Electrical Systems (SART)
XHHW is an alphabetism or initialism which stands for.
"XLPE (cross-linked polyethylene)
For calculation purposes, what is the maximum wattage for each lighting outlet?
100 watts
What switch combination may be used to control a lamp or group of lamps in three different locations?
2-S3w and 1-S4w
Branch circuit conductors that supply loads other than cooking appliances shall have a capacity sufficient for the load served and shall not be smaller than what size?
2.0 sq. mm
As required in the prescribed standards in small appliance branch circuit, what is its required amperage rating?
20 amps
As general rule, what is the prescribed load (wattage) computation for general lighting and general-use receptacle?
24 volt-amperes
What is the minimum size of conductor for power outlet wiring in sq. millimeter?
3.5 mm2
In a branch circuit with 5.5mm2 conductor size, what is recommended amperage rating for branch circuit protection?
30 amps
For hospitals, what is its recommended lighting load demand factor for the first 50,000 volt-amperes or less?
40 percent
Is a hard-wearing power cable designed for the supply of mains electricity found in underground systems, power networks and cable ducting.
Armoured conductor
In electrical power distribution, Is a sheet metal duct containing either copper or aluminium busbars for the purpose of conducting a substantial current of electricity. It is an alternative means of conducting electricity to power cables or cable bus.
Busduct
A unit of assembly units or sections and associated fittings forming a rigid structural system used to support cables.
Cable tray
Is an electrical conductor composed of an inner aluminium core and outer copper cladding.The primary applications of this conductor revolve around weight reduction requirements. These applications include high-quality coils, such as the voice coils in headphones or portable loudspeakers; high frequency coaxial applications, such as RF antennas and cable television distribution cables; and power cables. CCA was also used in electrical wiring for buildings
Cladded conductor
A factory assembly of one or more conductors, each individual insulated and enclosed in a metallic sheath of interlocking metal tape, or a smooth corrugated metallic tube.
Metal clad cable (Type MC)
Who first worked on the induction priciples of electric generators and transformers?
Michael Faraday
A type of surface flush raceway designed to receive conductors and receptacles assembled in the field or in the factory.
Multi-outlet assembly
A factory assembly of two or more insulated conductors having an outer sheath of moisture-resistand, flame-retardant, non-metallic material.
Non-metallic sheated cable (Type NM and NMC)
In raceway wiring system, what does the abbreviation RSC stands for?
Raceway steel conductor
A type of raceway specially constructed for the purposes of pulling in or the withdrawing of wires or cables after the conduit is in place.
Rigid Metal Conduit (RMC)
A type of raceway specially constructed for the purpose of pulling in or the withdrawing of wires or cables after the conduit is in place.
Rigid metal conduit (RMC)
Are constructed of one, single piece of metal. It is tougher than a stranded conductor, but rigid and less flexible than a stranded conductor.
Solid conductors
Are conductors are made of multiple small strands, which group together to make up a single conductor
Stranded conductors
Similar to most of the cables and wires, used to specify the material type used for the outer-insulation and a few of the wires characteristics. Thermoplastic is a type of PVC material that is far thinner and emits a toxic smoke when burned
THHN
Is a designation for a specific insulation material, temperature rating, and condition of use (wet locations) for electrical wire and cable.
THHW
THHW stands for;
Thermoplastic Heat and Water-resistant Nylon-coated
THHN stands for;
Thermoplastic High Heat-Resistant Nylon.
A type of switch used for transferring one or more load conductor connections from one power source to another. Power outages can occur, even in high reliability distribution networks, leading to major incidents and losses on critical applications.
Transfer switch
A cable used underground since it is able withstand pressure and is resistant to other elements such as sunlight (black only), oil and gas and can be used as RHW-2 or RHH cable at temperatures up to 90°C in wet or dry locations.
USE
USE-2 cable stands;
Underground Service Entrance cable.
High Heat-resistant Water-resistant. Is a designation for a specific insulation material, temperature rating, and condition of use (suitable for wet locations) for electrical wire and cable. Used insulation instead of the PVC insulation used in THHN wire. It is more expensive option, but its coating is more resistant to chemicals, ozone and abrasions. Jacketed with cross-linked polyethylene.
XHHW
What type of wire or cable has the trade name moisture-resistant thermoset with an operating temperature ranging from 75' C to 90' C and can be used in dry, damp or wet locations? a. USE b. XHHW c. THHN d. THWN
XHHW
In electrical system design and installation, over-current may occur as a result from any of the following EXCEPT _______________. a. normal load condition b. ground fault c. over-load d. short circuit
a
What kind of device is intended for the protection of personnel that functions to de-energize a circuit or portion thereof within a established period of time? a. ground fault circuit interrupter b. circuit breaker c. isolation switch d. disconnecting means
a
Which of the following metallic materials is considered as the best conductor of electricity? a. copper b. aluminum c. iron d. gold
a
A word that is synonymous with alternating current generator.
alternator
Conductors are sized according to the amount of current it can carry under conditioms of use wihout exceeding its temperature rating. What is it?
ampacity
What do you call an insulating liquid usually used in transformer as insulation and coolant; it is a synthetic insulating liquid which when decomposed by electric arc will evolve non-flammable gaseous mixture.
askarel
For purposes of designating conveniently voltage class of a system, nominal voltage values are prescribed. Which of the following voltage value? a. 220 V/110 V b. 230 V/115 V c. 240 V/280 V d. 215 V/230 V
b
Location a term used in electrical installation, may refer to any of the following. Which of these term refers to location where installation is done underground or on concrete slabs or masonry in direct contact with earth and locations subject to saturation with water or other liquids? a. damp location b. wet location c. dry location d. none of these
b
The basic elements of an electric circuit are the following exceot ______________. a. source b. switch c. conducting path d. electrical load
b
What is the recommended amperage rating for a small appliance branch circuit rated at 1500 volt-amperes? a. 15 amperes b. 20 amperes c. 30 amperes d. 40 amperes
b
A device used with fluorescent and High Discharge (HID) lamps to provide the necessary starting voltage and to limit the current during operation of the lamp. What is it?
ballast
Hard drawn stranded copper conductors offers greater flexibility than a solid, hard-drawn wire. Principally used in energy transmission installations to maximise thermal and electrical conductivity, and to transmit energy with optimal efficiency.
bare conductor
In an electrical system layout, it is referred to as the circuit conductors between the final over-current protecting the circuit and the outlet(s). What is the term?
branch circuit
A type of raceway wiring system having a completely assembled metal troughing and fittings containing bare confuctors intended for use as feeders, the conductors being suitably supported an insulators.
busway
As used in the electrical code, conductors may be bare, covered or insulated. Which of the following refers to a conductor that is encased within a material of composition or thickness that is recommended as electrical insulation. a. insulated conductor b. bare conductor c. covered conductor d. any of these
c
Cables are conductors that are ______________. a. larger than wires b. stranded (no. 6 AWG and larger) c. both a and b d. none of these
c
Examples/s of conductors-on-insulator wiring is/are ____________. a. concealed knob-and-tube b. open wiring on insulators c. both a and b d. none of these
c
For voltage rated at 0-2000 volts, what is the required mininum size of copper conductors? a. 1.6 mm2 b. 2.0 mm2 c. both a and b d. 3.5 mm2
c
Fusible material in a fuse may be made of any of the following exept ______________. a. lead b. silver c. iron d. tin
c
Receptacles are rated at NOT LESS than how many volt-amperes for each single or for each multiple receptacle on one strap? a. 100 volt-amperes b. 120 volt-amperes c. 180 volt-amperes d. 220 volt-amperes
c
Tesla is the unit of _______________. a. magnetic flux b. magnetic induction c. both a and b d. none of these
c
The over-all covering of undergroud feeder and branch-circuit cables shall be _____________. a. fungus-resistant b. corrosion-resistant c. both a and b d. none of these
c
Which of the following is NOT a standard wattage of an incandescent lamp? a. 10 watts b. 25 watts c. 45 watts d. 50 watts
c
A unit or asembly units or sections and associated fittings forming a rigid structural system used to support cables.
cable tray
A continuous path of an electric current composed of conductors, conducting path and load?
circuit
A device in electrical system used as circuit protection designed to open or close a circuit by non-automatic means and to open the circuit automatically on a pre-determined over current without damage to itself when property applied within its prescribed rating.
circuit breaker
A reusable safety switch that breaks the circuit when the current becomes too high and opens a circuit automatically when the current exceeds a certain value.
circuit breaker
These are materials or substances that have free electrons or other charge carriers which permit charge flow when an emf (electromotive force) is applied across such material or substances.
conductors
Consist of a conductor insulated by a covering made of insulating material(s) as protection against accidental contacts with other covered conductors and with grounded parts such as tree branches etc.
covered conductor
A transformer is ____________. a. an ac device b. a dc device c. a mechanical deviced used to step up or step down voltage in arc. d. both a and c
d
Alternating current is characterizedvas having _________. a. postive and negative polarity b. average value is zero c. has frequency d. all of these
d
Copper as a conductor has the property/properties of being _____________. a. ductile b. malleable c. a only d. a and b
d
Electrically equipment are examined, identified and installed base on its ________________. a. mechanical b. electrical insulation c. heating effects d. all of these
d
Generator is a mechanical device used to convert mechanical energy to electrical energy. It can produce either alternating (ac) or direct curremt (dc). Which building utility system component utilizes? a. escalator b. emergency lighting c. elevator d. all of these.
d
It affects the resistance of a conductor. a. length b. area c. temperature d. all of these
d
Mho is defined as __________. a. the receprocal of ohm b. unit of conductance c. a only d. both a and b
d
What is/are the advantage/s of a circuit breaker over a fuse? a. it can act as switch b. its position can be easily detected (close/open) c. it can be used again after fault has been connected d. all of these
d
Which of the following is considered a special purpose outlet? a. air conditioning unit b. water pump c. water heater d. all of these
d
It is the ratio of the maximum demand of a system or part or a system to the total connected load of a system or part of a system under consideration; expressed in percentage.
demand factor
A type of switch consisting of a movable contact mounted on an arm that can be rotated and with several contacts arranged in circular matter. What is this kind of switch?
dial switch
On what principle do generators work?
electromagnetic induction
Unit of capacitance is ______________.
farad
A switch used in conjunction with two (2) three switches used to control lights in three different locations independently.
four-way switch
It is a simple type of over-current protective device consisting of a fusible link or wire of low melting temperature so that when subjected to excess current the energy loss in the link generates heat and melt it resulting in its self-destruction.
fuse
A device that senses imbalances in an electric current and protects outlets that may be used outdoors or near water surfaces.
ground fault circuit interrupter
The trade name for an insulated conductor with type letter THHN is ______________.
heat-resistant thermoplastic
The standard unit for frequency expressed in cycles per unit time.
hertz
Are used in electrical equipment to support and separate electrical conductors without allowing current through themselves. Material used in bulk to wrap electrical cables or other equipment
insulated conductor
A term which refers to an atom or molecule which is not electrically balanced.
ion
In electrical engineering, a switch is used to ensure that an electrical circuit is completely de-energized for service or maintenance
isolation switch
Typically, a square, circular, rectangular or octagonal metallic or non-metallic box or enclosure used in protecting wires and cables and where splices are made for branches. What is it?
junction box
An electrical instrument or device used to meadure power consumption in kilowatt-hours.
kilowatt-hour meter
A simple type of switching having hinged copper blades and a handle, contact between circuits can be made by swinging handle upwards and inserting into contact clips. This type of switch is used as disconnecting means. What do you call this type of switch?
knife switch
What do you call that part of an electric circuit other than the source which includes appliances such as television set, washing machine, electric range, etc.?
load
It characterizes short circuit.
low resistance, high current
It is also known as electric panel or load center.
panelboard
These are positively charged particles of an atom. What are those?
protons
A box with a blank cover that is installed in one or more runs of raceways to facilitate pulling-in of conductors.
pull box
These are channels including wiring accessories designed for holding wires, cables, or busbars. What is it?
raceway
This method of wiring involves the use of enclosed channels of metal or non-metallic materials designed expressly for holding wires, cables or busbars with additional functions. What is it?
raceway wiring
In an outlet, it is the contact device designed for the connection of a single attachment plug. What is it?
receptacle
What device should be used in converting alternating current into direct current? An example of this is that of an elevator where the power input is an ac and the required current to run thr motors is in dc.
rectifier
It is the physical property of conductors that opposes current and dissipates real power in the form of heat; it is measured in ohms.
resistance
The term impedance is used in transformers and other devices in ac system is a combination of ___________.
resistance and reactance
A circuit type where components are electrically connected end-to-end.
series circuit
Conductors used for general wiring and installed in raceways of sizes 8.0 mm2 and larger shall be ____________________. a. cladded b. solid c. stranded d. armored
stranded
A switch used in conjunction with two (2) three switches used to control lights in two different locations independently.
three-way switch
A type of switch used for transfering one or more load conductor connections from one power source to another. Is an electrical switch that switches a load between two sources. Some of this switch either manual or automatic, in that an operator effects the transfer by throwing a switch, while others are automatic and trigger when they sense one of the sources has lost or gained power.
transfer switch
It is analogous to pressurr in water flow.
voltage
