MES Test 3

Color ____ is a technique used to identify switch terminal screws through various colors.

coding

A _____ label is a stamped or printed icon that indicates that a device or material has been approved for consumer use by Underwriters Laboratories Inc.

UL

A _______ is a short groove that indicates the amount of insulation that must be removed from a wire so the wire can be properly inserted into a switch.

strip gauge

A _____ is a contact device installed for the connection of plugs and flexible cords to a supply current to portable electrical equipment.

receptacle

_____ receptacles include a long neutral slot, a short hot slot, and a U-Shaped ground hole.

Standard

A ______ is a fast-acting receptacle that detects low levels of leakage current to ground and opens the circuit in response to the leakage (ground fault).

ground fault circuit interrupter

The terminals of a ______ switch are identified as common, traveler A, and traveler B.

3-way

______ are often called convenience outlets.

receptacles

Steel, bronze, and green colors are typically used on receptacle ______.

terminal screws

A ______ receptacle is used to minimize problems in sensitive applications or areas of high electrical noise.

isolated bronze

A _________ is any current above the level that is required for a dangerous shock.

ground fault

A _____ indicates the minimum safety requirements and is not meant to serve as a quality comparison between manufacturers.

UL label

_______ is a type of cable that consists of three insulated electrical conductors held together and protected by a strong plastic jacket.

nonmetallic sheathed cable

The 14 in a cable marked 14/2 indicates ______.

the size of the wire

Receptacle boxes are _____ shaped.

square, octagonal, and rectangular

A _____ is a round identification punched into the metal of a box and by unpunched narrow strips of metal.

knockout

Boxes are typically secured by...

nails

When securing cables to a box, at least ___'' of wire must extend beyond the bottom of the box to allow enough wire for making connections to receptacles and switches.

8

When notches are used to run cable through stud walls, the cable run must be protected from nails by a steel plate at least ___'' thick.

1/16

NM and NMC cable must be supported or secured every ___'of cable run and within 12'' of a box.

4 1/2

A ____ lamp is an electric lamp that produces light by the flow of current through a tungsten filament inside a gas-filled, sealed glass bulb.

incandescent

A ____ lamp is a low-pressure discharge lamp in which ionization of mercury vapor transforms ultraviolet energy generated by the discharge of light.

florescent

A ____ lamp is an HID lamp that operates at a low vapor pressure and uses sodium as the vapor.

salt

A ____ lamp is an HID lamp that produces light by electrical discharge through mercury vapor.

mercury-vapor

A ____ ballast is a ballast that connects a coil in series with the power line leading to the lamp.

reactor

A _____ is an assemblage of equipment installed for switching, changing, or regulating the voltage of electricity.

substation

____ are covered with an insulating material that is available in different colors.

conductors

As the length of the conductor [increases/decreases], its resistance increases.

increases

____ is the resistance of a conductor having a specific length and cross-sectional area.

resistivi

As the ____ of a conductor increases, the free electrons between he atoms move faster and their vibrations increase.

temperature

Large wire sizes allow more ___ to flow, which produces a stronger magnetic field.

current

____ are generally added to a circuit to control the amount of current flowing in a circuit or branch of the circuit.

inductors

A ____ is an electric device specifically designed to store a charge of energy.

capacitor

A ____ is any device that converts electrical energy into motion, heat, light or sound.

load

The ___ rating of a transformer indicates the amount of power the transformer can safely deliver.

power

When sizing a transformer, the primary side of the transformer must have a rating equal to the supply ____.

voltage

Temperature ____ in a transformer is the temperature of the windings above the existing ambient temperature.

rise

A ____ configuration is a transformer connection that has one end of each transformer coil connected together.

wye

A ______ configuration is a transformer connection that has each transformer coil connected end-to-end to form a closed loop.

delta

____ is a light-gauge electrical pipe often referred to as thin-wall conduit.

electrical magnetic tubing

_____ cable is very popular in residential wiring because it is inexpensive and easy to install.

nonmetallic sheathed cable

Type ____ cable is a nonmetallic-sheathed cable that has the conductors enclosed within a nonmetallic jacket and is the type typically used for dry interior wiring.

NM

_____ is the placement of electrical boxes and wires before wall coverings and ceilings are installed.

rough-in

A service panel should be located close to the ____ to avoid costly runs to major appliances.

kitchen

___ temperature is the average temperature of the air that cools a transformer over a 24-hour period.

standard ambient

____ is a force that acts at a distance and is caused by a magnetic field.

magnetism

____ is the magnetic field produced when electricity passes through a conductor.

electromagnetism

The more coil turns a solenoid has, the ___ the linear force.

greater

A ____ is an electrical device that uses electromagnetism to change voltage from one level to another or to isolate one voltage to another.

transformer

____ inductance is the effect of one coil inducing a voltage into another coil.

mutual

The ____ coil (input side) of the transformer is the coil to which the voltage is connected.

primary

A ___ transformer is a transformer in which the secondary coil has fewer turns of wire than the primary coil.

step-up

____ loss is caused by the resistance of copper wire to the flow of current.

copper

____ transformers are step-down transformers that are used to lower the voltage to the control circuit in which the control switches, contactors, and motor starters are connected.

instrumental

A _____ box is an electrical device designed to house electrical components and protect wiring connections.

receptacle

____ grounding is a grounding method where the ground wire is attached directly to an electrical component such as a receptacle.

component

_____ grounding is a grounding method where two ground wires are used to connect an electrical device to a ground screw in the box then to system ground.

pigtail

Metallic-sheathed cable or ____ cable provides additional protection to wires by using a metal outer jacket.

armored

_____ is a rugged protective tube through which insulated conductors are pulled.

conduit

_____ is the term used for the process of pulling wires through conduit.

fishing

A service entrance for a single family dwellings require a minimum _____ a capability.

100

A ____ service entrance has all service wires running from a utility pole to a service head, where the meter socket and riser are firmly secured to the exterior of a dwelling, where the service panel is placed inside.

overhead riser

A ___ service entrance has all service wires buried underground.

lateral conduit

In typical residential service, ___V is obtained between the red and black service wires.

230

Any single circuit breaker can only furnish power to one ___V circuit.

115

A service ____ consists of overhead wires and devices that connect the company power lines to a residence.

drop

The minimum clearance for service drop conductors passing over an alley or street is ____'.

18

A service ____ is any service to a residence that is achieved by burying the wires underground.

lateral

A generator is an electromechanical device that converts mechanical energy into ____ energy by means of electromagnetic induction.

electrical

Typical home emergency standby generators range in capacity from 6500 W to ___W.

40,000

Generators are chosen based on capacity in ____.

watts

Rated voltage is a voltage range that is +-___% of ideal voltage.

10

A ___ power interruption is a decrease to 0 V on one or more power lines lasting between 3 sec and 1 min.

temporary

Service entrances provide all of the equipment necessary to obtain ___ and distribute it throughout a residence.

electricity

A service ___ has service wires run from a utility pole to a service head on or above the residence.

drop

A service ___ has electrical service wires to a residential buried in the ground.

lateral

Residential services has a standard voltage of ___V.

115/230

The white wire is the ____ in the service panel.

neutral

Inside the service panel, where the wires are terminated, metal conductors called ___ bars continue the system.

bus

Fastening the handles of circuit breakers together ensures that, in the event of a ___V overload, both hot lines are disconnected simultaneously.

230

The service drop is owned and maintained by the...

power company

When a ____ rise of used, the service installation is shared by the homeowner and the utility company.

pole

When a service entrance originates from a transformer pad, special ___ cable is used to make an insulation.

direct burial

___ or finishing the service requires the installation of internal service conductors, circuit breakers, and branch circuit wiring.

trimming out

___ generators are installed during new construction or retrofitted into existing residences and businesses.

stand by

A ____ switch is an electrical device that transfers the load of residence from public utility circuits to the output of a standby generator during a power failure.

automatic

____ transition switching is a process in which power is momentarily disconnected when switching a circuit from one voltage supply or level to another.

open circuit

A ___ is a positively-charged particle that also exists in the nucleus of the atom.

electron

A ____ is the outermost shell of an atom and contains the electrons that form new compounds.

valence shell

A ____ is an electric device that uses electromagnetism to change AC voltage from one level to another.

transformer

__ is a clothing and/or equipment worn by individuals to reduce the possibility of injury in the work area.

personal protective equipment

The five common types of ____ are A, B, C, D, and K.

fires

Class ___ fires occur in facilities near or in electrical equipment.

D

_____ is electrical charge at rest.

static electricity

A ____ is an overcurrent protection device with a mechanical mechanism that may manually open a circuit when an overload condition or short circuit occurs.

circuit breaker

A ____ is a fast-acting receptacle that detects low levels of leakage current to ground and opens the circuit in response.

ground fault circuit interrupter

Class _ fires are controlled with water.

A

The major sources of energy are...

gas, wood, nuclear power

____ current flows in only one direction.

Direct

A ____ is a material that has a very high resistance and resists the flow of electrons.

insulator

____ is the effect that occurs when light falls on a surface.

reflection

____ energy is stored energy a body has due to its position, chemical state, or condition.

potential

_____ energy is the energy of motion.

kinetic

____ is the amount of electrical pressure in a circuit.

voltage

____ voltage is voltage that reverses its direction of flow at regular intervals.

AC

____ is the amount of electrons flowing through an electrical unit.

current

____ is the rate of doing work or using energy.

power

A ____ circuit is a circuit that contains only resistive components, such as heating elements and incandescent lamps.

resistive

A _____ is the unit used to measure the total amount of light produced by a light source.

lumen

A ____ is a test instrument that indicates the presence of voltage when the test touches, or is near, an energized hot conductor or energized metal part.

voltage indicator

When a receptacle is properly wired, a test _____ will illuminate when the test light leads are connected between the neutral slot and the hot slot.

light bulb

A ____ is an electrical test instrument that can measure two or more electrical properties and display the measured properties as numerical values.

digital multimeter

A ____ is a graphic element that represents a quantity or unit.

symbol

A ____ display is an electronic device that displays readings as numerical values.

digital

A ____ voltage is a voltage that appears on a meter that is not connected to a circuit.

ghost

A ____ ammeter is a meter that measures a current in a circuit by measuring the strength of the magnetic field around a conductor.

clamp on

Clamp-on ammeters are normally used to measure ____ ______ from 0.01 A or less to 1000 A or more.

AC currents

A ______ is a device that is used to measure the amount of resistance in a component that is not powered.

ohmmeter

A ____ is a device that detects insulation deterioration by measuring high resistance values under high test voltage conditions.

megometer

A ____ is a meter capable of measuring and displaying two or more quantities.

multimeter

A ____ is used to measure the amount of current flowing in a circuit that is powered.

ammeter

The total _____ in a circuit containing series-connected loads equals the sum of the resistances of all loads.

resistance

The voltage applied across loads connected in _____ divided across all loads.

series

Conductors should be sized large enough to prevent no more than 3% ____ from the power source to the load.

voltage drop

_____ is produced when voltage is applied to a load and current flows through the load.

power

A ____ has two or more components connected so that there is more than one path for current flow.

parallel connection

The power formula is useful when determining expected _____ values because most electrical equipment lists a voltage and power rating.

current

Ohm's law states that _____ in a circuit is equal to voltage divided by resistance.

current

The _____ is the relationship between power, voltage, and current in an electrical circuit.

power formula

The power formula states that current in a circuit is equal to power ____ voltage.

divided by

_____ switches are often connected in series with automatic switches.

manually-operated

A ____ is a drawing the indicates the connections of all devices and components in a residential electrical system.

electrical layout

A ____ controlled circuit is any circuit that requires a person to initiate an action for the circuit to operate.

manually

____ are designed to hold several electrical wires firmly together to provide an insulating cover for the connection.

wire nuts

____ is the joining of two or more electrical conductors by mechanically twisting the conductors together or by using a special splicing device.

splicing

_____ is required to protect slices from oxidation and to insulate individuals against electrical shock.

taping

____ is the process of joining metals by using filler metal and heat to make a strong electrical and mechanical connection.

soldering

A_____ is an assembly of conductors electrical devices, and components through which current flows.

electrical circuit

A ______ is a drawing that indicates the placement of all electrical devices and components and the wiring required to connect all the equipment into circuits.

wiring diagram

_____ solder must NEVER BE USED ON ELECTRICAL CONNECTIONS because it corrodes electrical connections.

acid core