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Low Voltage > Test 2 > Flashcards

Test 2 Flashcards

1
Q

To break a stuck nut loose you should use a

A

Box wrench

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2
Q

Hammer drills are used for drilling holes in

A

Masonry and concrete

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3
Q

What type of tool is used to trace a lost or mislabeled cable

A

Toner and amplifier probe

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4
Q

What do you coat steal fasteners with to prevent corrosion

A

Zinc

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5
Q

Article 800 in the NEC coveres

A

Communication circuits

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6
Q

A balanced signal is transmitted on what type of cable

A

Twisted pair

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7
Q

An unbalanced signal is transmitted on what type of cable

A

Coaxial

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8
Q

A twisted pair has a maximum run distance of

A

90 meters

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9
Q

The maximum pull force for unshielded twisted pair cable shall not exceed

A

25 lbs

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10
Q

To improve conductor flexibility and durability use a

A

Stranded conductor

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11
Q

How do you start a cut in box

A

Horizontal in case you hit a stud

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12
Q

What type of cable goes floor to floor

A

Riser

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13
Q

Where can you use riser cable

A

Vertical and horizontal in non plenum spaces

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14
Q

Where can you use plenum cable

A

Anywhere

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15
Q

Where can you use general purpose cable

A

Only horizontal

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16
Q

Can class 2 and 3 cables be used with class one cables

A

Yes when they are separated by a barrier

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17
Q

General purpose cable must be ________ and classified for specific use and purpose

A

Listed

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18
Q

General purpose cable must be listed and ________ for specific use and purpose

A

Classified

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19
Q

The three parts of a coaxial cable

A

Braid
Conductor
Dielectric

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20
Q

Three types of communication cable are

A

Twisted
Fiber
Coaxial

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21
Q

What is abandoned communication cable

A

Cable that is not terminated at the device or identified for future use with a tag

22
Q

The front edge of a box shall be no more than ________ from the finished surface of a Sheetrock wall.

A

6mm

1/4 in

23
Q

The three parts of a screwdriver are

A

Shank
Handle
Blade

24
Q

What is a plenum space

A

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

Environmental air

25
Q

What is a riser space

A

A vertical shaft where wire runs from floor to floor

26
Q

How will modifying a UL listed box affect its listing

A

Negates the UL listing

27
Q

A balun is a device designed to

A

Change a signal from balanced to unbalanced

28
Q

Define AFF

A

Above finished floor

29
Q

Why is it important to measure on center and AFF

A

More accurate and uniform

30
Q

Which article covers fire alarm code

A

760

31
Q

Article 760 covers?

A

Fire alarm code

32
Q

What article covers communication circuits

A

800

33
Q

Define green concrete

A

Concrete under 28 days old

34
Q

What must you do to mount an anchor on concrete less than 7 days old

A

Have a site test from the manufacture

35
Q

What is abandoned cable

A

Not terminated or listed for future use

36
Q

What type of device must be installed on a fire rated wall

A

A fire rated device

37
Q

Electrical/non electrical box must have what warning

A

Power limited side must state “ for low voltage use only”

38
Q

What is a bushing for

A

Protect wires from abrasions

39
Q

What is bend radius

A

Specific degree of bend to prevent breakage

40
Q

UTP

A

Unshielded twisted pair

41
Q

Bend radio us for UTP

A

4 times outer diameter

42
Q

Bend radius for multi pair

A

Not smaller than 10 times

43
Q

Bend radius intra building

A

2 inches minimum

44
Q

What is a cross over cable used for

A

Testing

Flexible durable and can connect devices

45
Q

Fiber optic bend radius

A

15x

46
Q

What is pull force for fiber optic cable

A

50 pounds

47
Q

What is BiCi standard for

A

Communication wire

2 90 degree bends per 100 feet of cable

48
Q

Max run distance for coaxial

A

185 m

49
Q

Max run distance for fiber

A

2km

50
Q

Max run distance for coaxial

A

185 m

51
Q

Max run distance for fiber

A

2km

Low Voltage (9 decks)

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