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Free OSP Practice Questions

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

These 10 free OSP questions are organized by exam domain, so you can see how each part of the Outside Plant Designer blueprint is tested. Reveal the answer and explanation under each question.

Domain 2: Perform Site Survey

Question 1

Before any excavation, a locate request returns markings in ORANGE paint along the proposed route. According to the APWA uniform color code, these markings indicate:

  1. Electric power lines, cables, and conduit
  2. Gas, oil, steam, or petroleum lines
  3. Communication, alarm, or signal lines and conduit
  4. Reclaimed water and irrigation lines
Show answer & explanation

Correct answer: C - Communication, alarm, or signal lines and conduit

Domain 3: Select Media, Platform, and Cables

Question 2

A designer must choose the optical fiber for a 14 km outside plant backbone link with no intermediate active equipment. Which fiber is the MOST appropriate choice?

  1. OM4 multimode, because it supports the highest data rates over distance
  2. OM3 multimode, because it is laser-optimized for backbone use
  3. OS2 singlemode, because of its low attenuation over long distances
  4. OM5 multimode, because wideband operation extends its reach
Show answer & explanation

Correct answer: C - OS2 singlemode, because of its low attenuation over long distances

Question 3

A restoration crew must reconnect a severed singlemode fiber in the field within minutes, with the lowest possible insertion loss for a permanent repair. Which splicing approach should the design specify for the permanent fix?

  1. Mechanical splice, because it is faster to complete in the field
  2. Fusion splice, because it provides the lowest insertion loss
  3. Field-installable (no-polish) connector pair joined with an adapter
  4. Index-matching gel splice held by a temporary closure
Show answer & explanation

Correct answer: B - Fusion splice, because it provides the lowest insertion loss

Domain 4: Design Underground Platform and Spaces

Question 4

During design, a long conduit run is found to exceed the cable's maximum allowable pulling tension. Which design change BEST resolves the problem without changing the cable?

  1. Increase the conduit diameter along the entire run
  2. Add an intermediate pull point (maintenance hole or handhole)
  3. Specify a higher-tension pulling winch for installation
  4. Apply additional cable pulling lubricant
Show answer & explanation

Correct answer: B - Add an intermediate pull point (maintenance hole or handhole)

Domain 5: Design Buried Platform and Spaces

Question 5

A buried fiber-optic cable will be installed parallel to and in the same trench as an electric power cable. Per the NEC, what is the MINIMUM separation between the conductive optical fiber cable and the power conductors?

  1. 6 in (150 mm)
  2. 12 in (300 mm)
  3. 18 in (450 mm)
  4. 24 in (600 mm)
Show answer & explanation

Correct answer: B - 12 in (300 mm)

Question 6

A direct-buried, non-conductive (all-dielectric) fiber cable is being placed by plowing. What should the design include so the cable can be located after installation?

  1. A continuous tracer (locate) wire placed with the cable
  2. Detectable warning tape buried directly above the cable
  3. Concrete encasement along the full route
  4. Metallic armor added to the cable jacket
Show answer & explanation

Correct answer: A - A continuous tracer (locate) wire placed with the cable

Domain 6: Design Aerial Platform and Spaces

Question 7

On a joint-use pole carrying both power and communications, what is the approximate MINIMUM vertical separation required between the lowest power supply conductor and the highest communications attachment?

  1. 30 in (760 mm)
  2. 40 in (1 m)
  3. 12 in (300 mm)
  4. 60 in (1.5 m)
Show answer & explanation

Correct answer: B - 40 in (1 m)

Question 8

A new aerial route runs along an existing high-voltage transmission line, and the design must add fiber without a separate messenger strand or any metallic element in the cable. Which cable type is MOST appropriate?

  1. Optical ground wire (OPGW)
  2. Lashed loose-tube cable on EHS strand
  3. All-dielectric self-supporting (ADSS) cable
  4. Figure-8 self-supporting cable
Show answer & explanation

Correct answer: C - All-dielectric self-supporting (ADSS) cable

Domain 7: Address Infection Control Risk Assessment and Mitigation During Construction/Renovation in Healthcare Facilities

Question 9

A 12 km singlemode link operates at 1310 nm (0.35 dB/km) and contains 6 fusion splices (0.1 dB each) and 2 connector pairs (0.5 dB each). What is the approximate total link loss?

  1. 4.2 dB
  2. 5.2 dB
  3. 5.8 dB
  4. 6.4 dB
Show answer & explanation

Correct answer: C - 5.8 dB

Domain 8: Prepare Design

Question 10

After construction, a designer must verify that an installed singlemode link meets its calculated loss budget on an end-to-end basis. Which test is the correct choice for this acceptance measurement?

  1. An OTDR trace from one end only
  2. A visual fault locator (VFL) continuity check
  3. An optical loss test set (OLTS) insertion loss measurement
  4. An optical power meter reading the link's transmit level
Show answer & explanation

Correct answer: C - An optical loss test set (OLTS) insertion loss measurement

The rest of the OSP blueprint

The OSP exam also covers these domains. Drill them in the full free practice test:

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