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FLS Main Questions and Answers Fully Solved, Exams of Advanced Education

Illinois State University (ISU)Advanced Education

FLS Main Questions and Answers Fully Solved

Typology: Exams

2024/2025

Available from 07/07/2025

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FLS Main
1. Which cable is permitted to be substituted for FPLR cable?
a. CMG
c. CMR
b. CM
d. none of the above - answerc. CMR
REF: (NEC) 760.154(D)
2. Smoke detectors shall not be installed in elevator hoistways unless the
___________.
a. building is protected by a smoke control system
b. elevator machine room is located above the hoistway
c. hoistway is less than 3 stories height
d. hoistway is sprinklered or installed to activate elevator hoistway smoke relief
equipment - answerd. hoistway is sprinklered or installed to activate elevator hoistway
smoke relief equipment
REF: (NFPA 72) 21.3.6
3. The current flowing through a 72 ohm resistor is measured and found to be 0.5 A.
What is the voltage drop at the resistor?
a. 9V
b. 90V
c. 360V
d. 36V - answerd. 36V
4. A lobby smoke detector shall be located on the ceiling within ______ feet of the
centerline of each elevator door within the elevator bank under control of the detector.
a. 5
b. 11
c. 15
d. 21 - answerd. 21
REF: (NFPA 72) 21.3.5
5. When buried in earth below 50 mm thick cinder fill, intermediate metal conduit shall
be covered _______ in. _______mm from the top.
a. 12, 300
b. 6, 150
c. 18, 450
d. 24, 600 - answerc. 18, 450
REF: (NEC) 342.10(C)
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FLS Main

  1. Which cable is permitted to be substituted for FPLR cable? a. CMG c. CMR b. CM d. none of the above - answerc. CMR REF: (NEC) 760.154(D)
  2. Smoke detectors shall not be installed in elevator hoistways unless the ___________. a. building is protected by a smoke control system b. elevator machine room is located above the hoistway c. hoistway is less than 3 stories height d. hoistway is sprinklered or installed to activate elevator hoistway smoke relief equipment - answerd. hoistway is sprinklered or installed to activate elevator hoistway smoke relief equipment REF: (NFPA 72) 21.3.
  3. The current flowing through a 72 ohm resistor is measured and found to be 0.5 A. What is the voltage drop at the resistor? a. 9V b. 90V c. 360V d. 36V - answerd. 36V
  4. A lobby smoke detector shall be located on the ceiling within ______ feet of the centerline of each elevator door within the elevator bank under control of the detector. a. 5 b. 11 c. 15 d. 21 - answerd. 21 REF: (NFPA 72) 21.3.
  5. When buried in earth below 50 mm thick cinder fill, intermediate metal conduit shall be covered _______ in. _______mm from the top. a. 12, 300 b. 6, 150 c. 18, 450 d. 24, 600 - answerc. 18, 450 REF: (NEC) 342.10(C)
  1. Chapter 17, in reference to heat detectors, defines the area which a detector shall not be installed on the ceiling and its connected vertical sidewall as ________________. a. 12 inches in from the wall and 4 inches down from the ceiling b. 4 inches in from the wall and 12 inches down from the ceiling c. less than 4 inches from the sidewall d. from 4 inches to 12 inches from the ceiling - answerc. less than 4 inches from the sidewall REF: (NFPA 72) 17.6.3.1.3.
  2. Solve for total resistance in a series circuit where R1=90 Ohms, R2= 20 Ohms, R3=55 Ohms and R4=100 Ohms. a. 120 Ohms b. 195 Ohms c. 21 Ohms d. 265 Ohms - answerd. 265 Ohms
  3. Solve for total resistance of a circuit with a 20 Ohm, 20 Ohm, and 20 Ohm resistors in parallel. a. 6.67 Ohms b. 15 Ohms c. 60 Ohms d. 8k Ohms - answera. 6.67 Ohms
  4. What kind of raceway is not permitted in a hospital patient care areas for electrical branch circuits? a. MC b. RMC c. IMC d. Nonmetallic Raceway - answerd. Nonmetallic Raceway REF: (NEC) 517.30(C)(3)(2)
  5. Documentation indicating code compliance for a Central Station Service, must be installed within __________________________ ft. of the main fire alarm system controls. a. 2 b. 3 c. 5 d. 6 - answerb. 3 REF: (NFPA 72) 26.3.4.
  6. The rating of the overcurrent protection of a piece of equipment is 100 amps. What is the minimum size copper equipment grounding conductor for the grounding of the raceway and equipment? a. #8 AWG b. #10 AWG c. #12 AWG
  1. A bonding jumper not smaller than _____ AWG copper or equivalent shall be connected between the communications grounding electrode and the power grounding electrode at the building structure serves where separate electrodes are used. a. 12 b. 10 c. 6 d. 4 - answerc. 6 REF: (NEC) 800.100(D)
  2. Under what type of coverage referred to in chapter 17 is the spacing requirements of detectors waived? a. selective coverage b. partial coverage c. non-required coverage d. total coverage - answerc. non-required coverage REF: (NFPA 72) 17.5.3.3.1 Coverage, detector
  3. When the resistance is increased, the current ________. a. increases b. decreases c. stays the same d. is shorted - answerb. decreases
  4. The minimum size of a copper equipment grounding conductor required for equipment connected to a 40 amp circuit is ______ AWG. a. 6 b. 10 c. 12 d. 16 - answerb. 10 REF: (NEC) Table 250.
  5. In Chapter 17, referencing heat detectors irregular areas, more careful plannng is needed to make certain that no spot on the ceiling is more than ______ away from a detector. a. 1/2 the listed spacing b. 2/3 the listed spacing c. 0.5 x the listed spacing d. 0.7 x the listed spacing - answerd. 0.7 x the listed spacing REF: (NFPA 72) 17.6.3.1.
  6. Reacceptance testing shall be performed after: a. Added or deleted system components b. Any modification, repair or adjustment to system hardware or wiring. c. Any change to site-specific software d. All of the above - answerd. All of the above REF: (NFPA 72) 14.4.
  1. Initiation of the alarm signal shall occur within ________ of waterflow of a sprinkler head of the smallest orifice size installed in the system. Movement of water due to waste, surges, or variable pressure shall not be indicated. a. 120 sec b. 30 sec c. 90 sec d. 10 sec - answerc. 90 sec REF: (NFPA 72) 17.12.
  2. A voltage of 0.48 V can also be expressed as: a. 4800 mV b. 480 mV c. 48 mV d. 4.8 mV - answerb. 480 mV
  3. When two or more smoke alarms are used to provide a fire warning function in a single or multiple dwelling, they shall __________. a. not be from the same manufacturer b. be synced to flash at the same rate c. be opposite colors d. be arranged so that an alarm causes all alarms to sound within the dwelling - answerd. be arranged so that an alarm causes all alarms to sound within the dwelling REF: (NFPA 72) 29.5.2.1.
  4. Class II locations are those that are hazardous because of the presence of _____. a. chemicals b. combustible dust c. cleaning supplies d. none of the above - answerb. combustible dust REF: (NEC) 502.1, 500.5(C)
  5. In a parallel circuit, current from the power supply (total current) is ______________. a. the product of the current through each branch b. less than the current through one branch c. the same through all branches d. equal to the sum of the current of each branch - answerd. equal to the sum of the current of each branch
  6. Nonpower-limited fire alarm circuits shall have overcurrent protection not to exceed _______________________ amps for No. 18 conductors. a. 5 b. 7 c. 10 d. 12 - answerb. 7
  1. The smallest conductor allowed for a non-power-limited fire protective signaling circuit is ____________ copper. a. 16 AWG c. 20 AWG b. 18 AWG d. 22 AWG - answerb. 18 AWG REF: (NEC) 760.49(A) & 760.
  2. For restorable fixed temperature, spot type heat detectors, _____________ or more detectors shall be tested on each initiating circuit annually. Different detectors shall be tested each year. Within ________ year, each detector shall have been tested. a, five, five c. two, five b. one, two d. two, four - answerc. two, five REF: (NFPA 72) 14.4.4.5(1-4)
  3. Ohm's Law may be interpreted for purposes of calculation as: a. I=VxR c. V=R/I b. V=I/R d. I=V/R - answerd. I=V/R
  4. A nonpower-limited fire alarm circuit output voltage shall not be more than _____________ volts nominal. a. 24ac c. 120ac b. 24dc d. 600ac - answerd. 600ac REF: (NEC) 760.41(A)
  5. PLFA cables passing through a floor or a wall, shall be in metal raceway or rigid nonmetallic conduit to a height of ______ feet. a. 3 c. 7 b. 5 d. 10 - answerc. 7 REF: (NEC) 760.130(B)(2)
  6. Power-limited fire alarm circuit conductors shall be at least ________ inches from conductors of any electric light, where not installed in enclosures. a. 1 c. 3 b. 2 d. 4 - answerb. 2 REF: (NEC) 760.136(G)
  1. Visible notification applicances shall be located not more than _______ feet from end of the corridor with a separation not greater than ________ feet between appliances. a. 100, 15 c. 15, 100 b. 30, 100 d. 15, 30 - answerc. 15, 100 REF: (NFPA 72) 18.5.5.5.
  2. The purpose of Class A fire alarm circuit separation is to ________. a. increase the complexity of the system c. prevent cross talk b. prevent a single event from disabling the circuit d. prevent RFI - answerb. prevent a single event from disabling the circuit REF: (NFPA 72) 12.3.
  3. Visible notification appliances located within 18 inches from the ceiling and within 16 feet of a sleeping occupant shall have an intensity of _____. a. 177 dB c. 110 cd b. 177 cd d. 110 dB - answerb. 177 cd REF: (NFPA 72) 18.5.5.7.
  4. Additional manual fire alarm boxes (pull stations) shall be provided so that the travel distance to nearest location does not exceed _____ feet on the same floor. a. 50 c. 150 b. 100 d. 200 - answerd. 200 REF: (NFPA 72) 17.14.8.
  5. A branch circuit powering a power-limited fire alarm system can be supplied by ______. a. ground fault circuit interrupters c. both ground fault interrupters and arc fault interrupters b. arc fault interrupters d. none of the above - answerd. none of the above REF: (NEC) 760.121(B)
  6. Waterflow switches used with fire alarm systems must be tested ______. a. monthly c. semi-annually b. quarterly d. annually - answerc. semi-annually
  1. When locating smoke detectors and wall partitions extend to within ________ of the ceiling height, the spaces separated by the partitions shall be considered separate rooms. a. 15 percent c. 18 percent b. 15 inches d. 18 inches - answera. 15 percent REF: (NFPA 72) 17.5.
  2. In the absence of specific performance-based design criteria, smoke detectors shall be permitted to be located using _____ spacing. a. 20 feet c. 40 feet b. 30 feet d. 50 feet - answerb. 30 feet REF: (NFPA 72) 17.7.3.2.3.
  3. Identify the Class of the following hazard: when combustible dust on electrical equipment could cause abnormal operation or failure of electrical equipment. a. Class I c. Class III b. Class II d. None of the above - answerb. Class II REF: (NEC) 502.1 or 500.5(C)(1) or (2)
  4. In Annex A smoke detectors should not be located in a direct airflow nor closer than ________. a. 2 feet from the air supply diffuser or return opening. b. 3 feet from the air supply diffuser or air return opening c. 6 feet from any air source d. 7 times the listed spacing from the diffuser or air return opening. - answerb. 3 feet from the air supply diffuser or air return opening REF: (NFPA 72) A17.7.4.
  5. Voice evacuation messages shall be preceded and followed by a minimum of _____ cycles of the emergency evacuation signal. a. 2 b. 3 c. 4 d. 5 - answera. 2 REF: (NFPA 72) 24.3.6.
  6. When installing heat detectors in high ceiling areas, which value would you multiply the listed spacing by, if the ceiling height was 15 feet? a. 0. c. 0.

b. 0. d. 0.7(S) - answerb. 0. REF: (NFPA 72) 17.6.3.5.

  1. Wall mounted visible appliances shall be mounted such that the entire lens is not less than ______ and not greater than _____ above the finished floor. a. 40", 50" c. 80", 90" b. 4", 12" d. 80", 96" - answerd. 80", 96" REF: (NFPA 72) 18.5.5.
  2. A watertight and dust tight box connector that also provides a positive ground, is commonly referred to as a _________. a. Myers Hub c. Jake b. Straight Squeeze Connector d. Set screw connector - answera. Myers Hub
  3. The operational portion of a manual fire alarm box shall be not less than _______ and not more than ______ above floor level. a. 42 inches, 48 inches c. 32 inches, 60 inches b. 3 feet, 5 feet d. 4 inches, 12 inches - answera. 42 inches, 48 inches REF: (NFPA 72) 17.14.
  4. Trouble signals and their restoration to normal shall be indicted within _____ seconds. a. 10 c. 120 b. 60 d. 200 - answerd. 200 REF: (NFPA 72) 10.14.
  5. A coded alarm signal shall consist of not less than ______ complete rounds of the number transmitted. a. 2 c. 4 b. 3 d. 5 - answerb. 3 REF: (NFPA 72) 10.11.
  6. When mechanically protecting a notification device and guards, covers or lenses are employed, they _________. a. shall be rated for a seismic zone four
  1. A copper equipment grounding conductor for a 40 amp rated circuit shall be _________. a. 12 AWG c. 8AWG b. 14 AWG d. 10 AWG - answerd. 10 AWG REF: (NEC) 250.
  2. When you install two 12 Volt batteries in series, the total voltage will be _____. a. 6 Volts c. 24 Volts b. 12 Volts - answerc. 24 Volts
  3. A series circuit has a power source of 24 volts AC. The circuit has 3 resistors, R1 = 100 ohms, R2 = 200 ohms and R3 = 100 ohms. The current in the circuit ____________. a. cannot be determined with AC voltage c. is higher in R1 and R3 than in R2b. b. is higher in R2 than in R1 or R d. is the same in R1, R2 and R3 - answerd. is the same in R1, R2 and R
  4. A three branch parallel circuit where each branch resistance is 90 ohms, what is the total resistance? a. 30 Ohms c. 270 Ohms b. 90 Ohms d. cannot be determined with the information provided - answera. 30 Ohms
  5. Smoke detectors shall not be installed in elevator hoistways unless _____________. a. the hoistway is sprinklered c. there is a heat detector also installed b. to activate smoke relief equipment d. a and b - answerd. a and b REF: (NFPA 72) 21.3.
  6. Which circuit pathway class designation does not include a redundant path? a. Class B c. Class C b. Class A d. Class X - answera. Class B REF: (NFPA 72) 12.3 (1)
  7. What color shall a grounded conductor 6 AWG or smaller be? a. Continuous white b. Continuous gray

c. Green d. A and B e. B and C - answerd. A and B REF: (NEC) 200.6(A)

  1. When required to be monitored and a building fire alarm system is installed, the activation of a open circuit on the fire suppression system shall annunciate a _______ signal at the FACU. a. trouble c. supervisory b. alarm d. b or c - answerc. supervisory REF: (NFPA 72) 23.8.5.11.1, 23.8.5.8. Supervisory: This fire alarm signal type is related to the supervision of certain field components. As an example the opening and the closing of the Sprinkler valve. Trouble: This fire alarm signal is typical of a device malfunctions.
  2. After fully charged batteries have been subject to a single discharge, the batteries shall be recharged within ______ hours. a. 12 c. 48 b. 24 d. 72 - answerc. 48 REF: (NFPA 72) 10.6.10.3.
  3. Identify the Class of the following hazardous location: a location with the presence of easilty ignitable fibers or materials producing combustible flyings are handled, manufactured, or used but are not likely to be suspended in air in sufficient quantities to ignite. a. Class I c. Class III b. Class II d. None of the above - answerc. Class III REF: (NEC) 500.5(D)
  4. If installing a combination audible/visible appliance, the location of the installed appliance shall be determined by _________. a. the location requirement of an audible notification appliance b. the location requirements of a visible notification appliance c. the location of audible notification appliances for wide area signaling d. None of the above - answerb. the location requirements of a visible notification appliance REF: (NFPA 72) 18.4.8.3 then 18.5.

b. AHJ d. Supervising Station - answerc. Qualified Installer REF: (NFPA 72) 7.5.6.

  1. Where heat detectors are used to shut down elevators power prior to sprinkler operation, the detector shall have both a_________ rating and a___________ sensitivity as compared to the sprinkler. a. lower temperature, higher sensitivity c. higher temperature, lower sensitivity b. higher temperature, higher sensitivity d. lower temperature, lower sensitivity - answera. lower temperature, higher sensitivity REF: (NFPA 72) 21.4.
  2. The proper method of testing a mechanical waterflow device of a wet-pipe system shall be performed by _________. a. setting off an existing sprinkler head and diverting the water to a holding container large enough to contain 200 gallons of water. b. flowing water through an inspector's test connection indicating the flow of water equal to that of a single sprinkler head d. None of the above - answerb. flowing water through an inspector's test connection indicating the flow of water equal to that of a single sprinkler head REF: (NFPA 72) 14.4.3.
  3. How should a voltmeter be connected in a DC circuit to read the voltage drop of a load? a. In series with the load c. In parallel with the load b. In parallel with the source d. In series with the source - answerc. In parallel with the load
  4. Manual fire alarm boxes (pull stations) shall be located within _________________ of the exit doorway opening at each exit on each floor. a. 5 feet c. 15 feet b. 10 feet d. 30 feet - answera. 5 feet REF: (NFPA 72) 17.14.8.
  5. What effective intensity would be needed when installing one visible appliance on a wall in a 54x54 foot room? a. 30cd c. 110 cd b. 94cd d. 177 cd - answerc. 110 cd REF: (NFPA 72) 18.5.5.4.1.A
  1. Equipment grounding conductors shall be _________. a. permitted to be bare c. insulated b. covered d. any of the above - answerd. any of the above REF: (NEC) 250.118(1)
  2. A supervisory valve switch shall be tested ___________. a. monthly c. semi-annually b. quarterly d. annually - answerc. semi-annually REF: (NFPA 72) 14.4.3.
  3. What cable types can be substituted for a FPLR cable? a. CMG, CM, FPL c. FPL b. CMP, FPL d. CMR, CMP, FPLP - answerd. CMR, CMP, FPLP REF: (NEC) 760.154(D)
  4. Spot type heat-sensing fire detectors shall be located on the vertical wall ______. a. 4 inches from the ceiling c. Within 4 inches to 12 inches from the ceiling b. 12 inches from the ceiling d. Within 6 inches and not more than 12 inches ceiling - answerc. Within 4 inches to 12 inches from the ceiling REF: (NFPA 72) 17.6.3.1.3.
  5. What type of signal will a valve tamper switch produce when actuated? a. Alarm c. Supervisory b. Trouble d. Fault - answerc. Supervisory REF: (NFPA 72) 23.8.5.8.1 & 17.16.
  6. Installation personnel shall have which qualification? a. Factory trained and certified for the system being installed b. Certified by a nationally recognized fire certification acceptable to the AHJ c. Registered, licensed, or certified by a state or local authority d. Any of the above - answerd. Any of the above REF: (NFPA 72) 10.5.2.
  7. When using a volt-ohm-meter (VOM) to measure voltage of a notification device, the meter leads should be ________. a. in series (in line) with the device

a. 12 inches b. 24 inches c. 36 inches d. 48 inches - answerc. 36 inches REF: (NFPA 72) 17.6.3.4.2.1 & 17.7.3.

  1. What is DARS? a. Digital Alarm Receiver System b. Digital Alarm Radio System c. Digital Alarm Receiver Shutdown d. Digital Alarm Radio Shutdown - answerb. Digital Alarm Radio System REF: (NFPA 72) 3.3.
  2. What is DART? a. Digital Alarm Radio Transmitter b. Digital Alarm Receiver Timer c. Digital Alarm Recovery Timer Digital Alarm d. Repeater Transmitter - answera. Digital Alarm Radio Transmitter REF: (NFPA 72) 3.3.
  3. What does SLC mean? a. Second Loop Circuit b. Signal Loop Communication c. Signaling Line Circuit d. Second Line Circuit - answerc. Signaling Line Circuit REF: (NFPA 72) 3.3.
  4. A common problem that is listed in Annex A with residential smoke detectors is: a. being removed for painting, but not reinstalled c. battery failure b. nuisance alarms from cooking d. none of these - answerb. nuisance alarms from cooking REF: (NFPA 72) A29.5.2.
  5. A system designed for a dwelling unit will have at least _________ independent source of operating power for a household fire alarm system. a. 1 c. 3 b. 2 d. 4 - answerb. 2 REF: (NFPA 72) 29.6.2 (1)
  6. Type NPLFP nonpower-limited fire alarm cable for use in other space used for environmental air shall be listed as having adequate _______ - _________ and low ________ - __________ characteristics. a. heat-resistant, flame-spreading

c. volt-rating, current-carrying b. fire-resistant, smoke-producing d. circuit-integrity, RF-inteference - answerb. fire-resistant, smoke-producing REF: (NEC) 760.176(C)

  1. Unless specifically designed and listed for the expected conditions, smoke detectors shall not be installed if any one of the following ambient conditions exist. a. Temperature below 32 degrees C c. Temperature above 100 degrees C b. Temperature below 32 degrees F d. Relative humidty below 93 percent - answerb. Temperature below 32 degrees F REF: (NFPA 72) 17.7.1.
  2. Remote-control circuits to safety-control equipment shall be ______ if the failure of the equipment to operate introduces a direct fire or life hazard. a. Class 1 c. Class 3 b. Class 2 d. Class 1 Division 1 - answera. Class 1 REF: (NEC) 725.31 (A)
  3. ßThe minimum size copper equipment grounding conductor required for a 40 A rated circuit is ______. a. # c. # b. # d. #10 - answerd. # REF: (NEC) 250.
  4. Found in Annex A, if audible appliances are installed in mechanical equipment rooms, the average sound level used for design guidance shall be at least _______ dBA for all occupancies. a. 85 c. 105 b. 100 d. 120 - answera. 85 REF: (NFPA 72) A18.4.3a. 85
  5. Audible notification appliances intended for operation in the public mode shall have a sound level at least______db above average ambient sound level or ______db above the maximum sound level.. a. 5, c. 10, b. 5, d. 15,5 - answerd. 15, REF: (NFPA 72) 18.4.3.