Nevada C-42 Constructing, Altering or Improving Video Service Networks Contractor Examination

Under NAC 624.574, what work may a Nevada C-42 contractor perform?

• AConstruct, alter, or improve video service networks
• BInstall only interior telephone station wiring
• CBuild any electrical service of 600 volts or less
• DInstall fire-alarm initiating and notification circuits

Which 2017 NEC article covers community antenna television and radio distribution systems that use coaxial cable?

• AArticle 725
• BArticle 800
• CArticle 810
• DArticle 820

Which 2017 NEC article covers communications circuits such as telephone and similar premises communications wiring?

• AArticle 640
• BArticle 770
• CArticle 800
• DArticle 820

Which 2017 NEC article covers network-powered broadband communications systems that deliver voice, video, or data through a network interface unit powered from the network?

• AArticle 725
• BArticle 800
• CArticle 830
• DArticle 840

A fiber drop ends at an optical network terminal that is powered from a premises outlet rather than from the outside plant. Which 2017 NEC article applies?

• AArticle 690
• BArticle 800 only
• CArticle 830
• DArticle 840

Which 2017 NEC article covers optical fiber cables and optical fiber raceways used on a video service network?

• AArticle 725
• BArticle 760
• CArticle 770
• DArticle 820

Under NEC 2017 90.3, how do Chapter 8 communications articles relate to Chapters 1 through 7?

• AChapter 8 always amends Chapters 1 through 7 the same way Chapter 3 does
• BChapter 8 is independent of Chapters 1 through 7 except where a Chapter 8 rule specifical…
• CChapters 1 through 7 never apply to any communications installation
• DChapter 8 applies only to utilities and is outside the NEC for contractors

NEC 2017 820.15 permits coaxial cable to deliver power to equipment directly associated with the radio-frequency distribution system only if the voltage is not over:

• A30 volts
• B50 volts
• C60 volts
• D120 volts

What must be done with the accessible portion of abandoned coaxial cable under NEC 2017 820.25?

• AIt may remain if it is still in good condition
• BIt shall be removed unless it is identified for future use with a tag
• CIt shall be cut flush and left in the wall cavity
• DIt shall be painted red and left in place as a spare

When coaxial cable penetrates a fire-resistance-rated wall, floor, or ceiling, NEC 2017 820.26 requires the opening to be:

• ALeft open for cable movement
• BPacked only with fiberglass batt insulation
• CFirestopped using an approved method so the fire-resistance rating is maintained
• DCovered with duct tape on both sides

Unlisted outside-plant coaxial cable may enter a building under NEC 2017 820.48 only if, among other conditions, the length inside the building measured from the point of entrance does not exceed:

• A10 ft (3.0 m)
• B25 ft (7.5 m)
• C50 ft (15 m)
• D100 ft (30 m)

The bonding conductor or grounding electrode conductor for a CATV coaxial shield under NEC 2017 820.100 shall not be smaller than:

• A18 AWG copper
• B16 AWG copper
• C14 AWG copper or other corrosion-resistant conductive material
• D8 AWG copper only

In a one- or two-family dwelling, the CATV bonding conductor or grounding electrode conductor under NEC 2017 820.100(A)(4) shall be as short as practicable and shall not exceed:

• A6 ft (1.8 m)
• B10 ft (3.0 m)
• C20 ft (6.0 m)
• D30 ft (9.0 m)

A one-family dwelling CATV ground block cannot be bonded to the power grounding electrode system with a conductor 20 ft or shorter. A separate communications ground rod is driven. Which installation matches NEC 2017 820.100?

• AAn 8 ft × 5/8 in. power ground rod used alone, with no bond to the service grounding elec…
• BA communications ground rod not less than 5 ft long and 1/2 in. in diameter, bonded to th…
• CA 4 ft pipe electrode with no bond to the service
• DA connection only to a gas-pipe electrode

Unlisted outside-plant coaxial must run 80 ft from the exterior wall to the ground block. Which method makes the installation comply with the NEC 2017 820.48 50 ft rule?

• ALeave the unlisted cable exposed on basement joists for the full 80 ft
• BPlace the unlisted cable in Schedule 40 PVC so the entire 80 ft is considered outside
• CInstall the unlisted cable in rigid metal conduit or intermediate metal conduit that is b…
• DPaint the jacket plenum-white and treat the cable as Type CATVP

Where coaxial cable is run in free air beside electric light or power conductors, NEC 2017 820.133 generally requires a separation of at least:

• A1/4 in. (6 mm)
• B1 in. (25 mm)
• C2 in. (50 mm)
• D12 in. (300 mm)

NEC 2017 820.133(B) generally prohibits using which method as the means of support for coaxial cable?

• AListed straps or staples on a framing member
• BJ-hooks attached to the building structure
• CStrapping, taping, or otherwise attaching the coaxial cable to the exterior of a conduit…
• DA messenger in an aerial span

Which listed coaxial cable type is required for exposed installation in other spaces used for environmental air (a ceiling plenum) under NEC 2017 Article 820?

• AType CATVX
• BType CATV
• CType CATVR
• DType CATVP

Under the NEC 2017 Article 820 substitution hierarchy, which listed cable may replace Type CATVR in a riser?

• AType CATV
• BType CATVX
• CType CATVP
• DUnlisted flooded outside-plant coaxial

NEC 2017 820.24 sends coaxial installations through framing members to 300.4(D). Cables run parallel to framing shall be kept at least which distance from the nearest edge, unless a steel plate is used?

• A3/4 in. (19 mm)
• B1 in. (25 mm)
• C1-1/4 in. (32 mm)
• D2 in. (50 mm)

NEC 2017 250.94 requires an intersystem bonding termination (or the permitted busbar alternative) to have capacity for at least how many communications-system bonding conductors?

• AOne
• BTwo
• CThree
• DSix

Where coaxial cable enters a building from the outside plant, NEC 2017 820.93 requires the outer conductive shield to be grounded:

• AAt the farthest subscriber outlet
• BOnly at the headend, never at the building
• CAs close as practicable to the point of entrance
• DOnly if the run is longer than 100 ft

Direct-buried coaxial cable sharing a trench with electric light or power conductors must, under NEC 2017 820.47, be separated by at least 12 in. unless:

• AThe coaxial cable is Type CATVX
• BEither the power conductors or the coaxial cables are in a raceway, or the power conducto…
• CThe voltage is 480 volts or less
• DThe trench is in a public right-of-way

NEC 2017 820.44 generally requires overhead coaxial that passes above a roof to have a vertical clearance of not less than 8 ft. Which reduction is the recognized overhang exception?

• A3 in. above any roof, with no limit on the length of the crossing
• B18 in. above only the overhanging portion of the roof, where no more than 6 ft of cable p…
• C24 in. above a flat roof used as a deck
• DZero clearance if the cable is lashed to a power service mast

NEC 2017 840.160 permits communications cable to carry power for premises communications equipment. Compliance with 725.144 is required when that power exceeds:

• A15 watts
• B30 watts
• C60 watts
• D100 watts

A bundle of seven 26 AWG, 4-pair Class 2 cables carries power and data above 60 W at 30°C ambient. Per NEC 2017 Table 725.144, the ampacity of each conductor is limited to:

• A0.3 A regardless of temperature rating
• B1 A for 60°C, 75°C, and 90°C rated cables
• C2 A only if the cable is Type CMX
• DThe 18 AWG value from Table 310.15(B)(16)

NEC 2017 820.21 requires coaxial installations above a suspended ceiling to be arranged so that:

• ACeiling tiles can still be removed to give access to electrical equipment behind the ceil…
• BAll coaxial cables rest directly on the ceiling grid
• CCeiling support wires of a fire-rated assembly also carry the coaxial cables
• DCables completely fill every tile opening

A mobile home has no service equipment or 250.32-grounded disconnect within 30 ft of an exterior wall. NEC 2017 820.106 requires the CATV shield ground to be bonded to the mobile-home metal frame or grounding terminal with a copper conductor not smaller than:

• A18 AWG
• B14 AWG
• C12 AWG
• D6 AWG

NEC 2017 800.156 requires which provision in a new dwelling, cabled to the service-provider demarcation point?

• AA minimum of one communications outlet in a readily accessible area
• BA 200 A service-entrance panel dedicated to video
• CA Type BM medium-power broadband riser in every bedroom
• DA rooftop antenna mast bonded only to a gas pipe

NESC 2012 Table 232-1, which is study-only material and is not allowed in the PSI center, requires insulated communication cables crossing roads, streets, alleys, or other areas subject to truck traffic to have a vertical clearance of not less than:

• A8.0 ft
• B9.5 ft
• C15.5 ft
• D23.5 ft

Under NESC 2012 Table 232-1 (study-only; not an in-center book), the vertical clearance of insulated communication cables over spaces and ways subject to pedestrians or restricted traffic only is:

• A8.0 ft
• B9.5 ft
• C15.5 ft
• D18.0 ft

On a jointly used pole, NESC 2012 Rules 235C and 238E (study-only) create a communication-worker safety zone between the supply space and the communication space. The basic vertical clearance in that zone is:

• A12 in.
• B30 in.
• C40 in.
• D8 ft

NESC 2012 Rule 231 (study-only) requires supporting structures, guys, and attached equipment to be located at least which distance from a fire hydrant, unless conditions do not permit that spacing?

• A1 ft
• B3 ft, with 4 ft preferred
• C4 ft, reduced to not less than 3 ft where conditions do not permit
• D10 ft in all cases

NESC 2012 Table 352-1 (study-only) treats which burial depth as adequate for direct-buried supply cable or conductor rated 0 to 600 V, a depth also used as the ordinary communication-cable cover?

• A6 in. (150 mm)
• B12 in. (300 mm)
• C24 in. (600 mm)
• D42 in. (1070 mm)

On a jointly used pole, NESC 2012 (study-only) places video-service communication cables in which relative location?

• AIn the supply space above the primary conductors
• BIn the communication space below the supply space, with the communication-worker safety z…
• CLashed directly to the uninsulated primary
• DAnywhere on the pole because NESC does not address joint use

What is the standard characteristic impedance of coaxial cable used for CATV and video service networks?

• A50 ohms
• B75 ohms
• C100 ohms
• D300 ohms

Which connector is the standard 75-ohm interface on CATV drop cable and subscriber outlets?

• AType N 50-ohm
• BF-type
• CRJ45 8P8C
• DSO-239 UHF

Which coaxial construction is the ordinary CATV subscriber drop?

• ARG-58 50-ohm
• BRG-59 75-ohm, used for long modern CATV trunks
• CRG-6 75-ohm
• DRG-8 50-ohm

The center conductor of a typical Series 6 (RG-6) CATV drop is which size?

• A24 AWG
• B22 AWG
• C18 AWG
• D10 AWG

A 400 ft underground subscriber drop must stay inside a 10 dB cable-loss budget at 750 MHz. The RG-6 being used is rated 5.65 dB/100 ft at 750 MHz, and the RG-11 is rated 3.65 dB/100 ft. Which statement is correct?

• ARG-6 meets the budget because 400 ft of that cable loses only 5.65 dB
• BRG-11 meets the budget because 400 ft of that cable loses only 3.65 dB
• CRG-6 meets the budget at 22.6 dB because any drop under 500 ft is acceptable
• DNeither cable meets a 10 dB budget at 400 ft (RG-6 = 22.6 dB, RG-11 = 14.6 dB), so the dr…

A 3 dB reduction in RF power is equal to:

• ANo change in power
• BOne-half the power
• COne-tenth the power
• DOne-hundredth the power

A trunk amplifier output is +40 dBmV. After a device that inserts 10 dB of loss, the level is +30 dBmV. The remaining power is what fraction of the amplifier output power?

• AOne-half
• BOne-fourth
• COne-tenth
• DOne-hundredth

A 250 ft RG-6 drop is rated 6.0 dB/100 ft at 750 MHz. Ignoring connectors, the cable attenuation at 750 MHz is:

• A6.0 dB
• B9.0 dB
• C15.0 dB
• D24.0 dB

A tap port delivers +18.0 dBmV at 750 MHz into 180 ft of RG-6 rated 5.65 dB/100 ft, then a four-way splitter specified at 7.5 dB insertion loss. What level arrives at one splitter output, ignoring connector loss?

• A+10.5 dBmV
• B+7.3 dBmV
• C+0.3 dBmV
• D−7.5 dBmV

Why is a two-way CATV splitter typically specified at about 3.5 to 4.0 dB instead of a theoretical 3.0 dB?

• ABecause it doubles the signal
• BBecause real splitters have excess insertion loss beyond a perfect equal power split
• CBecause F-connectors add 10 dB each
• DBecause 75-ohm cable cannot be split

Compared with a two-way splitter, a four-way CATV splitter serving four equal outlets will show approximately how much insertion loss per port?

• A1 dB
• B3 dB
• C7 to 8 dB
• D20 dB