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Free RCDD Practice Questions

10 free, exam-style Registered Communications Distribution Designer (RCDD) practice questions with answers and explanations. No signup required. Work through them below, then take the full free RCDD practice test to study every exam domain.

Question 1

An RCDD designs a horizontal run with an 87 m permanent link. The TR patch cord is 5 m and the work area equipment cord is 6 m. Is this channel compliant?

  1. Yes, because the total is 98 m which is under 100 m
  2. No, because the combined cord length of 11 m exceeds the 10 m maximum
  3. Yes, because each cord is under 10 m individually
  4. No, because the permanent link exceeds 85 m
Show answer & explanation

Correct answer: B - No, because the combined cord length of 11 m exceeds the 10 m maximum

Question 2

An RCDD needs to route 10 Cat 6A cables through a single conduit. Each cable has an outer diameter of 7.9 mm (cross-sectional area ≈ 49 mm²). What is the minimum conduit trade size? (Total cable area = 490 mm²; required conduit area = 490 ÷ 0.40 = 1,225 mm²)

  1. 35 mm (1-1/4 in) - 966 mm² internal area
  2. 41 mm (1-1/2 in) - 1,314 mm² internal area
  3. 53 mm (2 in) - 2,165 mm² internal area
  4. 27 mm (1 in) - 557 mm² internal area
Show answer & explanation

Correct answer: B - 41 mm (1-1/2 in) - 1,314 mm² internal area

Question 3

A singlemode fiber link is 2,000 m long with 3 connector pairs and 2 fusion splices. Calculate the maximum loss at 1310 nm. (Fiber: 0.5 dB/km; Connectors: 0.75 dB; Splices: 0.3 dB)

  1. 2.85 dB
  2. 3.85 dB
  3. 4.85 dB
  4. 1.85 dB
Show answer & explanation

Correct answer: B - 3.85 dB

Question 4

All of the following are components of a TIA-607 telecommunications grounding system EXCEPT:

  1. Telecommunications Main Grounding Busbar (TMGB)
  2. Telecommunications Grounding Busbar (TGB)
  3. Telecommunications Bonding Backbone (TBB)
  4. Uninterruptible power supply (UPS)
Show answer & explanation

Correct answer: D - Uninterruptible power supply (UPS)

Question 5

A building uses the space above a suspended ceiling as a return air plenum for HVAC. According to the NEC, telecommunications cables installed in this space must carry which minimum rating?

  1. CM (Communications - General Purpose)
  2. CMR (Communications - Riser)
  3. CMP (Communications - Plenum)
  4. CMX (Communications - Residential)
Show answer & explanation

Correct answer: C - CMP (Communications - Plenum)

Question 6

A PTZ (pan-tilt-zoom) IP security camera requires 55W. Which PoE standard is needed?

  1. 802.3af PoE (15.4W maximum)
  2. 802.3at PoE+ (30W maximum)
  3. 802.3bt Type 3 (60W)
  4. 802.3bt Type 4 (90W maximum)
Show answer & explanation

Correct answer: C - 802.3bt Type 3 (60W)

Question 7

An RCDD is designing a 5-story building. Each floor is 18,000 sq ft of usable space. How many TRs are needed in total for the building?

  1. 5 (one per floor)
  2. 10 (two per floor)
  3. 15 (three per floor)
  4. 20 (four per floor)
Show answer & explanation

Correct answer: B - 10 (two per floor)

Question 8

An RCDD writes: 'Provide Corning Altos outdoor loose-tube fiber cable, or approved equal meeting the specified performance requirements.' This is an example of:

  1. A proprietary specification
  2. A performance specification
  3. An open specification
  4. An 'or equal' specification
Show answer & explanation

Correct answer: D - An 'or equal' specification

Question 9

The RCDD inspects a plenum space and finds CM-rated cable installed instead of CMP-rated cable. This is:

  1. Acceptable since the cable is communications-rated
  2. A code violation requiring CMP-rated cable
  3. Acceptable if the cable run is short
  4. Only a violation for backbone cables
Show answer & explanation

Correct answer: B - A code violation requiring CMP-rated cable

Question 10

A final inspection reveals that the contractor installed the correct cable category but from two different manufacturers in the same system. This may affect:

  1. Nothing - any manufacturer's cable is interchangeable
  2. System warranty eligibility
  3. Only the cable color consistency
  4. Only the labeling scheme
Show answer & explanation

Correct answer: B - System warranty eligibility

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