TFM 12 Fire Alarm Technical QUESTIONS AND ANSWERS RATE A +

Does a fire hood system and a kitchen need to be monitored by the fire alarm system? - CORRECT ANSWERS-Yes What does P.L.F.A stand for? - CORRECT ANSWERS-Power Limited Fire Alarm What does N.P.L.F.A stand for? - CORRECT ANSWERS-Non-Power Limited Fire Alarm What is the difference between P.F.L.A and N.P.F.L.A? - CORRECT ANSWERS-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 ANSWERS-ONLY solid stranded copper is permitted. What does A.W.G stand for? - CORRECT ANSWERS-American Wire Gauge What size conductors are permitted? - CORRECT ANSWERS-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? - CORRECT ANSWERS-An over-current device not rated over 20 amperes. When located within 7 feet 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 than ___ A.W.G? - CORRECT ANSWERS-18 Conductors of 28 A.W.G shall only be permitted in which circumstance? - CORRECT ANSWERS-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 ANSWERS-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 ANSWERS-Cable that can be installed in ducts, plenums, or other spaces used for environmental air. What is a Riser cable? - CORRECT ANSWERS-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 ANSWERS-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 ANSWERS-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 ANSWERS-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 ANSWERS-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? - CORRECT ANSWERS-150 volts What is the voltage rating marked on P.F.L.A cables? - CORRECT ANSWERS-Not less than 300 volts Shall the voltage rating marked on P.F.L.A cables? - CORRECT ANSWERS-No, because they may be mistakenly used for electrical applications. What is 'Rate Compensation Detector'? - CORRECT ANSWERS-A device that responds when a temperature rises at an exceeding rate that is predetermined. What is a 'Smoke Detector'? - CORRECT ANSWERS-a device that detects both visible and invisible combustion particles? Which detector is best a detecting invisible particles? - CORRECT ANSWERS-Ionization Which sensor is better at detecting thick, visible smoke particles? - CORRECT ANSWERS-Photoelectric What is a SPOT TYPE sensor? - CORRECT ANSWERS-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 ANSWERS-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 ANSWERS-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 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 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 from alarm signals. Does an exterior harm for a sprinkler system need to be supervised? - CORRECT ANSWERS-Yes What is a Cloud Chamber Smoke detection? - CORRECT ANSWERS-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? - CORRECT ANSWERS-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? - CORRECT ANSWERS-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 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-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 ANSWERS-Distinctive What code shall all wiring, cable and equipment be in accordance with? - CORRECT ANSWERS-NFPA 70, National Electric Code, Specifically articles 760, 770, and 800. All systems shall test free of _______, except for application in which _______ are approved. - CORRECT ANSWERS-grounds, grounds So long