Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

C7 test > C7 test deck > Flashcards

C7 test deck Flashcards

1
Q

Power Factor is

A

The ratio of true power to apparent

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

WATTS equals

A

volts X amps

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

If watts =volts x amps, amps equal:

A

watts dvided volts

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

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

A

6 amps

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

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

A

40 ohms

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

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

A

12 volts

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

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

A

no it will draw 20 amps

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

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

A

1600 watts

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

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

A

Yes the circuit dwas 20.8 amps.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

One megahertz refers to how many cycles per second

A

one million

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

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

A

no it will draw 20 amps

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

The abbrevation MHZ stand for

A

megahertz

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

one gigahertz refers to how many cycles per second

A

one billion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

the abbrevation GHz stands for

A

gigahertz

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

what type of drill bit is most suitable for masonary

A

carbide

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

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

A

shift to a star drill

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

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

A

has less resitance that alumninum

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

what is the purpose of a maddrel

A

to clear or check conduit before pulling wire

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

compression connectors and lugs are attached to conductors

A

by crimmping with a special tool

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

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

A

step-down transformer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Conduit is specified by

A

nominal interior diameter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

Promary and secondary windings refer to

A

transformer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

what type of cable may be buried underground

A

Type UF

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

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

A

GFCI

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

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

A

do not have to be grounded

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

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

A

they require a constant contact on off switch

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

A thermostat should be mounted approximatel from the floor

A

5 feet

28
Q

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

A

install it near ductwork

29
Q

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

A

24”

30
Q

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

A

18”

31
Q

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

A

10 feet

32
Q

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

A

4- 1.2 ft

33
Q

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

A

12 inches

34
Q

while operating which tool is most important to wear gloves

A

cutters

35
Q

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

A

115%

36
Q

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

A

bushing

37
Q

the grounding conductor must be made of

A

copper, aluminumn, copper-clad aluminumn

38
Q

best to cut EMT tubung

A

pipe cutter

39
Q

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

A

24 teeth per inch

40
Q

Reaming a cut piect of EMT should take place

A

immediatly after cutting it

41
Q

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

A

125%

42
Q

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

A

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

43
Q

voltage reading with a test instrument are alwas taken

A

across the circuit

44
Q

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

A

Megger

45
Q

which device instument measures power

A

Wattmeter

46
Q

volmeters are connected

A

across the load of a closed circuit

47
Q

Ammeters are connected

A

in series in a closed circuit

48
Q

Ohmmeters are connected

A

across the load of an open circuit

49
Q

Wattmeters are connected

A

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

50
Q

to measure resistance

A

Ohnmeter

51
Q

to measure current

A

ammeter

52
Q

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:

A

the circuit wiring is defective

53
Q

the main symtoms of shock

A

pale skin, swaty skin, fast pulse

54
Q

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

A

6 feet

55
Q

step ladders may be no taller than

A

20 feet

56
Q

cleat laddes may be no taller than

A

30 feet

57
Q

extension ladder may be no taller than

A

44 feet

58
Q

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

A

10%

59
Q

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

A

48 hours

60
Q

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

A

call the local utility company and call th undegoun servie alert

61
Q

tailgate saftey meeting of supervisors with empoyees are required at l

A

least every 10 days

62
Q

a dosh permit is required for

A

constucitionof trnech over 5 ft demo scafolding

63
Q

MSDS

A

Materail safety data sheet

64
Q

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

A

an MSDS and training

65
Q

how should you treat a burn on a job site

A

lose bandages only

C7 test (4 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions