Nicet Level 1 - Water Based Layout Practice Exam Questions And Answers

Nicet Level 1 - Water Based Layout Practice Exam Questions And Answers Which of the following standards contain reqs. pertaining to the installation of underground piping? - answer -NFPA 13 & 24 (Both in Chapter 10) Which of the following should you inspect on an extension cord before each use? - answer -The grounding prong & the insulation for nicks, cuts, or damage ________ indicates a mandatory req. according to NFPA definitions. - answer -Shall. (Ref. NFPA 13 2016, Sec. 3.2.4.) 100 GPM is flowing through 100' of 1 1/4 in. Sch. 40 pipe. How many feet of 1 1/2 in. pipe will produce the same friction loss? - answer -Assume this is Schedule 40 pipe, C = 120. Use the Hazen-Williams formula to calculate the friction loss for the 1 ¼ in. pipe and the 1 ½ in. pipe. For 1 ¼ in. pipe (ID = 1.38): P friction loss = 4.52 x Q 1.85 c 1.85 x d 4.87 P friction loss = 4.52 x 100 1.85 120 1.85 x 1.38 4.87 P friction loss = 0.672 psi/ft For 1 ½ in. pipe (ID = 1.61): P friction loss = 4.52 x Q 1.85 c 1.85 x d 4.87 P friction loss = 4.52 x 100 1.85 120 1.85 x 1.61 4.87 P friction loss = 0.317 psi/ft Step #2: Determine the total friction loss for 100 gpm flowing through 100 ft. of 1 ¼ in. Schedule 40 black steel pipe: 100 ft. x 0.672 psi/ft = 67.2 psi Step #3: Determine the pipe length to produce the same friction loss in the 1 ½ in. pipe: y ft. x 0.317 psi/ft = 67.2 psi y = 67.2 ÷ 0.317 y = 212 ft. A basic contract: (choose all that apply) - answer -Contains the names of the parties involved, References the contract documents, Discusses the work that is to be done, and Discusses start and completion dates. Define both the constant, y, and the exponent ,z, for q in the Hazen-Williams friction loss formula shown Below: P = L x (y x Q^z) (c^1.85 x d^4.87) - answer -4.52, 1.85. Reference NFPA 13 2016 Section 23.4.2.1.1. A water flow test was conducted using 1 hydrant, flowing with two 2 1/2 inch outlets. Which is the approximate water flow rate, if the pitot reading was 15 psi. The hydrant outlet coefficiant is 0.8. - answer -The correct answer is 1156 gpm. Solution #12: Q 1 = 29.84 cd 2 √ P Q 1 = 29.84 x 0.8 x (2.5) 2 x √15 Q 1 = 577.8 gpm Both outlets are 2 ½ in., with the same outlet coefficient. Therefore, Q 1 = Q 2 The total flow rate is then: Q 1 + Q 2 = Q total Q total = 577.85 gpm + 577.85 gpm = 1155.70 gpm, round up to 1156 gpm Toggle hangers shall be permitted only for the support of pipe __________ inches or smaller in size under ceilings of hollow tile or metal lath and plaster. - answer -1 2/2 in. (ref. NFPA 13 2016 Sec. 9.2.1.1.2. While conducting a flow test, the chosen hydrant should be ______ - answer -As close to the property where the sprinkler system is being installed. (Ref, NFPA 13 Sec. A.24.2.2. or NFPA 291) What formula is used to determine the discharge coefficiant relating pressure and flow rate? - answer -K = Q / (Square root of P) What best describes a tree system? - answer -Cross mains and the branch lines are not tied together, providing only one path of water flow. Factors that define Occupancy Group Hazard 2 include: - answer -Quantity and combustibility of contents are moderate to high. Stockpiles of contents with moderate rates of heat release do not exceed 12 ft and stockpiles with high heat release do not exceed 8 ft (Ref NFPA 13 Sec. 5.3.2) If a cross main in a ________ pipe sprinkler system has three branch lines per bay, one intermediate hanger shall be permitted to be omitted, if a branch line hanger is installed on the starter peice. - answer -Steel. Reference NFPA 13 2016, Section 9.2.4.3. NFPA 13 specifies the depth of cover fro underground pipe of a minimum of 2 1/2 ft, 3 ft. under driveways and 4 ft. under railroads tracks. However, it must be at least 1ft. below the frost line. If the frost line is 2 1/2 ft, what is the minimum depth of cover under a driveway? - answer -3 ½ ft. Reference NFPA 13 2016, Section 10.4. If you are laying pipes under driveways, you must go down a minimum of 3 ft. However, you must be at least 1 ft. below the frost line. In this case that is 3 ½ ft.