TFM 12 FIRE ALARM TECHNICAL EXAM WITH ACCURATE SOLUTIONS. VERIFIED 2025 EXAM UPDATE.

TFM 12 FIRE ALARM TECHNICAL EXAM WITH ACCURATE SOLUTIONS. VERIFIED 2025 EXAM UPDATE. Does a fire hood system and a kitchen need to be monitored by the fire alarm system? - CORRECT ANSWER: - Yes What does P.L.F.A stand for? - CORRECT ANSWER: - Power Limited Fire Alarm What does N.P.L.F.A stand for? - CORRECT ANSWER: - Non- CORRECT ANSWER: -Power Limited Fire Alarm What is the difference between P.F.L.A and N.P.F.L.A? - CORRECT ANSWER: - an N.P.L.F.A can operate at up to 600v, and the power output isn't limited a P.L.F.A has the voltage and power limited by a listed power source. What material must N.P.F.L.A circuit conductors be made from? - CORRECT ANSWER: - ONLY solid stranded copper is permitted. What does A.W.G stand for? - CORRECT ANSWER: - American Wire Gauge What size conductors are permitted? - CORRECT ANSWER: - Size 18 A.W.G and 16 A.W.G are permitted, provided they do not exceed certain capacities. What is used to protect transformers or other devices supplied from powersupply conductors? - CORRECT ANSWER: - An over-current device not rated over 20 amperes. When located within 7 feet of the floor, how shall cables be fastened? - CORRECT ANSWER: - Cables shall be fastened in an approved manner at intervals of not more than 18 inches. Single conductors shall not be smaller than A.W. G? - CORRECT ANSWER: - 18 Conductors of 28 A.W.G shall only be permitted in which circumstance? - CORRECT ANSWER: - Spliced with a connector listed as suitable for 26 to 24 A.W.G How shall P.F.L.A conductors NOT be installed? - CORRECT ANSWER: - P.F.L.A conductors shall not be strapped, taped, or attached to the exterior of any conduit or raceway. What is Plenum cable? - CORRECT ANSWER: - Cable that can be installed in ducts, plenums, or other spaces used for environmental air. What is a Riser cable? - CORRECT ANSWER: - Cable to be used in vertical wire runs in shafts between floors. Not to be used where Plenum cable is required. It is capable of preventing fire from rising from floor to floor. What is general purpose cable? - CORRECT ANSWER: - Cable for general purpose fire alarm use. Not to be used where plenum cable or riser cable is required. It is resistant to the spread of fire. Why 'type' shall plenum cable be? What substitutions are allowed? - CORRECT ANSWER: - Power Limited Fire Alarm Plenum (F.P.L.P) C.M.P can be substituted. Why 'type' shall riser cable be? What substitutions are allowed? - CORRECT ANSWER: - Power Limited Fire Alarm Riser (F.P.L.R) C.M.P, F.P.L.P. C.M.R can be substituted. What 'type' shall general purpose wire be? What substitutions are permitted? - CORRECT ANSWER: - Power Limited Fire Alarm (F.P.L) C.M.P, F.P.L.P, C.M.R, F.P.L.R, C.M.G CM can be substituted (all types) What is the maximum voltage permitted through multi- CORRECT ANSWER: -conductor N.P.F.L.A cables? - CORRECT ANSWER: - 150 volts What is the voltage rating marked on P.F.L.A cables? - CORRECT ANSWER: - Not less than 300 volts Shall the voltage rating mark on P.F.L.A cables? - CORRECT ANSWER: - No, because they may be mistakenly used for electrical applications. What is 'Rate Compensation Detector'? - CORRECT ANSWER: - A device that responds when a temperature rises at an exceeding rate that is predetermined. What is a 'Smoke Detector'? - CORRECT ANSWER: - a device that detects both visible and invisible combustion particles? Which detector is best a detecting invisible particle? - CORRECT ANSWER: - Ionization Which sensor is better at detecting thick, visible smoke particles? - CORRECT ANSWER: - Photoelectric What is a SPOT TYPE sensor? - CORRECT ANSWER: - a device in which detecting an element is concentrated at a particular location. What is a DIGITAL ALARM COMMUNICATOR TRANSMITTER (D.A.C.T)? - CORRECT ANSWER: - A system component at the protected premises is connected to the detection devices. It has a line seizure and can connect to a D.A.C.R. What is a DIGITAL ALARM COMMUNICATOR RECEIVER? (D.A.C.R)? - CORRECT ANSWER: - A system component that accepts and displays signals sent over the public phone network from a D.A.C.T (i.e. A.D. T monitoring center) What is an alarm signal? - CORRECT ANSWER: - A signal indicating an emergency that requires immediate action. What is a Supervisory signal? - CORRECT ANSWER: - A signal that indicates the need for action in connection with the SUPERVISION of fire equipment. What is a Trouble signal? - CORRECT ANSWER: - A signal that indicates a fault with the fire equipment. It must have an audible signal, distinctive from alarm signals. Does an exterior harm for a sprinkler system need to be supervised? - CORRECT ANSWER: - Yes What is a Cloud Chamber Smoke detection? - CORRECT ANSWER: - A detector draws an air sample into a high humidity, low pressure chamber. The conditions 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 criterion, an alarm is generated. What is an Ionization Smoke detector? - CORRECT ANSWER: - A detector that used a small amount of radioactive material to ionize the air between two differently charged 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 Photo Electric Light Scattering Smoke Detection? - CORRECT ANSWER: - 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? - CORRECT ANSWER: - 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 ANSWER: - The means shall be key operated and contained within a locked enclosure The means shall transfer it's audible warning to a visual warning. The audible trouble signal shall sound when the system is set to 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 ANSWER: - Distinctive What code shall all wiring, cable and equipment be in accordance with? - CORRECT ANSWER: - NFPA 70, National Electric Code, Specifically articles 760, 770, and 800.