TFM 12 Fire Alarm Technical Questions with correct Answers 2023

TFM 12 Fire Alarm Technical Questions with correct Answers 2023 Does a fire hood system and a kitchen need to be monitored by the fire alarm system? Yes What does P.L.F.A stand for? Power Limited Fire Alarm What does N.P.L.F.A stand for? Non-Power Limited Fire Alarm What is the difference between P.F.L.A and N.P.F.L.A? 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? ONLY solid stranded copper is permitted. What does A.W.G stand for? American Wire Gauge What size conductors are permitted? 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 power-supply conductors? An over-current device not rated over 20 amperes. When located within 7 feet 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 ___ A.W.G? 18 Conductors of 28 A.W.G shall only be permitted in which circumstance? Spliced with a connector listed as suitable for 26 to 24 A.W.G How shall P.F.L.A conductors NOT be installed? P.F.L.A conductors shall not be strapped, taped, or attached to the exterior of any conduit or raceway. What is Plenum cable? Cable that can be installed in ducts, plenums, or other spaces used for environmental air. What is a Riser cable? 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? 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? 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? 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? 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-conductor N.P.F.L.A cables? 150 volts What is the voltage rating marked on P.F.L.A cables? Not less than 300 volts Shall the voltage rating marked on P.F.L.A cables? No, because they may be mistakenly used for electrical applications. What is 'Rate Compensation Detector'? A device that responds when a temperature rises at an exceeding rate that is predetermined. What is a 'Smoke Detector'? a device that detects both visible and invisible combustion particles? Which detector is best a detecting invisible particles? Ionization Which sensor is better at detecting thick, visible smoke particles? Photoelectric What is a SPOT TYPE sensor? a device in which detecting an element is concentrated at a particular location. What is a DIGITAL ALARM COMMUNICATOR TRANSMITTER ( D.A.C.T)? 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)? 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? A signal indicating an emergency that requires immediate action. What is a Supervisory signal? A signal that indicates the need for action in connection with the SUPERVISION of fire equipment. What is a Trouble signal? 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? Yes What is a Cloud Chamber Smoke detection? 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 criteria, an alarm is generated. What is an Ionization Smoke detector? A detector that used a small amount of radio active 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? 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.