Week 23 Chapter 12 - Pages 12-1 - 12-48

Question 1

The term “soft digging” describes the use of _____ for the purpose of locating underground utilities.

a. Surface geophysical techniques
b. Surveying
c. Energy-field detection
d. Vacuum-excavation

Answer 1

d. Vacuum-excavation

p 12-26

Locating by the use of nondestructive vacuum-excavation (also known as soft digging) equipment, or other means, to expose buried utilities at critical points.

Question 2

Entrance facility underground conduit entering a building at ceiling height should terminate _____ inches below the finished ceiling height.

a. 4
b. 6
c. 8
d. 12

Answer 2

a. 4

p 12-22

Ceiling height to terminate ≈101.6 mm (4 in) below the finished ceiling.

The ICT distribution designer should design conduits entering from:
• Basement wall to terminate ≈101.6 mm (4 in) from the finished wall.
• Below grade point to extend ≈101.6 mm (4 in) above finished floor (AFF).

Question 3

When sizing underground entrance conduits, the designer should specify a minimum of _____ 103 metric designator (4 trade size) conduits for each telecommunications service entrance point.

a. 4 plus 2 spare
b. 4 plus 1 spare
c. 3 plus 1 spare
d. 2 plus 2 spare

Answer 3

b. 4 plus 1 spare

p 12-6

The ICT distribution designer should specify a minimum of four 103 metric designator (4 trade size) conduits. One spare 103 metric designator (4 trade size) conduit should be considered for each telecommunications service entrance point.

Question 4

BICSI recommends that unlisted outside plant cable either be terminated or transitioned to listed cable ___ from its point of entrance into a building.

a. Within 15 m (50 ft)
b. As close as practical

Answer 4

b. As close as practical

p 12-18

BICSI recommends that unlisted, OSP-type cable be terminated or transitioned to listed cable as close as practical upon entry to the building. Per the restrictions of some local AHJs, this termination or transition may not exceed ≈15 m (50 ft) from the point of entrance.

Question 5

A vertical conduit mast attached to a 50 mm (2 in) grounded galvanized iron pipe is suitable for drop-wire attachments of up to ___ lines.

a. Eight
b. Six
c. Four
d. Two

Answer 5

c. Four

p 12-13

This arrangement is limited to drop-wire attachments of up to four lines.

Question 6

All maintenance holes (MHs) should be equipped with a sump at least _____ in diameter.

a. 457 mm (18 in)
b. 381 mm (15 in)
c. 330 mm (13 in)
d. 279 mm (11 in)

Answer 6

c. 330 mm (13 in)

p 12-41

A sump at least ≈330 mm (13 in) in diameter or 13 x 13 square for ease of drainage

Question 7

As an alternative to the traditional backhoe, _____ is the best excavation tool for placing a small conduit or direct-buried cable in the ground.

a. A chain-drive tiller
b. Directional drilling
c. A compact trencher
d. A vibratory plow

Answer 7

d. A vibratory plow

p 12-30

A vibratory plow is best for placing a small conduit or a direct-buried cable. Interchangeable blades for various types of cables are available. Some vibratory plows are equipped to place warning tape above the conduit or cable they are placing.

Question 8

Direct-buried cabling is considered to be _____ for future service reinforcement or changes.

a. Inflexible
b. Flexible

Answer 8

a. Inflexible

p 12-3

The disadvantages of direct-buried cabling are that it:
• May be inflexible for future service reinforcement or changes.
• Does not provide physical protection to the cable sheath.

Question 9

When placing an entrance sleeve through a building wall for outside plant cable entry, the sleeve must be:

a. Recessed slightly on the outside of the wall and recessed slightly on the inside of the wall
b. Flush with the wall on the inside and flush with the wall on the outside
c. Flush with the wall on the inside and recessed slightly on the outside of the wall
d. Flush with the wall on the outside and recessed slightly on the inside of the wall

Answer 9

d. Flush with the wall on the outside and recessed slightly on the inside of the wall

p 12-14 Figure 12.6

Question 10

Radio waves can take different paths for a transmission medium to a radio receiver. Long-distance communications use _____ waves or direct waves for transmission.

a. Ground
b. Sky

Answer 10

b. Sky

p 16-10

Long-distance communications usually use sky waves or direct waves for transmission. Sky waves (see Figure 16.4) are defined as waves that are usable due to reflection and refraction in the ionosphere:

Question 11

Sectionalizing conduits used for outside plant underground telecommunications service with traditional polyethylene tube or fabric mesh innerduct ___ the amount of cables that can be placed in the conduit.

a. Has no effect on
b. Decreases
c. Increases

Answer 11

c. Increases

p 12-6

Sectionalizing conduits with traditional polyethylene tube or fabric mesh innerduct greatly increases the amount of cables that can be placed in the conduit.

Question 12

The term entrance _____ refers to inside cabling used to connect to the access provide circuits serving a building.

a. Network
b. Facility
c. Interface
d. Bridge

Answer 12

d. Bridge

p 12-24

Interior applications may consist of separate terminating hardware for both the NI (e.g., AP circuit) and the switch or inside cabling (sometimes called the entrance bridge). Other interior NIs can be a direct connection to equipment.

Question 13

When the joint trench method is used, a minimum separation distance of _____ of concrete must exist between telecommunications facilities and power conduits.

a. 305 mm (12 in)
b. 152 mm (6 in)
c. 101.6 mm (4 in)
d. 77 mm (3 in)

Answer 13

d. 77 mm (3 in)

p 12-28 Table 12.3

Question 14

All communications poles of the same class used for aerial plant must be able to withstand the same horizontal load applied _____ from the top of the pole.

a. 1219 mm (49 in)
b. 914 mm (36 in)
c. 610 mm (24 in)
d. 305 mm (12 in)

Answer 14

c. 610 mm (24 in)

p 12-47

All poles of the same class, regardless of length and timber species, must be able to withstand the same horizontal load applied ≈610 mm (24 in) from the top of the pole.

Question 15

The color _____ has been adopted by the Common Ground Alliance for warning tape buried above telecommunications and CATV cables.

a. White
b. Yellow
c. Red
d. Orange

Answer 15

d. Orange

p 12-27

The Common Ground Alliance has adopted the color orange for telecommunications and CATV cables.

Question 16

All communications poles of the same class used for aerial plant must be able to withstand the same ___ load applied 610 mm (24 in) from the top of the pole.

a. Vertical
b. Horizontal

Answer 16

b. Horizontal

p 12-47

Question 17

Buildings larger than _____ must contain a dedicated room for the termination of entrance facilities.

a. 5529 square m (60,000 square ft)
b. 7389 square m (80,000 square ft)
c. 9300 square m (100,000 square ft)
d. 11,160 square m (120,000 square ft)

Answer 17

c. 9300 square m (100,000 square ft)

p 12-21

Terminating space should be located in a dedicated area of an ER or a TR if a separate room is not allocated for EFs. Buildings larger than ≈9290 m2 (100,000 ft2) must contain a dedicated room for EFs.

Question 18

The MAXIMUM span length for an aerial entrance, from the last pole to the building, must NOT exceed:

a. 15.2 m (50 ft)
b. 30 m (100 ft)
c. 45.8 m (150 ft)
d. 61 m (200 ft)

Answer 18

b. 30 m (100 ft)

p 12-10

When aerial entrances are used, the span from the last pole to the building must not exceed ≈30.5 m (100 ft).

Question 19

When selecting poles for aerial telecommunications facilities, which of the following is the class number for the strongest rated pole?

a. 10
b. 8
c. 4
d. 1

Answer 19

d. 1

p 12-47

Specify poles by strength or class number (e.g., the strongest-rated communications pole is class 1 and the weakest-rated pole is 10) and length (e.g., ≈10.7 m [35 ft] class 6).

Question 20

To reduce the chance of an accidental dig-up, plastic warning tape should be placed a MINIMUM of _____ below grade, but high enough above cables to allow detection before cables are damaged.

a. 101 mm (4 in)
b. 203 mm (8 in)
c. 300 mm (12 in)
d. 381 mm (15 in)

Answer 20

c. 300 mm (12 in)

p 12-27

To reduce the chance of an accidental dig-up, place plastic warning tape a minimum of ≈305 mm (12 in) below grade but high enough above cables to allow detection before cables are damaged.

Question 21

Which one of the following is NOT an advantage of underground conduit?

a. Has a low initial installation cost
b. Preserves the aesthetic appearance of the premises
c. Adaptable for future placement or removal of facilities
d. Provides the security of additional physical cable protection

Answer 21

a. Has a low initial installation cost

p 12-2

The disadvantages of underground conduit are that they:
• Have a high initial installation cost.
• Require careful route planning.
• Provide a possible path for water or gas to enter the building if improperly sealed.
• Usually require more installation time than aerial or direct-buried installations.