Question 1

The point where the telephone company ends and the homeowner's interior wiring begins is called the ____________________.

Accepted Answer

The answer of The point where the telephone company ends...

Question 2

NEC 725.121(B) prohibits connecting transformers in ____________________ unless specifically listed for interconnection.

Accepted Answer

The answer of NEC 725.121(B) prohibits connecting transformers in ____________________...

Question 3

Television antennas and lead-in wires are covered under Article ____.

Accepted Answer

A)   240
B)   725
C)   810
D)   820E) A) and C)
F) B) and C)

Question 4

Never install electrical equipment, junction boxes, or conduit boxes above a ____________________ closed-in ceiling or within a wall.

Accepted Answer

permanently

Question 5

Transformers and low-voltage wiring for doorbells are classified as ____ circuits under Article 725.

Accepted Answer

A)   Class 1
B)   Class 2
C)   Class 3
D)   none of the aboveE) A) and B)
F) A) and C)

Question 6

The type of cable most often used for television signal distribution in new residences is ____.

Accepted Answer

A)   75-ohm RG6 coaxial
B)   150-ohm unshielded twisted-pair
C)   300-ohm twin-lead
D)   Type FLPE) A) and B)
F) All of the above

Question 7

Residential telephone conductor installations must be made in accordance with the requirements of ____.

Accepted Answer

A)   Article 800
B)   Article 810
C)   Article 820
D)   none of the aboveE) C) and D)
F) B) and C)

Question 8

Chime transformers used in dwellings are generally rated ____ volts.

Accepted Answer

A)   12
B)   16
C)   20
D)   24E) None of the above
F) A) and B)

Question 9

Because TV is a low-voltage system, metallic or nonmetallic standard single-gang device boxes, 4-in. square ____________________ with a plaster ring, plaster rings only, or special mounting brackets can be installed during the rough-in stage at each likely location of a television set.

Accepted Answer

The answer of Because TV is a low-voltage system, metallic...

Question 10

On the outside of a building, position and fasten lead-in conductors so they cannot swing closer than 24 in. (600 mm) to light and power conductors having not over 250 volts between conductors; 8 ft (3.0 m) if over 250 volts between conductors.

Accepted Answer

A) True 
 B)False

Question 11

A ____ is described in the NEC as any electric circuit that energizes signaling equipment.

Accepted Answer

A)   signaling circuit
B)   code-calling system
C)   signal light system
D)   code circuitE) A) and B)
F) C) and D)

Question 12

When 120-volt receptacles and TV outlets are mounted in double-gang boxes, ____ is required in the box to isolate the TV conductors from the power wiring.

Accepted Answer

A)   a metal EMI shield
B)   a barrier
C)   double-grounding
D)   double-insulationE) B) and C)
F) None of the above B

Question 13

Chime transformers are listed as ____________________ because of their low voltage rating and power limitation.

Accepted Answer

Class 2 tr...

Question 14

Keep the antenna and lead-in conductors at least 2 in. (50 mm) from other open wiring (as in old houses) unless the other wiring is in a(n) ____________________ or cable.

Accepted Answer

The answer of Keep the antenna and lead-in conductors at...

Question 15

Which of the following rules apply to coaxial cable installations under Article 820?

Accepted Answer

A)   The outer shield of the coaxial cable must be grounded close to its point of entry into the building.
B)   Coaxial cables shall not be run in the same conduits or box with electric light and power conductors.
C)   Do not support coaxial cables from raceways that contain electrical light and power conductors.
D)   all of the aboveE) All of the above
F) C) and D) D

Question 16

The article that covers cable TV wiring installations in residences is Article ____.

Accepted Answer

A)   725
B)   810
C)   820
D)   none of theseE) None of the above
F) A) and B)

Question 17

When coaxial cables are run underground, they must be separated at least ____________________ inches from underground light and power conductors, unless either the coaxial or power cables are run in a raceway.

Accepted Answer

The answer of When coaxial cables are run underground, they...

Question 18

The NEC _____ in a dwelling.

Accepted Answer

A)   requires at least one communication outlet
B)   requires one communication outlet on each floor
C)   requires one communication outlet in each habitable room.
D)   does not require a communication outletE) C) and D)
F) B) and D)

Question 19

Telephone conductors must be separated by ____________________ from light and power conductors unless the light and power conductors are in a raceway, or in Type NM cable, Type AC cable or Type UF cable.

Accepted Answer

at least 1...

Question 20

Antennas and lead-in conductors may be attached to an electric service mast if they are kept a minimum of 36 in. (900 mm) below the power conductors.

Accepted Answer

A) True 
 B)False

Exam 25: Television, Telephone, and Low-Voltage Signal Systems

The point where the telephone company ends and the homeowner's interior wiring begins is called the ____________________.

Correct AnswerverifiedShow Answer

NEC 725.121(B) prohibits connecting transformers in ____________________ unless specifically listed for interconnection.

Correct AnswerverifiedShow Answer

Television antennas and lead-in wires are covered under Article ____.

Correct AnswerverifiedShow Answer

Never install electrical equipment, junction boxes, or conduit boxes above a ____________________ closed-in ceiling or within a wall.

Correct Answerverifiedpermanently

Transformers and low-voltage wiring for doorbells are classified as ____ circuits under Article 725.

Correct AnswerverifiedShow Answer

The type of cable most often used for television signal distribution in new residences is ____.

Correct AnswerverifiedShow Answer

Residential telephone conductor installations must be made in accordance with the requirements of ____.

Correct AnswerverifiedShow Answer

Chime transformers used in dwellings are generally rated ____ volts.

Correct AnswerverifiedShow Answer

Because TV is a low-voltage system, metallic or nonmetallic standard single-gang device boxes, 4-in. square ____________________ with a plaster ring, plaster rings only, or special mounting brackets can be installed during the rough-in stage at each likely location of a television set.

Correct AnswerverifiedShow Answer

On the outside of a building, position and fasten lead-in conductors so they cannot swing closer than 24 in. (600 mm) to light and power conductors having not over 250 volts between conductors; 8 ft (3.0 m) if over 250 volts between conductors.

Correct AnswerverifiedShow Answer

A ____ is described in the NEC as any electric circuit that energizes signaling equipment.

Correct AnswerverifiedShow Answer

When 120-volt receptacles and TV outlets are mounted in double-gang boxes, ____ is required in the box to isolate the TV conductors from the power wiring.

Correct AnswerverifiedB

Chime transformers are listed as ____________________ because of their low voltage rating and power limitation.

Correct AnswerverifiedClass 2 tr...View AnswerShow Answer

Keep the antenna and lead-in conductors at least 2 in. (50 mm) from other open wiring (as in old houses) unless the other wiring is in a(n) ____________________ or cable.

Correct AnswerverifiedShow Answer

Which of the following rules apply to coaxial cable installations under Article 820?

Correct AnswerverifiedD

The article that covers cable TV wiring installations in residences is Article ____.

Correct AnswerverifiedShow Answer

When coaxial cables are run underground, they must be separated at least ____________________ inches from underground light and power conductors, unless either the coaxial or power cables are run in a raceway.

Correct AnswerverifiedShow Answer

The NEC _____ in a dwelling.

Correct AnswerverifiedShow Answer

Telephone conductors must be separated by ____________________ from light and power conductors unless the light and power conductors are in a raceway, or in Type NM cable, Type AC cable or Type UF cable.

Correct Answerverifiedat least 1...View AnswerShow Answer

Antennas and lead-in conductors may be attached to an electric service mast if they are kept a minimum of 36 in. (900 mm) below the power conductors.

Correct AnswerverifiedShow Answer

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permanently

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B

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Class 2 tr...
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D

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at least 1...
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