossibility to have a circuit with only inductive reactance because the metallic wire has a resistance
(B)The voltage of a circuit is the greatest effective difference of potential that exists between any two conductors of a circuit
(C)The current is said to lag the voltage in a circuit that has only capacitive reactance
(D)Power factor is the phase displacement of current and voltage in an AC circuit
C
Unity power factor, which means that the current is in phase with the voltage, would be ?. (A).50 (B).80 (C)0.10 (D)1.0
D
Rheostats and potentiometers are types of ? resistors. (A)Film (B)Variable (C)Fixed (D)wirewound
B
A laminated pole is ?. (A)one built up of layers or iron sheets, stamped from sheet metal and insulated (B)used in transmission lines over 100kv (C)a pole soaked in creosote (D)found in the western part of the USA
A
Which of the following is true?
(A)Conductors of different systems may not occupy the same enclosure
(B)Knife switched should be mounted in a horizontal position
(C)75 amps is a standard size fuse
(D)Circuits are grounded to limit excess voltage to ground, which might occur from lightning or exposure to other higher voltage sources
D
Electrical power is a measure of ?. (A)work wasted (B)Voltage (C)Rate at which work is performed (D)total work performed
C
What percentage of the maximum (peak) voltage is the effective (RMS) voltage? (A)100 (B)70.7 (C)53.7 (D)57.7
B
A low factor is commonly caused by ?. I. induction motors II. synchronous motors III. fluorescent lights (A)III only (B)II and III only (C)I and III only (D)I, II, and III
C
Which of the following is not true?
(A)Conduit painted with enamel cannot be used outdoors
(B)All AC phase wires, neutral and equipment grounding conductors if used, must be installed in the same raceway
(C)PVC shall have a minimum burial depth of 24”
(D)EMT raceway can be installed in an air conditioning-space heating duct
C
Which of the following is not true?
(A)Equal currents flow in the branches of parallel circuits
(B)The total resistance of a parallel circuit is less than the smallest resistor in the circuit
(C)the total current in a parallel circuit is the sum of the branch currents
(D)In a parallel circuit, there is more than one path for current flow
A
Hysteresis is ?.
(A)the tool used to read the specific gravity of a battery
(B)the lagging of magnetism,, in a magnetic metal, behind the magnetizing flux which produces it
(C)the opposite of impedance
(D)none of these
B
The electric pressure of a circuit would be the ?. (A)voltage (B)amperage (C)resistance (D)wattage
A
Permeability is ?. (A)the opposite of conductance (B)a measure of the ease with which magnetism passes through any substance (C)the total resistance to current flow (D)the liquid substance in a battery
B
The wheatstone bridge method is used for accurate measurements of ? (A)voltage (B)amperage (C)resistance (D)wattage
C
When a circuit breaker is in the OPEN position ?.
I. You have a short in the ungrounded conductor
II. You have a short in the grounded conductor
(A)I only
(B)II only
(C)either I and II
(D)Both I and II
C
In solving series-parallel circuits, generally you would ?. (A)treat it as a series circuit (B)reduce it to its simplest form (C)assume that all loads are equal (D)treat it as a parallel circuit
B
A commutator is ?. (A)a ditching machine (B)the inter-poles of a generator (C)a device for causing the alternating currents generated in the armature to flow in the same direction in the external circuit (D)a transformer with a common conductor
C
Which of the following is true?
(A)EMT may be threaded
(B)the “white” colored conductor connected to the silver colored post on a duplex receptacle on a 120V two-wire branch circuit is called the “neutral” conductor
(C)plastic water pipe is approved to be used for electrical conduit
(D)The screw shell of a lampholder may support a fixture weighing 6 pounds
D
To fasten a box to a terra cotta wall you should use of the following? (A)wooden plug (B)lag bolt (C)expansion bolt (D)toggle bolt
D
If a 240 volt heater is used on 120 volts, the amount of heat produced will be ?. (A)twice as great (B)four times as great (C)1/4 as much (D)the same
C
Which of the following about a strap wrench is/are true? I. You can turn pipe using one hand II. use in a tight corner III. use on different sizes of a pipe (A)I only (B)II only (C)III only (D)I, II and III
D
When soldering a joint, the flux is used to ?. (A)keep the wire cool (B)keep the surface clean (C)lubricate the joint (D)maintain a tight connection
B
The transferring of electrons from on material to another would be ? . (A)electrochemistry (B)static electricity (C)solar electricity (D)piezoelectricity
B
A minimum thickness of ? inch/inches of concrete over conduits and raceways should be used to prevent cracking. (A)1 (B)2 (C)3 (D)4
A
Wire connectors are generally classified as ? type(s). I. thermal II. pressure (A)I only (B)II only (C)both I and II (D)neither I not II
C
One of the disadvantages of indenter or crimp connectors is ?
(A)they must be re-crimped at each annual maintenance inspection
(B)that special tools are required to make the joint
(C)eventually they will loosen
(D)they can only be used for copper conductors
B
The usual service conditions under which a transformer should be able to carry its rated load are ?.
I. at rated secondary voltage or not in excess of 105% of the rated value
II. at rated frequency
III. temperature of the surrounding cooling air at no time exceeding 40C (104F) and average temperature of the surrounding cooling air during any 24-hour period not exceeding 30C (86F)
(A)I only
(B)II only
(C)III only
(D)I, II, and III
D
Which of the following is not true?
(A)An autotransformer may be used as part of the ballast for lighting circuits
(B)A branch circuit can never be supplied though an autotransformer
(C)the losses of the autotransformer are less than those of a two-coil transformer
(D)Autotransformers may be used as starting compensators for AC motors
B
Conductors supplying two or more motors shall have an ampacity equal to the sum of the full-load current rating of all the motors plus ? % of the highest rated motor in the group. (A)25 (B)80 (C)100 (D)125
A
FILLER (A)FILLER (B)FILLER (C)FILLER (D)FILLER
FILLER
FILLER (A)FILLER (B)FILLER (C)FILLER (D)FILLER
FILLER
The voltage of a circuit is best defined as ?.
(A)the potential between two conductors
(B)the greatest difference of potential between two conductors
(C)the effective difference of potential between two conductors
(D)the average RMS difference of potential between any two conductors
C