RCDD Chapter 6
Chapter 6
- 1.
Acoustic noise levels in the telecommunications spaces should be kept to a minimum by locating noise generating equipment (e.g. photocopy equipment, high-speed printers) outside the telecommunication space.
- A.
True
- B.
False
Correct Answer
A. True -
- 2.
To facilitate cabling administration you should use what type of cross-connect fields?
- A.
Numbered
- B.
Color-coded
- C.
Lettered
- D.
Symbolized
Correct Answer
B. Color-coded -
- 3.
For branch circuits of 5 kVA or less, the designer should consider a physical seperation of ________ between the telecommunications cabling and power cabling.
- A.
26 mm (1 in)
- B.
52 mm (2 in)
- C.
78 mm (3 in)
- D.
108 mm (4 in)
Correct Answer
B. 52 mm (2 in) -
- 4.
Space should be provided for an aisle of at least ________ wide in the front and in the rear of the space for each equipment rack, cabinet, or enclosure.
- A.
0.5 m (1.5 ft)
- B.
0.75 m (2 ft)
- C.
1 m (3.28 ft)
- D.
1.2 m (4.25 ft)
Correct Answer
C. 1 m (3.28 ft) -
- 5.
In corners, a minimum side clearance of _________ is recommended.
- A.
156 mm (6 in)
- B.
225 mm (9 in)
- C.
305 mm (12 in)
- D.
380 mm (15 in)
Correct Answer
C. 305 mm (12 in) -
- 6.
If possible, sleeves, slots, and/or conduits should be located where? This placement enhances the use of the wall space from left to right.
- A.
On the left side of the room
- B.
On the right side of the room
- C.
As close to the equipment rack as possible
- D.
In the corner of the room
Correct Answer
A. On the left side of the room -
- 7.
Trays and conduits located within the ceiling should protrude how far into the room without a bend.
- A.
25 mm (1 in) to 76 mm (3 in)
- B.
51 mm (2 in) to 102 mm (4 in)
- C.
25 mm (1 in) to 51 mm (2 in)
- D.
51 mm (2 in) to 76 mm (3 in)
Correct Answer
C. 25 mm (1 in) to 51 mm (2 in) -
- 8.
Trays and conduits located within the ceiling should enter the telecommunication room above what height.
- A.
2.4 m (8 ft)
- B.
3 m (10 ft)
- C.
3.6 m (12 ft)
- D.
4.2 m (14 ft)
Correct Answer
A. 2.4 m (8 ft) -
- 9.
Three basic types of steel conduit in use today are:
- A.
Rigid metal conduit (RMC)
- B.
Intermediate metal conduit (IMC)
- C.
Flexible metal conduit (FMC)
- D.
Electrical metallic tubing (EMT)
Correct Answer(s)
A. Rigid metal conduit (RMC)
B. Intermediate metal conduit (IMC)
D. Electrical metallic tubing (EMT) -
- 10.
Select the characteristics for Electrical metallic tubing (EMT)
- A.
Commonly called thin-wall
- B.
A steel raceway of circular cross section, which is unthreaded
- C.
Normally 2 m (6.3 ft) long
- D.
Commonly called thick-wall
- E.
Normally 3 m (10 ft) long
Correct Answer(s)
A. Commonly called thin-wall
B. A steel raceway of circular cross section, which is unthreaded
E. Normally 3 m (10 ft) long -
- 11.
Sleeves and slots may be left open after cable installation.
- A.
True
- B.
False
Correct Answer
B. False -
- 12.
The size and number of conduits or sleeves used for backbone pathways depends on the usable floor space served by the backbone system. However, at least ________ sleeves are recommended to serve a TR, ER or EF.
- A.
Three 100 mm (4 trade size)
- B.
Three 75 mm (3 trade size)
- C.
Four 75 mm (3 trade size)
- D.
Four 100 mm (4 trade size)
Correct Answer
D. Four 100 mm (4 trade size) -
- 13.
When installing doors in telecommunications spaces, the door should be:
- A.
At least 1.03 m ( 3.5 ft) wide and 2 m (6.6 ft) high
- B.
Doors should also have the same fire rating as the walls in the room
- C.
At least 0.91 m (3 ft) wide and 2 m (6.6 ft) high
- D.
Doors should have double the fire rating of the walls in the room
Correct Answer(s)
B. Doors should also have the same fire rating as the walls in the room
C. At least 0.91 m (3 ft) wide and 2 m (6.6 ft) high -
- 14.
Which of the following apply to doors:
- A.
Doorsills are recommended
- B.
Doorsills are not recommended
- C.
Removable center posts are permitted if required
- D.
Removable center posts are not permitted
- E.
Doors should be installed to either slide side-to-side or be removable
Correct Answer(s)
B. Doorsills are not recommended
C. Removable center posts are permitted if required
E. Doors should be installed to either slide side-to-side or be removable -
- 15.
Telecommunications spaces must be equipped with a minimum of ______ dedicated, nonswitched alternating current (ac) duplex receptacles for equipment power, each on individual branch circuits.
- A.
1
- B.
2
- C.
4
- D.
6
Correct Answer
B. 2 -
- 16.
In telecommunications spaces, separate duplex convenience receptacles (e.g. for tools, field test equipment) must be:
- A.
Located at least 100 mm (4 in) AFF
- B.
Located at least 152 mm (6 in) AFF
- C.
Placed at 1.83 m (6 ft) intervals around perimeter walls
- D.
Placed at 2.12 m (10 ft) intervals around perimeter walls
Correct Answer(s)
B. Located at least 152 mm (6 in) AFF
C. Placed at 1.83 m (6 ft) intervals around perimeter walls -
- 17.
In telecommunications spaces at least two receptacles should be on emergency power, if available.
- A.
True
- B.
False
Correct Answer
B. False -
- 18.
HVAC should maintain a continuous and dedicated environmental control (e.g. 24 hours per day, 365 days per year)
- A.
True
- B.
False
Correct Answer
A. True -
- 19.
HVAC should maintain a positive pressure with a minimum of ____ air change per hour in the telecommunications space.
- A.
1
- B.
2
- C.
3
- D.
4
Correct Answer
A. 1 -
- 20.
The temperature range for telecommunications spaces that do not contain active equipment should be:
- A.
5 to 25 degrees C (40 to 90 degrees F)
- B.
15 to 35 degrees C (60 to 95 degrees F)
- C.
10 to 35 degrees C (50 to 95 degrees F)
- D.
18 to 24 degrees C (64 to 75 degrees F)
Correct Answer
C. 10 to 35 degrees C (50 to 95 degrees F) -
- 21.
The temperature range for telecommunications spaces that house active equipment should be:
- A.
20 to 27 degrees C (67 to 83 degrees F)
- B.
15 to 35 degrees C (60 to 95 degrees F)
- C.
10 to 35 degrees C (50 to 95 degrees F)
- D.
18 to 24 degrees C (64 to 75 degrees F)
Correct Answer
D. 18 to 24 degrees C (64 to 75 degrees F) -
- 22.
A fire alarm should be installed in a telecommunications space according to national and local codes.
- A.
True
- B.
False
Correct Answer
A. True -
- 23.
Portable fire extinguishers in telecommunications spaces should be mounted where?
- A.
As close to the source of the fire as possible.
- B.
As close to the telecommunications equipment as possible
- C.
As close to the entrance as possible
- D.
As close to the corner of the room
Correct Answer
C. As close to the entrance as possible -
- 24.
Select the characteristics for lighting in telecommunications spaces:
- A.
Dimmers are allowed
- B.
Locate lighting switches near the entrance to the space
- C.
Locate light fixtures a minimum of 2.6 m (8.5 ft) AFF and coordinate closely with the rack, cabinet, or enclosure placements
- D.
Provide a minimum equivalent of 400 lux (40 foot-candles) measured at the point of cable termination
- E.
Provide a minimum equivalent of 500 lux (50 foot-candles) measured at the point of cable termination
Correct Answer(s)
B. Locate lighting switches near the entrance to the space
C. Locate light fixtures a minimum of 2.6 m (8.5 ft) AFF and coordinate closely with the rack, cabinet, or enclosure placements
E. Provide a minimum equivalent of 500 lux (50 foot-candles) measured at the point of cable termination -
- 25.
When planning the lighting for telecommunications spaces you should coordinate the lighting layout with the equipment layout (especially overhead cable trays) to ensure that lighting from light fixtures is not obstructed.
- A.
True
- B.
False
Correct Answer
A. True -
- 26.
When sizing telecommunications spaces, if the area being served is 460 m^2 (5000 ft^2) or less, then the interior dimensions of the telecom room must be at least:
- A.
2.4 m (8 ft) x 2.4 m (8 ft)
- B.
3 m (10 ft) x 2.4 m (8 ft)
- C.
3 m (10 ft) x 2.74 m (9 ft)
- D.
3 m (10 ft) x 3.4 m (11 ft)
Correct Answer
B. 3 m (10 ft) x 2.4 m (8 ft) -
- 27.
When sizing telecommunications spaces, if the area being served is larger than 460 m^2 and less than or equal to 740 m^2 (>5000 ft^2 to 8000ft^2), then the interior dimensions of the telecom room must be at least:
- A.
3 m (10 ft) x 2.4 m (8 ft)
- B.
3 m (10 ft) x 3.4 m (11 ft)
- C.
3 m (10 ft) x 3 m (10 ft)
- D.
3 m (10 ft) x 2.74 m (9 ft)
Correct Answer
D. 3 m (10 ft) x 2.74 m (9 ft) -
- 28.
When sizing telecommunications spaces, if the area being served is larger than 740 m^2 and less than or equal to 929 m^2 (>8000 ft^2 to 10,000ft^2), then the interior dimensions of the telecom room must be at least:
- A.
3 m (10 ft) x 3.4 m (11 ft)
- B.
3 m (10 ft) x 3.8 m (12 ft)
- C.
3.8 m (12 ft) x 3.8 m (12 ft)
- D.
3.8 m (12 ft) x 4.6 m (14 ft)
Correct Answer
A. 3 m (10 ft) x 3.4 m (11 ft) -
- 29.
When sizing telecom spaces in smaller buildings, if the building is smaller than 460 m^2 (5000 ft^2) it may be served by:
- A.
A shallow room at least 0.6 m (2 ft) x 1.83 m (6 ft) wide
- B.
A shallow room at least 1.2 m (4 ft) x 1 m (3.28 ft) wide
- C.
A shallow room at least 0.6 m (2 ft) x 2.6 m (8.5 ft) wide
- D.
A shallow room at least 1.2 m (4 ft) x 3 m (10 ft) wide
Correct Answer
C. A shallow room at least 0.6 m (2 ft) x 2.6 m (8.5 ft) wide -
- 30.
When sizing telecom spaces, if the building is smaller than 93 m^2 (1000 ft^2), it may be served by:
- A.
A shallow room at least 0.6 m (2 ft) x 2.6 m (8.5 ft) wide
- B.
Wall cabinets
- C.
Self-contained cabinets
- D.
Enclosed cabinets
Correct Answer(s)
B. Wall cabinets
C. Self-contained cabinets
D. Enclosed cabinets -
- 31.
For existing installations, if, for reasons beyond the control of the designer, the minimum size guidelines cannot be met, 1.2 m (4ft) depth by 1.83 m (6 ft) width by 2.6 m (8.5 ft) height (inside dimensions) of the telecommunications space should be provided with sliding double 914 mm (36 in) doors for every 240, 4-pair cable termination served.
- A.
True
- B.
False
Correct Answer
A. True -
- 32.
When allocating termination space for balanced twisted-pair, you should allow how much space for each 4-pair circuit to be patched or cross-connected.
- A.
1300 mm ^2 (2 in^2)
- B.
2580 mm^2 (4 in^2)
- C.
3820 mm^2 (6 in^2)
- D.
5034 mm^2 (8 in^2)
Correct Answer
B. 2580 mm^2 (4 in^2) -
- 33.
When allocating termination space for optical fiber, you should allow how much space for each optical fiber core/strand to be patched or cross-connected.
- A.
1300 mm ^2 (2 in^2)
- B.
2580 mm^2 (4 in^2)
- C.
3820 mm^2 (6 in^2)
- D.
5034 mm^2 (8 in^2)
Correct Answer
A. 1300 mm ^2 (2 in^2) -
- 34.
The telecommunications space must not be used to store any substances that are corrosive, combustible, or explosive. Examples of these prohibited substances include:
- A.
Cleaning chemicals (e.g. acid, ammonia chlorine)
- B.
Office and computer supplies (e.g. paper, copier/printer fluids)
- C.
Groundskeeping chemicals (e.g. fertilizer, ice melt)
- D.
Hazardous materials (e.g. asbestos)
- E.
All of the above
Correct Answer
E. All of the above -
- 35.
Whenever possible, space should be located for terminations of each type of cable on one continuous wall or in a rack, cabinet or enclosure. The designer should plan for a clear space of ______________ above and below the top and bottom of the connecting hardware for cable handling.
- A.
76 mm (3 in) to 127 mm (5 in)
- B.
69 mm (2 in) to 118 mm (4 in)
- C.
127 mm (5 in) to 152 mm (6 in)
- D.
152 mm (6 in) to 184 mm (7 in)
Correct Answer
C. 127 mm (5 in) to 152 mm (6 in) -
- 36.
Corners result in __________ of lost space on each wall and make ring runs necessary.
- A.
127 mm (5 in)
- B.
152 mm (6 in)
- C.
278 mm (10 in)
- D.
305 mm (12 in)
Correct Answer
D. 305 mm (12 in) -
- 37.
Racks, cabinets, and enclosures should be 2.1 m (7 ft) by 483 mm (19 in), and have what mounting hole spacings:
- A.
Repetitive 27 mm (1 in) and 12.7 mm (1/2 in) spacing
- B.
Repetitive 32 mm (1 1/4 in) and 12.7 mm (1/2 in) spacing
- C.
A common variation of 16 mm (5/8 in) and 16 mm (5/8 in) and 12.7 mm (1/2 in)
- D.
A common variation of 16 mm (5/8 in) and 16 mm (5/8 in) and 32 mm (1 1/4 in)
Correct Answer(s)
B. Repetitive 32 mm (1 1/4 in) and 12.7 mm (1/2 in) spacing
C. A common variation of 16 mm (5/8 in) and 16 mm (5/8 in) and 12.7 mm (1/2 in) -
- 38.
For racks, cabinets and enclosures, what is the basic hole spacing pattern:
- A.
110-D
- B.
310-D
- C.
210-H
- D.
410-G
Correct Answer
B. 310-D -
- 39.
In rooms with limited floor space, what size racks, cabinets, and enclosures should be considered:
- A.
2.1 m (7 ft) by 483 mm (19 in)
- B.
2.1 m (7 ft) by 512 mm (21 in)
- C.
2.3 m (7 1/2 ft) by 483 mm (19 in)
- D.
2.3 m (7 1/2 ft) by 512 mm (21 in)
- E.
2.4 m (8 ft) by 483 mm (19 in)
Correct Answer(s)
C. 2.3 m (7 1/2 ft) by 483 mm (19 in)
E. 2.4 m (8 ft) by 483 mm (19 in) -
- 40.
When sizing horizontal cable management, the recommendation is one rack mounting space (RMS) panel for up to ______ patch cords and two RMS panels for up to ____ patch cords.
- A.
12, 24
- B.
24, 48
- C.
48, 60
- D.
48, 96
Correct Answer
B. 24, 48 -
- 41.
Walls in telecommunications spaces should have at least one wall lined with A/C grade or better void-free plywood, that is 2.4 m (8ft) high with a minimum thickness of 19 mm (3/4 in).
- A.
True
- B.
False
Correct Answer
B. False -
- 42.
The plywood mounted to two walls in a telecommunications space should/could:
- A.
Be covered with drywall to satisfy building code requirements in some areas.
- B.
Installed with the grade A surface not exposed
- C.
Be kiln-dried to maximum moisture content of 15%, to reduce warping
- D.
Plywood should be void-free and either fire-rated or treated on all sides with at least two coats of fire-resistant light-color paint
- E.
Have the plywood with a grade A surface exposed
Correct Answer(s)
A. Be covered with drywall to satisfy building code requirements in some areas.
C. Be kiln-dried to maximum moisture content of 15%, to reduce warping
D. Plywood should be void-free and either fire-rated or treated on all sides with at least two coats of fire-resistant light-color paint
E. Have the plywood with a grade A surface exposed -
- 43.
Although the primary function of the TR and TE is to house the HC (FD), it may also contain:
- A.
ICs (BDs)
- B.
MCs (CDs)
- C.
A TE may contain a campus EF
- D.
Passive cabling components (e.g. connecting hardware, patch cords, jumpers)
- E.
Active devices that are served by the backbone cabling
Correct Answer(s)
A. ICs (BDs)
B. MCs (CDs)
D. Passive cabling components (e.g. connecting hardware, patch cords, jumpers)
E. Active devices that are served by the backbone cabling -
- 44.
A TR may also contain a campus EF.
- A.
True
- B.
False
Correct Answer
A. True -
- 45.
There must be at least one TR and one ER per floor
- A.
True
- B.
False
Correct Answer
B. False -
- 46.
Telecommunications room guidelines: The usable floor space for a TR is:
- A.
464 m^2 (5,000 ft^2)
- B.
929 m^2 (10,000 ft^2)
- C.
1376 m^2 (15,000 ft^2)
- D.
1860 m^2 (20,000 ft^2)
Correct Answer
B. 929 m^2 (10,000 ft^2) -
- 47.
Telecommunications room guidelines: The usable floor space for a ER is:
- A.
464 m^2 (5,000 ft^2)
- B.
929 m^2 (10,000 ft^2)
- C.
1376 m^2 (15,000 ft^2)
- D.
1860 m^2 (20,000 ft^2)
Correct Answer
D. 1860 m^2 (20,000 ft^2) -
- 48.
The TE door may be hinged but must not be removable.
- A.
True
- B.
False
Correct Answer
B. False -
- 49.
A minimum of _____ dedicated, nonswitched duplex receptacles should be available for equipment power.
- A.
1
- B.
2
- C.
3
- D.
4
Correct Answer
A. 1 -
- 50.
An accessible means of disconnecting power to the TE must be provided. If standby power is available, automatic switchover of power should be provided.
- A.
True
- B.
False
Correct Answer
A. True -
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