Fire Alarm TFM12 questions and answers well illustrated.

Fire Alarm TFM12 questions and answers well illustrated. What does PLFA stand for? - correct answers.Power Limited Fire Alarm What does NPLFA stand for? - correct answers.Non Power Limited Fire Alarm What material must NPLFA circuit conductors be made from - correct answers.Only solid or stranded copper is permitted What is a single station detector? - correct answers.Battery powered smoke detectors that do not communicate off premises. What is a multiple station detector? - correct answers.Mains powered smoke detectors with battery backup that are linked together, so that if one unit initiates, alarms in all detectors will sound. They do not communicate off premises. How frequently must household single and multiple single station detectors be inspected and tested? - correct answers.In accordance with the manufactures recommendations, at least monthly. How frequently must household single and multiple station detectors be inspected and tested? - correct answers.At least 3 years, by a qualified service technician. How frequently must heat detectors be tested? - correct answers.Two or more annually, different detectors must be tested each year, and within 5 years all detectors must have been tested. What does "restorable" mean? - correct answers.The detector can be "restored" or "reused" after it has initiated. What does "non-restorable" mean? - correct answers.The detector cannot be 're-used" after it has initiated an alarm. (Think of a heat detector, which self destructs upon initiating.) What size conductors are permitted? - correct answers.Size 18 AWG and 16 AWG are permitted, provided they do not exceed certain rated ampacities What is used to protect transformers or other devices supplied from power-supply conductors? - correct answers.An overcurrent device not rated over 20 Amperes When located within 7ft of the floor, how shall cables be fastened? - correct answers.Cables shall be fastened in an approved manner at intervals of not more than 18 inches. Single conductors shall not be smaller that ___ AWG? - correct answers.18 Conductors of 26AWG shall only be permitted in which circumstances? - correct answers.Where spliced with a connector listed as suitable for 26 to 24 AWG. How should PLFA conductors NOT be installed? - correct answers.PLFA conductors shall not be strapped, taped or attached to the exterior of any conduit or raceway. What is Plenum cable? What are its characteristics? - correct answers.Cable that can be installed in ducts, plenums or other spaces used for environment air. It has adequate fire resistance and low smoke-producing characteristics. What is riser cable? What are its characteristics? - correct answers.Cable to be used in vertical wire runs in shafts or between floors. Not to be used where Plenum cable is required. It is capable of preventing fire from rising form floor-to-floor. What is Genral Purpose Cable? What are its characteristics? - correct answers.Cable for general purpose fire alarm use. Not to be used where Plenum or Riser cable is required. It is resistant to the spread of fire. What type shall plenum cable be? What substitutions are allowed? - correct answers.Power Limited Fire Alarm Plenum (FPLP) CMP can be substituted. What type shall riser wire be? What substitutions are permitted? - correct answers.Power Limited Fire Alarm Riser (FPLR) CMP,FPLP,CMR can be substituted. What type shall general purpose wire be? What substitutions are permitted? - correct answers.Power Limited Fire Alarm (FPL) CMP,FPLP,CMR,FPLR,CMG, and CM can be substituted. (All types) What is the maximum voltage permitted through multi-conductor NPLFA cables? - correct answers.150 volts What is the voltage rating of PLFA cables? - correct answers.Not less than 300 volts Shall the voltage be marked on PLFA cables? - correct answers.No, because they may be misinterpreted and used for electrical applications. What is a "Rate Compensation Detector"? - correct answers.A device that responds when the temperature reaches a pre-determined level. What is a "Rate of Rise Detector" - correct answers.A device that responds when the temperature rises at a rate exceeding a pre-determined value. What is a Smoke Detector? - correct answers.A device that detects both visible and invisible combustion particles. Which sensor is best at detecting invisible smoke particles? - correct answers.Ionization Which sensor is best at detecting thick, visible smoke particles? - correct answers.Photoelectric What is a Spot Type Detector? - correct answers.A device in which the detecting element is concentrated at particular location. What is a Digital Alarm Communicator Receiver? (DACR) - correct answers.a system component that accepts and displays signals sent over the public phone network from a DACT. (Le. ADT Monitoring center) What is a Digital Alarm Transmitter? (DACT) - correct answers.A system component at the protected premises is connected to the detection devices. It has line seizure and can connect to a DACR. (le. DSC Impassa) What is an Alarm Signal? - correct answers.A signal indicating an emergency that requires immediate action. What is a supervisory signal? - correct answers.A signal that indicates the need for action in connection with the SUPERVISION of the fire equipment. What is a trouble signal? - correct answers.A signal that indicates a FAULT with the fire equipment. It must have an audible signal, distinctive form alarm signals. Does an exterior horn for a sprinkler system need to be supervised? - correct answers.Yes Does a fire hood sprinkler system in a kitchen need to be monitored by the fire alarm system? - correct answers.Yes What is a cloud chamber smoke detection? - correct answers.A detector that draws an air sample into high-humidity, low pressure chamber. The condition in the chamber cause the moisture in the air to condense on the smoke particles, forming a cloud. The density of this cloud is measured by a photoelectric principle, if it meets a certain criteria, an alarm is generated. What is a ionization smoke detector? - correct answers.A detector that uses a small amount of radioactive material to ionize the air between two differently charge electrodes. When smoke is present between these electrodes, it causes the conductance of the air to decrease, and this causes the alarm to trip. What is a photoelectric light scattering smoke detection? - correct answers.A detector that uses light source and a photosensitive sensor, arranged so that light will only fall on the sensor when smoke particles are present. The particles reflect and retract light towards the sensor tripping the alarm. What is important about the way trouble signals sound? - correct answers.They must be distinctive from alarm signals. What three procedures must be in place before it is permitted to install a means to silence trouble/supervisory/alarm signals? - correct answers.1. The means shall be key operated and contained within the locked enclosure. 2. The means shall transfer its audible warning visual warning. 3. The audible trouble signal shall sound when the system is set to this silent mode and no trouble or supervisory exists. Fire/Supervisory signals shall be __ in sound from other signals and shall not be used for any other purpose. - correct answers.Distinctive What code shall all wiring, cable and equipment be in accordance with? - correct answers.NFPA 70 and the national electrical code. Specifically articles 760, 770 and 800 All systems shall test free of ___, except for applications which ___ are approved - correct answers.Grounds, Grounds So long as single open, ground or short circuit conditions do not affect the operation of equipment, what is not needed? - correct answers.Monitoring for integrity. Such conditions must not prevent alarm, trouble or supervisory signals being sent. If speakers are used to generate audible fire signals, what rule must apply? - correct answers.The speaker must be monitored for integrity. Any failure should result in a trouble signal. In one or two family dwelling, where must smoke detectors be located? - correct answers.All sleeping rooms, outside of each sleeping area and on all levels of the dwelling, (including basements) Where must spot type heat and smoke sensors be located on walls and ceilings? - correct answers.On the ceiling - not less than 4 in from the sidewalls and ceilings On the wall- between 4in and 12in from the ceiling. When more that one detector is used on a ceiling, what spacing measurement shall be used? - correct answers.All points shall have a detector equal to 0.7 (70%) times listed spacing Can detector be installed during construction? - correct answers.No, unless they are replaced after construction is complete. Why must a smoke detector not be placed above 250ft? (Smoke detector shall not be) - correct answers.Because of the effects of stratification, smoke will often not rise above this point. As the mounting location of smokes and heats get higher, the listed spacing must be reduced True or False? - correct answers.FALSE. The higher a heat is positioned, the smaller spacing. The higher a smoke us positioned, the wider the spacing Detectors and appliances shall be protected from damage by a mechanical guard as long as? - correct answers.It is listed for the purpose and does not interfere with the operation of the device. What is a water flow device? - correct answers.An attachment to the sprinkler system that can detect a predetermined rate of water flow, and is able to initiate the fire alarm.