BM-TEST-NICET Fire Alarm Level IV Practice Exam

Consider a ceiling which 14 feet AFF, and is level with beams for smoke detection purposes. The beams are 15 inches deep and spaced at 64 inches on center. Based on this, an adjustment of _____ is required?

The design drawings show a room which is 100 feet x 150 feet with a ceiling height of 18 feet. The ceiling is smooth and level. Based on this, a total of _____ spot type smoke detectors are needed to cover this space?

Consider an area which has 8.6 air changes per hour. Based on this, spot type smoke detector spacing is _____ feet?

Consider a horn which produces 87 dBA at 10 feet. Based on this, the horn will produce _____ dBA at 80 feet?

Consider a ceiling which 16 feet AFF, and is level with beams for smoke detection purposes. The beams are 20 inches deep and spaced at 64 inches on center. Based on this, an adjustment of _____ is required?

Consider a corridor which is 10 feet wide with a smooth and level ceiling. The maximum spacing between spot type smoke detectors is _____ feet?

Consider an area which has 10 air changes per hour. Based on this, spot type smoke detector spacing is _____ feet?

Consider a ceiling which 14 feet AFF, and is level with beams for smoke detection purposes. The beams are 17 inches deep and spaced at 64 inches on center. Based on this, an adjustment of _____ is required?

Consider a room with a smooth and level ceiling which is 15 feet AFF. Heat detectors with a listed spacing of 50 feet are used to provide automatic detection. Based on this, the maximum distance from the sidewall to the first row of ceiling mounted detectors is _____ feet?

Consider a corridor which is 15 feet wide with a smooth and level ceiling. The maximum spacing between spot type smoke detectors is _____ feet?

Consider an area which has 20 air changes per hour. Based on this, spot type smoke detector spacing is _____ feet?

Consider a ceiling which 16 feet AFF, and is level with beams for smoke detection purposes. The beams are 17 inches deep and spaced at 64 inches on center. Based on this, an adjustment of _____ is required?

Consider a room with a smooth and level ceiling which is 10 feet AFF. Heat detectors with a listed spacing of 50 feet are used to provide automatic detection. Based on this, the maximum distance from the sidewall to the first row of ceiling mounted detectors is _____ feet?

Consider a corridor which is 20 feet wide with a smooth and level ceiling. The maximum spacing between spot type smoke detectors is _____ feet?

Consider an area which has 30 air changes per hour. Based on this, spot type smoke detector spacing is _____ feet?

Consider a ceiling which 14 feet AFF, and is level with beams for smoke detection purposes. The beams are 15 inches deep and spaced at 64 inches on center. Based on this, an adjustment of _____ is required?

Consider a room with a smooth and level ceiling which is 18 feet AFF. Heat detectors with a listed spacing of 50 feet are used to provide automatic detection. Based on this, the maximum distance from the sidewall to the first row of ceiling mounted detectors is _____ feet?

Consider a corridor which is 25 feet wide with a smooth and level ceiling. The maximum spacing between spot type smoke detectors is _____ feet?

Consider an area which has 60 air changes per hour. Based on this, spot type smoke detector spacing is _____ feet?

Consider a ceiling which 16 feet AFF, and is level with beams for smoke detection purposes. The beams are 20 inches deep and spaced at 64 inches on center. Based on this, an adjustment of _____ is required?

Consider a room with a smooth and level ceiling which is 20 feet AFF. Heat detectors with a listed spacing of 50 feet are used to provide automatic detection. Based on this, the maximum distance from the sidewall to the first row of ceiling mounted detectors is _____ feet?

Consider the installation of an air sampling type smoke detection system. In this specific application, maximum air sampling transport time is 1 second per foot. Based on this, the farthest sampling port to the detector shall not exceed _____ feet?

Consider a 120 feet x 150 feet room which has a ceiling surface with beams which are 15 inches deep and spaced at 4 feet apart. The ceiling is 14 feet AFF and level. The beams run the length of the room. Based on this a total of _____ detectors are required?

Consider a horn which produces 84 dBA at 10 feet. Based on this, the horn will produce _____ dBA at 20 feet?

Consider a 24 VDC fire alarm notification appliance circuit with 14 AWG solid coated copper conductor (approximately 3 ohms per 1K ft). The current is 4 amps in alarm. The notification appliances require a minimum of 20.4 volts to operate properly. Based on this, the maximum acceptable total length of conductors is _____ feet?

Consider the installation of an air sampling type smoke detection system. In this specific application, maximum air sampling transport time is 2 seconds per foot. Based on this, the farthest sampling port to the detector shall not exceed _____ feet?

Consider a 120 feet x 150 feet room which has a ceiling surface with beams which are 24 inches deep and spaced at 4 feet apart. The ceiling is 14 feet AFF and level. The beams run the length of the room. Based on this a total of _____ detectors are required?

Consider a horn which produces 84 dBA at 10 feet. Based on this, the horn will produce _____ dBA at 40 feet?

Consider a 24 VDC fire alarm notification appliance circuit with 16 AWG solid coated copper conductor (approximately 5 ohms per 1K ft). The current is 4 amps in alarm. The notification appliances require a minimum of 20.4 volts to operate properly. Based on this, the maximum acceptable total length of conductors is _____ feet?

Consider the installation of an air sampling type smoke detection system. In this specific application, maximum air sampling transport time is 4 seconds per foot. Based on this, the farthest sampling port to the detector shall not exceed _____ feet?

Consider a 120 feet x 150 feet room which has a ceiling surface with beams which are 24 inches deep and spaced at 4 feet apart. The ceiling is 14 feet AFF and level. The beams run the length of the room. Projected beam smoke detectors with a listed spacing of 60’ x 300’ are used. Based on this a total of _____ projected beam smoke detectors are required?

Consider a room with a smooth and level ceiling which is 15 feet AFF. Heat detectors with a listed spacing of 50 feet are used to provide automatic detection. Based on this, the maximum distance from the sidewall to the first row of ceiling mounted detectors is _____ feet?

Consider a horn which produces 84 dBA at 10 feet. Based on this, the horn will produce _____ dBA at 20 feet?

Consider a 24 VDC fire alarm notification appliance circuit with 18 AWG solid coated copper conductor (approximately 8 ohms per 1K ft). The current is 4 amps in alarm. The notification appliances require a minimum of 20.4 volts to operate properly. Based on this, the maximum acceptable total length of conductors is _____ feet?

Consider speakers tapped at 1/8 watt and produce a sound level of 82 dBA at 10 feet. In order to produce a sound level of 70 dBA at 40 feet, the speakers should be tapped at _____ watt?

Consider a 120 feet x 150 feet room which has a ceiling surface with beams which are 24 inches deep and spaced at 10 feet apart. The ceiling is 14 feet AFF and level. The beams run the length of the room. Based on this a total of _____ detectors are required?

Consider a room with a smooth and level ceiling which is 10 feet AFF. Heat detectors with a listed spacing of 50 feet are used to provide automatic detection. Based on this, the maximum distance from the sidewall to the first row of ceiling mounted detectors is _____ feet?

Consider a horn which produces 84 dBA at 10 feet. Based on this, the horn will produce _____ dBA at 40 feet?

Consider a fire alarm notification circuit which has 800 feet total of solid coated copper conductors. The circuit is 24 VDC, and the current is 2 amps in alarm. The circuit is required to deliver 20.4 volts. Based on this, the appropriate wire size is _____ AWG? (Assume 1K ft of conductor: 18 AWG = 8 ohms, 16 AWG = 5 ohms, 14 AWG = 3 ohms, 12 AWG = 2 ohms)

Consider speakers tapped at 1/8 watt and produce a sound level of 82 dBA at 10 feet. In order to produce a sound level of 73 dBA at 40 feet, the speakers should be tapped at _____ watt?

Consider a 120 feet x 150 feet room which has a ceiling surface with beams which are 24 inches deep and spaced at 10 feet apart. The ceiling is 14 feet AFF and level. The beams run the length of the room. Based on this a total of _____ photobeam smoke detectors are required?

Consider a horn which produces 84 dBA at 10 feet. Based on this, the horn will produce _____ dBA at 80 feet?

Consider a horn which produces 84 dBA at 10 feet. Based on this, the horn will produce _____ dBA at 80 feet?

Consider a fire alarm notification circuit which has 800 feet total of solid coated copper conductors. The circuit is 24 VDC, and the current is 1 amps in alarm. The circuit is required to deliver 20.4 volts. Based on this, the appropriate wire size is _____ AWG? (Assume 1K ft of conductor: 18 AWG = 8 ohms, 16 AWG = 5 ohms, 14 AWG = 3 ohms, 12 AWG = 2 ohms)

Consider speakers tapped at 1/8 watt and produce a sound level of 82 dBA at 10 feet. In order to produce a sound level of 76 dBA at 40 feet, the speakers should be tapped at _____ watt?

Consider a room which is 50 feet wide and 95 feet in length. The ceiling is 10 feet AFF and smooth and level. The space has 30 air changes per hour. Based on this a total of _____ spot type smoke detectors are required?

Consider a room with a smooth and level ceiling which is 18 feet AFF. Heat detectors with a listed spacing of 50 feet are used to provide automatic detection. Based on this, the maximum distance from the sidewall to the first row of ceiling mounted detectors is _____ feet?

Consider a horn which produces 87 dBA at 10 feet. Based on this, the horn will produce _____ dBA at 20 feet?

Consider a fire alarm notification circuit which has 500 feet total of solid coated copper conductors. The circuit is 24 VDC, and the current is 1 amps in alarm. The circuit is required to deliver 20.4 volts. Based on this, the appropriate wire size is _____ AWG? (Assume 1K ft of conductor: 18 AWG = 8 ohms, 16 AWG = 5 ohms, 14 AWG = 3 ohms, 12 AWG = 2 ohms)

Consider speakers tapped at 1/8 watt and produce a sound level of 82 dBA at 10 feet. In order to produce a sound level of 79 dBA at 40 feet, the speakers should be tapped at _____ watt?

Consider a horn which produces 84 dBA at 10 feet. Based on this, the horn will produce _____ dBA at 20 feet?

Consider a horn which produces 87 dBA at 10 feet. Based on this, the horn will produce _____ dBA at 20 feet?

Consider a horn which produces 87 dBA at 10 feet. Based on this, the horn will produce _____ dBA at 40 feet?

Consider a fire alarm notification circuit which has 250 feet total of solid coated copper conductors. The circuit is 24 VDC, and the current is 1 amps in alarm. The circuit is required to deliver 20.4 volts. Based on this, the appropriate wire size is _____ AWG? (Assume 1K ft of conductor: 18 AWG = 8 ohms, 16 AWG = 5 ohms, 14 AWG = 3 ohms, 12 AWG = 2 ohms)

Consider speakers tapped at 1/8 watt and produce a sound level of 82 dBA at 10 feet. In order to produce a sound level of 70 dBA at 80 feet, the speakers should be tapped at _____ watt?

Consider a horn which produces 84 dBA at 10 feet. Based on this, the horn will produce _____ dBA at 40 feet?

Consider a horn which produces 87 dBA at 10 feet. Based on this, the horn will produce _____ dBA at 80 feet?

The design drawings show a room which is 100 feet x 150 feet with a ceiling height of 15 feet. The ceiling is smooth and level. Based on this, a total of _____ spot type smoke detectors are needed to cover this space?

Consider an area which has 12 air changes per hour. Based on this, spot type smoke detector spacing is _____ feet?

Consider a horn which produces 84 dBA at 10 feet. Based on this, the horn will produce _____ dBA at 80 feet?

Consider a ceiling which 14 feet AFF, and is level with beams for smoke detection purposes. The beams are 17 inches deep and spaced at 64 inches on center. Based on this, an adjustment of _____ is required?

The design drawings show a room which is 100 feet x 150 feet with a ceiling height of 10 feet. The ceiling is smooth and level. Based on this, a total of _____ spot type smoke detectors are needed to cover this space?

Consider an area which has 7.5 air changes per hour. Based on this, spot type smoke detector spacing is _____ feet?

Consider a horn which produces 87 dBA at 10 feet. Based on this, the horn will produce _____ dBA at 20 feet?

Consider a ceiling which 16 feet AFF, and is level with beams for smoke detection purposes. The beams are 17 inches deep and spaced at 64 inches on center. Based on this, an adjustment of _____ is required?

The design drawings show a room which is 100 feet x 150 feet with a ceiling height of 12 feet. The ceiling is smooth and level. Based on this, a total of _____ spot type smoke detectors are needed to cover this space?

Consider an area which has 15 air changes per hour. Based on this, spot type smoke detector spacing is _____ feet?

Consider a horn which produces 87 dBA at 10 feet. Based on this, the horn will produce _____ dBA at 40 feet?

Consider a 24 VDC fire alarm notification appliance circuit with 14 AWG solid coated copper conductor (approximately 3 ohms per 1K ft). The current is 4 amps in alarm. The notification appliances require a minimum of 20.4 volts to operate properly. Based on this, the maximum acceptable total length of conductors is _____ feet?

Consider a 24 VDC fire alarm notification appliance circuit with 16 AWG solid coated copper conductor (approximately 5 ohms per 1K ft). The current is 4 amps in alarm. The notification appliances require a minimum of 20.4 volts to operate properly. Based on this, the maximum acceptable total length of conductors is _____ feet?

Consider a ceiling which 14 feet AFF, and is level with beams for smoke detection purposes. The beams are 17 inches deep and spaced at 64 inches on center. Based on this, an adjustment of _____ is required?

Consider a 24 VDC fire alarm notification appliance circuit with 18 AWG solid coated copper conductor (approximately 8 ohms per 1K ft). The current is 4 amps in alarm. The notification appliances require a minimum of 20.4 volts to operate properly. Based on this, the maximum acceptable total length of conductors is _____ feet?

Consider a ceiling which 16 feet AFF, and is level with beams for smoke detection purposes. The beams are 17 inches deep and spaced at 64 inches on center. Based on this, an adjustment of _____ is required?

Consider a fire alarm notification circuit which has 800 feet total of solid coated copper conductors. The circuit is 24 VDC, and the current is 2 amps in alarm. The circuit is required to deliver 20.4 volts. Based on this, the appropriate wire size is _____ AWG? (Assume 1K ft of conductor: 18 AWG = 8 ohms, 16 AWG = 5 ohms, 14 AWG = 3 ohms, 12 AWG = 2 ohms)

Consider a ceiling which 14 feet AFF, and is level with beams for smoke detection purposes. The beams are 15 inches deep and spaced at 64 inches on center. Based on this, an adjustment of _____ is required?

Consider a fire alarm notification circuit which has 800 feet total of solid coated copper conductors. The circuit is 24 VDC, and the current is 1 amps in alarm. The circuit is required to deliver 20.4 volts. Based on this, the appropriate wire size is _____ AWG? (Assume 1K ft of conductor: 18 AWG = 8 ohms, 16 AWG = 5 ohms, 14 AWG = 3 ohms, 12 AWG = 2 ohms)

Consider a ceiling which 16 feet AFF, and is level with beams for smoke detection purposes. The beams are 20 inches deep and spaced at 64 inches on center. Based on this, an adjustment of _____ is required?

Consider a fire alarm notification circuit which has 500 feet total of solid coated copper conductors. The circuit is 24 VDC, and the current is 1 amps in alarm. The circuit is required to deliver 20.4 volts. Based on this, the appropriate wire size is _____ AWG? (Assume 1K ft of conductor: 18 AWG = 8 ohms, 16 AWG = 5 ohms, 14 AWG = 3 ohms, 12 AWG = 2 ohms)

Consider a room with a smooth and level ceiling which is 15 feet AFF. Heat detectors with a listed spacing of 50 feet are used to provide automatic detection. Based on this, the maximum distance from the sidewall to the first row of ceiling mounted detectors is _____ feet?

Consider a horn which produces 87 dBA at 10 feet. Based on this, the horn will produce _____ dBA at 40 feet?

Consider a room with a smooth and level ceiling which is 20 feet AFF. Heat detectors with a listed spacing of 50 feet are used to provide automatic detection. Based on this, the maximum distance from the sidewall to the first row of ceiling mounted detectors is _____ feet?

Consider a horn which produces 87 dBA at 10 feet. Based on this, the horn will produce _____ dBA at 80 feet?

Consider a room with a smooth and level ceiling which is 20 feet AFF. Heat detectors with a listed spacing of 50 feet are used to provide automatic detection. Based on this, the maximum distance from the sidewall to the first row of ceiling mounted detectors is _____ feet?

The design drawings show a room which is 100 feet x 150 feet with a ceiling height of 15 feet. The ceiling is smooth and level. Based on this, a total of _____ spot type smoke detectors are needed to cover this space?

Consider the installation of an air sampling type smoke detection system. In this specific application, maximum air sampling transport time is 1 second per foot. Based on this, the farthest sampling port to the detector shall not exceed _____ feet?

The design drawings show a room which is 100 feet x 150 feet with a ceiling height of 12 feet. The ceiling is smooth and level. Based on this, a total of _____ spot type smoke detectors are needed to cover this space?

Consider the installation of an air sampling type smoke detection system. In this specific application, maximum air sampling transport time is 4 seconds per foot. Based on this, the farthest sampling port to the detector shall not exceed _____ feet?

Consider an area which has 15 air changes per hour. Based on this, spot type smoke detector spacing is _____ feet?

Consider a 24 VDC fire alarm notification appliance circuit with 14 AWG solid coated copper conductor (approximately 3 ohms per 1K ft). The current is 4 amps in alarm. The notification appliances require a minimum of 20.4 volts to operate properly. Based on this, the maximum acceptable total length of conductors is _____ feet?

The design drawings show a room which is 100 feet x 150 feet with a ceiling height of 10 feet. The ceiling is smooth and level. Based on this, a total of _____ spot type smoke detectors are needed to cover this space?

Consider the installation of an air sampling type smoke detection system. In this specific application, maximum air sampling transport time is 2 seconds per foot. Based on this, the farthest sampling port to the detector shall not exceed _____ feet?

The design drawings show a room which is 100 feet x 150 feet with a ceiling height of 18 feet. The ceiling is smooth and level. Based on this, a total of _____ spot type smoke detectors are needed to cover this space?

The design drawings show a room which is 100 feet x 150 feet with a ceiling height of 12 feet. The ceiling is smooth and level. Based on this, a total of _____ spot type smoke detectors are needed to cover this space?

Consider an area which has 8.6 air changes per hour. Based on this, spot type smoke detector spacing is _____ feet?

Consider a 24 VDC fire alarm notification appliance circuit with 16 AWG solid coated copper conductor (approximately 5 ohms per 1K ft). The current is 4 amps in alarm. The notification appliances require a minimum of 20.4 volts to operate properly. Based on this, the maximum acceptable total length of conductors is _____ feet?

Consider speakers tapped at 1/8 watt and produce a sound level of 82 dBA at 10 feet. In order to produce a sound level of 70 dBA at 40 feet, the speakers should be tapped at _____ watt?

Consider the installation of an air sampling type smoke detection system. In this specific application, maximum air sampling transport time is 4 seconds per foot. Based on this, the farthest sampling port to the detector shall not exceed _____ feet?

Consider a corridor which is 10 feet wide with a smooth and level ceiling. The maximum spacing between spot type smoke detectors is _____ feet?

The design drawings show a room which is 100 feet x 150 feet with a ceiling height of 18 feet. The ceiling is smooth and level. Based on this, a total of _____ spot type smoke detectors are needed to cover this space?

Consider a 24 VDC fire alarm notification appliance circuit with 18 AWG solid coated copper conductor (approximately 8 ohms per 1K ft). The current is 4 amps in alarm. The notification appliances require a minimum of 20.4 volts to operate properly. Based on this, the maximum acceptable total length of conductors is _____ feet?

Consider speakers tapped at 1/8 watt and produce a sound level of 82 dBA at 10 feet. In order to produce a sound level of 73 dBA at 40 feet, the speakers should be tapped at _____ watt?

Consider a corridor which is 15 feet wide with a smooth and level ceiling. The maximum spacing between spot type smoke detectors is _____ feet?

Consider speakers tapped at 1/8 watt and produce a sound level of 82 dBA at 10 feet. In order to produce a sound level of 76 dBA at 40 feet, the speakers should be tapped at _____ watt?

Consider a fire alarm notification circuit which has 800 feet total of solid coated copper conductors. The circuit is 24 VDC, and the current is 2 amps in alarm. The circuit is required to deliver 20.4 volts. Based on this, the appropriate wire size is _____ AWG? (Assume 1K ft of conductor: 18 AWG = 8 ohms, 16 AWG = 5 ohms, 14 AWG = 3 ohms, 12 AWG = 2 ohms)

Consider a corridor which is 10 feet wide with a smooth and level ceiling. The maximum spacing between spot type smoke detectors is _____ feet?

Consider a corridor which is 20 feet wide with a smooth and level ceiling. The maximum spacing between spot type smoke detectors is _____ feet?

Consider a corridor which is 15 feet wide with a smooth and level ceiling. The maximum spacing between spot type smoke detectors is _____ feet?

Consider a fire alarm notification circuit which has 800 feet total of solid coated copper conductors. The circuit is 24 VDC, and the current is 1 amps in alarm. The circuit is required to deliver 20.4 volts. Based on this, the appropriate wire size is _____ AWG? (Assume 1K ft of conductor: 18 AWG = 8 ohms, 16 AWG = 5 ohms, 14 AWG = 3 ohms, 12 AWG = 2 ohms)

Consider speakers tapped at 1/8 watt and produce a sound level of 82 dBA at 10 feet. In order to produce a sound level of 79 dBA at 40 feet, the speakers should be tapped at _____ watt?

Consider a fire alarm notification circuit which has 250 feet total of solid coated copper conductors. The circuit is 24 VDC, and the current is 1 amps in alarm. The circuit is required to deliver 20.4 volts. Based on this, the appropriate wire size is _____ AWG? (Assume 1K ft of conductor: 18 AWG = 8 ohms, 16 AWG = 5 ohms, 14 AWG = 3 ohms, 12 AWG = 2 ohms)

Consider a corridor which is 25 feet wide with a smooth and level ceiling. The maximum spacing between spot type smoke detectors is _____ feet?

Consider speakers tapped at 1/8 watt and produce a sound level of 82 dBA at 10 feet. In order to produce a sound level of 70 dBA at 80 feet, the speakers should be tapped at _____ watt?

Consider a room with a smooth and level ceiling which is 10 feet AFF. Heat detectors with a listed spacing of 50 feet are used to provide automatic detection. Based on this, the maximum distance from the sidewall to the first row of ceiling mounted detectors is _____ feet?

Consider a fire alarm notification circuit which has 500 feet total of solid coated copper conductors. The circuit is 24 VDC, and the current is 1 amps in alarm. The circuit is required to deliver 20.4 volts. Based on this, the appropriate wire size is _____ AWG? (Assume 1K ft of conductor: 18 AWG = 8 ohms, 16 AWG = 5 ohms, 14 AWG = 3 ohms, 12 AWG = 2 ohms)

Consider a corridor which is 20 feet wide with a smooth and level ceiling. The maximum spacing between spot type smoke detectors is _____ feet?

The design drawings show a room which is 100 feet x 150 feet with a ceiling height of 15 feet. The ceiling is smooth and level. Based on this, a total of _____ spot type smoke detectors are needed to cover this space?

Consider the installation of an air sampling type smoke detection system. In this specific application, maximum air sampling transport time is 1 second per foot. Based on this, the farthest sampling port to the detector shall not exceed _____ feet?

Consider an area which has 12 air changes per hour. Based on this, spot type smoke detector spacing is _____ feet?

Consider a room with a smooth and level ceiling which is 18 feet AFF. Heat detectors with a listed spacing of 50 feet are used to provide automatic detection. Based on this, the maximum distance from the sidewall to the first row of ceiling mounted detectors is _____ feet?

Consider a fire alarm notification circuit which has 250 feet total of solid coated copper conductors. The circuit is 24 VDC, and the current is 1 amps in alarm. The circuit is required to deliver 20.4 volts. Based on this, the appropriate wire size is _____ AWG? (Assume 1K ft of conductor: 18 AWG = 8 ohms, 16 AWG = 5 ohms, 14 AWG = 3 ohms, 12 AWG = 2 ohms)

Consider a corridor which is 25 feet wide with a smooth and level ceiling. The maximum spacing between spot type smoke detectors is _____ feet?

The design drawings show a room which is 100 feet x 150 feet with a ceiling height of 10 feet. The ceiling is smooth and level. Based on this, a total of _____ spot type smoke detectors are needed to cover this space?

Consider the installation of an air sampling type smoke detection system. In this specific application, maximum air sampling transport time is 2 seconds per foot. Based on this, the farthest sampling port to the detector shall not exceed _____ feet?

Consider an area which has 7.5 air changes per hour. Based on this, spot type smoke detector spacing is _____ feet?

Consider speakers tapped at 1/8 watt and produce a sound level of 82 dBA at 10 feet. In order to produce a sound level of 70 dBA at 40 feet, the speakers should be tapped at _____ watt?

Consider speakers tapped at 1/8 watt and produce a sound level of 82 dBA at 10 feet. In order to produce a sound level of 73 dBA at 40 feet, the speakers should be tapped at _____ watt?

Consider speakers tapped at 1/8 watt and produce a sound level of 82 dBA at 10 feet. In order to produce a sound level of 76 dBA at 40 feet, the speakers should be tapped at _____ watt?

Consider speakers tapped at 1/8 watt and produce a sound level of 82 dBA at 10 feet. In order to produce a sound level of 79 dBA at 40 feet, the speakers should be tapped at _____ watt?

Consider speakers tapped at 1/8 watt and produce a sound level of 82 dBA at 10 feet. In order to produce a sound level of 70 dBA at 80 feet, the speakers should be tapped at _____ watt?

Consider an area which has 12 air changes per hour. Based on this, spot type smoke detector spacing is _____ feet?

Consider an area which has 7.5 air changes per hour. Based on this, spot type smoke detector spacing is _____ feet?

Consider an area which has 15 air changes per hour. Based on this, spot type smoke detector spacing is _____ feet?

Consider an area which has 8.6 air changes per hour. Based on this, spot type smoke detector spacing is _____ feet?