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Low Voltage > DC Final > Flashcards

DC Final Flashcards

1
Q

To break a stuck nut loose you should use a ______ wrench

A

Box

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2
Q

Rubber grips on hand tools are for

A

Increased grip and comfort of the tool

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3
Q

In order to protect fasteners from corrosion they should be coated in?

A

Zinc

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4
Q

A balanced signal is transmitted on what kind of cable?

A

Twisted pair

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5
Q

Unbalanced signal is transmitted in what type of cable

A

Coaxial

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6
Q

Twisted pair cable has a max run distance of

A

90 m

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7
Q

Max pull force for a UTP

A

25 lbs

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8
Q

To improve conductor durability and flexibility use a _________ conductor

A

Stranded

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9
Q

Non metallic flexible raceway must be _______ and ________ for specific use and purpose

A

Listed and classified

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10
Q

In a series circuit _______ is the same at every point in the circuit

A

Current

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11
Q

What is the unit of measure for power

A

Watt

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12
Q

When 2 resistors are connected in series overall resistance is said to

A

Increase

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13
Q

When two resistors are connected in parallel the overall resistance is said to

A

Decrease

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14
Q

A joule is _______ than a kWh

A

Smaller

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15
Q

In a circuit with fixed resistance if you double voltage what will happen to amperage

A

It will double

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16
Q

What is the correct height to distance from wall ratio for using an extension ladder

A

4-1

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17
Q

Time required to complete one cycle of AC current is called the

A

Period

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18
Q

What are 3 states of energy

A

Potential
Kinetic
Rest

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19
Q

The 3 types of communication cable are

A

Coax
Twisted pair
Fiber

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20
Q

90 degree bends per 100 ft segment of conduit

A

2

21
Q

What is a potentiometer

A

3 tiered variable voltage resistor

22
Q

What is the wattage rating of a resistor mean

A

Max wattage it can sustained for an extended period of time

23
Q

The sum of power consumed at each component in a series circuit is equal to

A

Total power

24
Q

Kirchhoffs current law

A

Current into a source equals current out

25
Q

Kirchhoffs voltage law

A

Sum of all voltage drops equals voltage source

26
Q

How far should a ladder top extend above the roofs edge for a building when used as access to the roof of a building

A

3ft

27
Q

Extension ladders should have a minimum of ______ overlap between sections when extending

A

3ft

28
Q

What are th most common size knockouts in a 1900 box

A

1/2 and 3/4 inch

29
Q

A recessed box shall be installed so that the front edge of the box is not more than how far from the edge of the Sheetrock

A

1/4 in

30
Q

Electrons have a ____ charge

A

Negative

31
Q

What is the relationship between Columbus and ampers

A

1 amp equals 1 column per second

32
Q

When pulling communication cable you should pull no more than ________ per segment

A

100ft

33
Q

Plenum space

A

A compartment or chamber to which one ore more air ducts are connected to form the air distribution system

Environmental air

34
Q

Riser space

A

A vertical shaft going between floors

35
Q

How will modifying a ul listed box affect its listing

A

Negates UL listing

36
Q

What is the purpose of a bushing

A

Protect wire from abrasion

37
Q

Define AFF

A

Above finished floor

38
Q

Why is it important to measure on center and AFF

A

More accurate and uniform

39
Q

Define green concrete

A

Concrete younger than 28 days

40
Q

What are 3 advantages to fiber has over copper conductors

A

Travel distance
Security
Speed

41
Q

What is abandoned cable

A

Cables that are not terminated to a device or labeled for future use

42
Q

What is the difference between series and parallel circuits

A

Parallel circuit has 2 or more oaths for current while series only has one

43
Q

What happens to batteries connected in series vs parallel

A

In series source voltage equals sum of voltages

In parallel voltage stays the same

44
Q

FPLP

A

Fire power limited plenum

45
Q

CL2P

A

Class 2 plenum

46
Q

CL3

A

Class 3 general purpose

47
Q

CMR

A

Communications riser

48
Q

Electrons flow from

A

Negative to positive

49
Q

A cross over cable is used between permanently installed equipment and user devices? T/F

A

False

Low Voltage (9 decks)

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