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69 Cards in this Set
- Front
- Back
the subassemblies of alarm, safety, and warning systems
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audible and visual devices, sensing devices, alarm switchboard and panels |
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what are the internal circuit on alarm, safety, and warning systems are for
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defines if the system needs to give an audible or visible signal |
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3 alarm conditions
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normal, alarm, trouble |
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current flow in alarm condition |
increase of current |
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current flow in normal condition
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small continuous flow
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current flow in trouble condition
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not able to complete circuit |
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name of the resistor that is installed parallel to the alarm contacts and is placed at the end of the circuit |
supervisory |
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number of ohms is the supervisory resistor |
7000
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what alerts personnel to an alarm condition
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audio and visual devices |
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where are buzzers used |
relatively quiet places |
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what is the IC/Z1S4 |
buzzers ac operated and have no contacts |
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what horns use to produce a sound |
diaphrams |
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2 devices can be both ac or dc operated |
bells and buzzers |
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where sirens are used |
very noisy spaces |
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what are audible signals supplemented by in noisy spaces |
visual signals |
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why there are two lamps in parallel used with watertight lamp indicators |
in case one burns out |
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what are the 2 types of sensing devices |
detectors and switches |
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what are detectors used to sense |
gas or smoke |
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where is the detector head installed of the ionization detector |
overhead of compartment |
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what are the 2 conditions/settings of a switch |
normal and abnormal |
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what are the seven switches |
Liquid level float, manual, mechanical, pressure, water, thermostatic, mercury thermostatic |
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what is an IC/SM |
alarm switchboard |
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a reed switch is what type of switch |
magnetically activated switch |
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how does a liquid level float switch operate |
water rises in the switch causeing the float to rise and connect the circuit |
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which switch is the only single pole double throw switch |
sensitive switch |
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what are sensitive switches referred to as |
microswitches |
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what IC/DM switch equipment controls the roller armature |
striker plate |
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what should you isolate the supervisory alarm from when T/S a door mounted/mercury thermostatic/liquid level float switch |
IC/SM alarm switch board |
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what is used to verify alarm circuits are de energized when you start to T/S |
multimeter |
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what is the water switch used to detect |
activation of the magazine sprinkler system as well as any water in piping |
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is sprinkler protection required for pyrotechnics that aresalt water actuated |
NO
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acts as a conductor shorting the two button contacts and activating the alarm in a water switch |
switch casing
|
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what are the most common faults associated with the water switch
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improper maintenance procedure including pinched wires and broken terminal lugs
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causes contacts to deteriorate with exposure
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saltwater connections |
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what is the switch designation for the thermostatic switch |
IC/N |
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what is the mechanically actuated thermostatic switch also known as |
temperature switch |
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is a thermostatic switch only used in high temperature alarm systems |
NO |
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what is the switch designation of the mercury thermostatic switch |
IC/J |
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which switch detects a rise in temperature |
mercury thermostat switch |
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type of tube for a mercury thermostatic switch |
Glass tube |
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number of ocntacts that are in the sensing element of a mercury thermostatic switch |
3 |
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where is the 7k ohm resistor placed in the sensing element of the mercury thermostatic switch |
between the 2nd and 3rd contacts
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Red mercury thermostatic switch
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105 degrees F, Magazine |
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Blue mercury thermostatic switch |
150 degrees F, messdecks, office, berthing |
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Black mercury thermostatic switch |
125 degrees F, store rooms and paint lockers |
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what is an IC/RL |
liquid Level float switch used for water |
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what is an IC/RH |
liquid level float switch used for oil. reversible float included |
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what are the components of an alarm panel
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bells and buzzers, fuses, grounding equip testing equip |
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what must you do when working inside an alarm switchboard |
secure and tag out power |
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how are pressure switch activated
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change in the pressure or vacuum of a gas orliquid |
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what is the switch designation of a pressure switch |
IC/L |
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how is the pressure switch operated |
by the bellows working against an adjustment spring |
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what closes the switch contats when the operating pressure falls below a specified value, activating the alarm |
the spring |
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can pressure switches by used in both high and low pressure systems |
YES |
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three most commonly used pressure gauges |
0 to 15 psi/ 15 to 50 psi/ 50 to 100 psi |
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what situations would you need to tag out the alarm circuit switch for a pressure or thermostatic switch
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when troubleshooting, repairing and replacement |
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what situations would you need to tag out the associated equipment for a pressure or thermostatic switch |
replacement |
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what is used to make switch adjustments during troubleshooting a pressure of thermostatic switch |
the high adjustment screw on side of switch |
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what would you do if the switch does not close even after making adjustments with the higher adjustment screw
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replace the switch |
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what is a burnishing tool used for |
cleaning switch contacts |
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after replacing a pressure or thermostatic switch, how many tests should be conducted to ensure the switch opens and closes at the right set point |
several |
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which mechanical switch is referred to as tamper proof |
IC/DM door mounted switch |
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Circuit TD |
liquid level alarm |
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Circuit HF |
air flow indicator and alarm |
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Circuit FZ |
high security alarm |
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Circuit FH |
magazine sprinkling alarm |
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Circuit FD |
flooding alarm |
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Circuit F |
Fire alarm (high temp alarm) |
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Circuit DL |
Intrusion (secure communications space door alarm |