TFM12 QUESTIONS WITH SOLUTIONS 2023

TFM12 QUESTIONS WITH SOLUTIONS 2023 What is used to protect transformers or other devices supplied from power-supply conductors? A. An overcurrent device not rated over 20 Amperes. What does PLFA stand for? Power Limited Fire Alarm What does NPLFA stand for? Non-Power Limited Fire Alarm What material must NPLFA circuit conductors be made from? Solid or stranded copper What is a single station detector? Battery powered smoke alarms that do not communicate off premises. What is a multiple station detector? Smoke alarms with battery backup that are linked together, so that if one unit initiates, all detectors will sound. They do not communicate off premises. How frequently must household single and multiple station detectors be inspected and tested? In accordance with the manufacturers recommendations, at least monthly How frequently must household fire alarm systems be inspected and tested? At least every year, by a qualified service technician. What does 'restorable' mean? The device can be 'restored' or 'reused' after it has initiated an alarm. What size conductors are permitted? A. Size 18AWG and 16AWG When located within 7ft of the floor, how shall cables be fastened? Cables shall be fastened in an approved manner at intervals of not more than 18 inches. Single conductors shall not be smaller than (X) AWG 18 Conductors of 26AWG shall only be permitted in which circumstances? A. Where spliced with a connector listed as suitable for 26 to 24 AWG What is a Plenum cable? Cable that can be installed in ducts and other spaces used for environmental air. What is Riser cable? Cable to be used in vertical wire runs in shafts or between floors. What is General Purpose cable? A. Cable for general purpose fire alarm use What 'type' shall plenum cable be? FPLP What substitutions are allowed for the above? CMP What 'type' shall riser wire be? FPLR What substitutions are permitted for the above? FPLP What 'type' shall general purpose wire be? FPL What substitutions are permitted for the above? CM What is the maximum voltage permitted through NPLFA cables? 600 volts What is the maximum voltage permitted through multi-conductor NPLFA cables? 150 volts What is the voltage rating of PLFA cables? Not less than 300 volts Shall the voltage be marked on PLFA cables? No What is a 'Rate Compensation Detector'? A device that responds when the temperature reaches a pre-determined level. What is a 'Rate of Rise Detector'? A device that responds when the temperature rises at a rate exceeding a pre-determined value Which sensor is best at detecting 'invisible' smoke particles? Ionization Which sensor is best at detecting thick, 'visible' smoke particles? Photoelectric What is a 'Spot Type Detector'? A device in which the detecting element is concentrated at a particular location. What is a 'Digital DACR? Digital Alarm Communicator Receiver Name a DACT. Impassa What is an Alarm Signal? A signal indicating an emergency that requires IMMEDIATE action Does an exterior horn for a sprinkler system need to be supervised? Yes Does a fire hood sprinkler system in a kitchen need to be monitored by the fire alarm system? Yes What is 'Photoelectric Light-Scattering Smoke Detection'? A detector that uses a 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? They must be distinctive from alarm signals Fire/ Supervisory signals shall be (x) in sound from other signals and shall not be used for any other purpose. Distinctive What code shall all wiring, cable and equipment be in accordance with? NFPA 70 All systems shall test free of , except for applications in which are approved. Grounds So long as single open, ground or short circuit conditions do not affect the operation of equipment, what is not needed? 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? Any failure should result in a trouble signal. In a one or two family dwelling, where must smoke detectors be located? 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? Between 4in and 12in from the ceiling When more than one detector is used on a ceiling, what spacing measurement shall be used? All points shall have a detector equal to 0.7 times the listed spacing. Can a detector be installed during construction? Only if they are replaced upon completion of construction As the mounting location of smokes and heats gets higher, the listed spacing must be reduced. T/F? True