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Free WBSL II Practice Questions

10 free, exam-style Water-Based Systems Layout Level II (WBSL II) practice questions with answers and explanations. No signup required. Work through them below, then take the full free WBSL II practice test to study every exam domain.

Question 1

A new data center requires automatic sprinkler protection, but the owner is concerned about water damage to servers caused by accidental discharge or a single physically broken sprinkler. Which system type BEST addresses this concern?

  1. Wet-pipe system
  2. Pre-action system
  3. Dry-pipe system
  4. Deluge (open-head) system
Show answer & explanation

Correct answer: B - Pre-action system

Question 2

A standard pendent sprinkler has a K-factor of 5.6 and is flowing at a pressure of 25 psi. Using Q = K√P, what is the discharge in gpm?

  1. 11.8 gpm
  2. 140.0 gpm
  3. 4.5 gpm
  4. 28.0 gpm
Show answer & explanation

Correct answer: D - 28.0 gpm

Question 3

Per NFPA 13, the maximum protection area for a single standard-spray pendent sprinkler in a Light Hazard occupancy with unobstructed, noncombustible construction is:

  1. 130 ft²
  2. 200 ft²
  3. 225 ft²
  4. 400 ft²
Show answer & explanation

Correct answer: C - 225 ft²

Question 4

Per NFPA 20, when a centrifugal fire pump is operating at 150% of its rated capacity, the net pressure it delivers must be NOT LESS THAN what percentage of its rated pressure?

  1. 50%
  2. 65%
  3. 100%
  4. 140%
Show answer & explanation

Correct answer: B - 65%

Question 5

A warehouse stores noncombustible metal automotive parts in single-layer corrugated cartons placed directly on wooden pallets. Under NFPA 13, this commodity is classified as:

  1. Class I
  2. Class II
  3. Class III
  4. Class IV
Show answer & explanation

Correct answer: A - Class I

Question 6

A public fire hydrant has a rated capacity of 750 gpm at 20 psi residual pressure. Per NFPA 291, the bonnet and nozzle caps should be painted what color?

  1. Green
  2. Red
  3. Light blue
  4. Orange
Show answer & explanation

Correct answer: D - Orange

Question 7

A sway brace is required to resist horizontal seismic forces acting parallel to (along the length of) a feed main. Which type of brace is this?

  1. Lateral (transverse) sway brace
  2. Branch-line restraint
  3. Longitudinal sway brace
  4. Four-way sway brace
Show answer & explanation

Correct answer: C - Longitudinal sway brace

Question 8

A developer is constructing a four-story apartment building, 52 ft in height above grade plane. Which NFPA standard is intended for the design of the sprinkler system in this residential occupancy?

  1. NFPA 13
  2. NFPA 13D
  3. NFPA 13R
  4. NFPA 14
Show answer & explanation

Correct answer: C - NFPA 13R

Question 9

A sprinkler is located 25 ft above the system riser. Approximately how much pressure is required to overcome this elevation?

  1. 10.8 psi
  2. 25.0 psi
  3. 57.8 psi
  4. 5.4 psi
Show answer & explanation

Correct answer: A - 10.8 psi

Question 10

A building is equipped with a standpipe system that provides only 2½-in. hose connections intended for use by the fire department and trained personnel. Per NFPA 14, this system is classified as a:

  1. Class II standpipe
  2. Class I standpipe
  3. Class III standpipe
  4. Manual wet standpipe
Show answer & explanation

Correct answer: B - Class I standpipe

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