C7 test deck Flashcards by craig heiman

Power Factor is

The ratio of true power to apparent

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WATTS equals

volts X amps

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If watts =volts x amps, amps equal:

watts dvided volts

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a device with a resitance of 20 ohms is connected to a 120 v circuit. acording to Ohm’s law, how many amps will it draw

6 amps

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a device draws 3 amps at 120 v. according to Ohm’s law, what is its resistance

40 ohms

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a applicance has a resistance of 24 ohms and draws 0.5 amp. According to ohm’s law, what voltage should be supplied

12 volts

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a device consumes 2400 watts of power at 120 volts. accodring to Wastts law, will at 15 amp circuit be sufficent for the device.

no it will draw 20 amps

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a customer has a living room circuit with the following devices: one 60 wat device, five 100 watt devices, and a six 90 watt devices. The customer daughter wants to add a 500 watt stero system rated at 800 watts output- to the circuit. What is the total watt potentially conusmed if the stero is added

1600 watts

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an electrician is checking a 12-volt circuit that appears to be overloaded. A meter cannot be placed on the circuit directly, so the total load must be calculated. The circuit has an overcurrent device set 15 amps. the circuit had a total of five 50-watt devices. Is the Circuit overloaded

Yes the circuit dwas 20.8 amps.

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One megahertz refers to how many cycles per second

one million

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a device consumes 2400 watts of power at 120 volts. According to Watts law, will a 15 amp circuit be sufficient for the devices

no it will draw 20 amps

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The abbrevation MHZ stand for

megahertz

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one gigahertz refers to how many cycles per second

one billion

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the abbrevation GHz stands for

gigahertz

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what type of drill bit is most suitable for masonary

carbide

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you are drilling into cocrete with a carbide bit. After a while , dust stops coming out of the hole even though you are apllying pressure with a sharp bit. You conclude that you have probalby run into into piece of rock. You should

shift to a star drill

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the main reason copper is prefteeed to aluminum for wiring is that copper

has less resitance that alumninum

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what is the purpose of a maddrel

to clear or check conduit before pulling wire

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compression connectors and lugs are attached to conductors

by crimmping with a special tool

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what is used to reduce voltage from 120 V to 24 V

step-down transformer

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Conduit is specified by

nominal interior diameter

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Promary and secondary windings refer to

transformer

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what type of cable may be buried underground

Type UF

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Which of the following is designed to protect the user from shock

GFCI

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Power tools and electrical equipment must be grounded. Double- insultate power tools

do not have to be grounded

what do the follwong tools have in common: drills, tappers, fasteer drivers, grinders, disc amd belt sanders, saber saws, circular saws and chain saws

they require a constant contact on off switch

A thermostat should be mounted approximatel from the floor

5 feet

which of the follwoing statmets is not correct concering the installation of a thermasat

install it near ductwork

according to the NEC, the min cover for the direct buried cables or conductors is

24"

according to the NEC the min cover for the rigid nonmetalic conduit is

18"

according to the NEC the max distance between supports in straight runs of EMT (electical metalic tubing) is:

10 feet

according to the NEC nonmetallic sheathed cable ( type NM or NMC must be secured at intervals no greater than

4- 1.2 ft

according to the NEC, nonmetallic sheather cable (type NM or NMC) must be secured within blank of evey cabinet, box or fitting

12 inches

while operating which tool is most important to wear gloves

cutters

according to the NEC, the ampacity form generator terminals to the first overcurrent device must be at least blank of the nameplate current rating of the generator

115%

in a generator where wires pass thougha n opening in an enclosure, conduit box, or barrier, use a blank to protect the conductor for sharp edges

bushing

the grounding conductor must be made of

copper, aluminumn, copper-clad aluminumn

best to cut EMT tubung

pipe cutter

hackswas to cut EMT, it should have a blad nor carser than

24 teeth per inch

Reaming a cut piect of EMT should take place

immediatly after cutting it

transformers rated at 600 volts must be protected by an overcurrent device on the primary side rated or set at no more than______rated primary current of the transformer

125%

single pole siwth with a test ligh. First you put the swithch in the off postion. Than , with one probe on the ground, you altenately place the other probe on each of the two terminals. It lighs both times an you coconclude the switch is working. you proceeeded

incorrectly. The swithc should hav been in the ON postion for testing.

voltage reading with a test instrument are alwas taken

across the circuit

the insrument used to test resitance, in megohms, to the flow of current thoiugh and/or over the surface of insulation opf electical equipmentis called

Megger

which device instument measures power

Wattmeter

volmeters are connected

across the load of a closed circuit

Ammeters are connected

in series in a closed circuit

Ohmmeters are connected

across the load of an open circuit

Wattmeters are connected

accoss the load in a closed circuit an in series in a closed circuit

to measure resistance

Ohnmeter

to measure current

ammeter

when measuing low voltage circuit in a system the is not working propperly. You insert the probes of a test light into the two slots of a 120 V recepticle and the test light comes on. You would conclude that:

the circuit wiring is defective

the main symtoms of shock

pale skin, swaty skin, fast pulse

the ground within______of buildings under construction must be kept free from irregularities what it is practicable

6 feet

step ladders may be no taller than

20 feet

cleat laddes may be no taller than

30 feet

extension ladder may be no taller than

44 feet

section of extenion ladders must ovelap by at lead blank of the working lenght

10%

before you a dig a tench or excavation, detemin the location of undergorund utilites an notify the owner at least blank in adance

48 hours

when digging a trench the best way to ge info on undergorun utilites is to

call the local utility company and call th undegoun servie alert

tailgate saftey meeting of supervisors with empoyees are required at l

least every 10 days

a dosh permit is required for

constucitionof trnech over 5 ft demo scafolding

MSDS

Materail safety data sheet

an employer whose empolyees use a substance listed in the list of hazardous substances must provide

an MSDS and training

how should you treat a burn on a job site

lose bandages only