Questions and Answers
What are alarm sirens rated in?
Wattage and decibel output
What is the range of the supervising current in a Class B fire alarm circuit?
Milliampere
Modern alarm systems may utilize window screens which will provide alarm protection with the window open. This method utilizes a screen that has fine insulated wires running through it in parallel paths about __________ to __________ cm apart.
5 to 7
What does a Class B detection circuit in a fire alarm system contain?
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There are normally four conditions to be considered in a fire alarm system. They are a normal condition, a manual pullstation condition, a trouble condition, and a supervisory condition.
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What condition is created when a short circuit occurs across the conductors in a Class B signal circuit?
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Which type of smoke alarm is the best type to install in a residence?
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What is the voltage of the signal through the traveller conductor putting other smoke alarms into the alarm status?
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What does a microwave motion detector measure?
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What condition is created when a short circuit occurs across the conductors in a Class B detection circuit?
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What does a Class B signal circuit in a fire alarm system contain?
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Any time that a terminal or splice is opened and the supervisory current of an alarm system is interrupted, the alarm will be activated and an alarm condition will be indicated at the control panel.
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Output devices for a basic residential alarm system include?
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What is one of the major causes of false alarms in regards to motion detectors?
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Earlier models of motion detectors were developed with principles similar to?
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Passive Infrared Detectors sense changes in?
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A basic fire alarm system must contain at least _______ components.
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Rollerball contacts are more or less expensive to produce over magnetic reed switches?
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Which Code states that smoke alarms must be installed in residential units?
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How can each area of protection (zone) of an alarm system be programmed?
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Which of the following is an advantage of a photoelectric smoke alarm?
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If there is an open in the conductors of a Class B signal circuit, what condition will the fire alarm system be in?
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A residential security alarm system is normally a __________ circuit.
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The Class B circuit is one continuous path connecting all field devices together and terminating with what type of device?
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Which of the following devices would be considered an internal intrusion sensing device?
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Generally, what is the purpose of strobe lights when utilized as part of a security system?
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Where does a Security System Central Processing Unit, under normal conditions, receive its electrical power?
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Match the 4 conditions of a fire alarm system:
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Intrusion sensing devices are divided into what two categories?
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What is a magnetic reed switch?
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Magnetic reed switches have a life cycle of up to __________ operations.
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What is generally used for sealed windows where entry to the frame is restricted?
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What are used for doors and higher security areas to make contact tampering less likely?
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Glass break detectors work off the principles of?
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An acoustic sound pattern detector or shatter switch should be mounted?
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Dual technology and shock wave detectors combine what two methods?
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PIRs are also known as?
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How is the CPU of a residential alarm programmed?
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A normally open loop goes into an alarm when a contact?
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A CPU requires a ____v battery to maintain power during an outage.
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Sirens are often installed in?
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Residential alarms typically operate at a nominal voltage from __________ to __________.
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What is a stand alone, battery operated, and electrically connected device?
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The most common type of smoke alarm is an?
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A basic fire alarm system must contain what components?
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Field devices can be separated into what two categories?
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Study Notes
Alarm Systems Overview
- Alarm sirens are rated in wattage and decibel output.
- Class B fire alarm circuits provide electrical supervision with a continuous supervisory current, typically ranging from 20 to 60 milliamperes.
- Modern alarm systems may utilize window screens with insulated wires running in parallel paths approximately 5 to 7 cm apart.
Fire Alarm System Components
- A Class B detection circuit in a fire alarm system contains smoke detectors and alarms.
- A basic fire alarm system must consist of at least three components: the fire alarm control panel, a manual pull station, and an audible signal device.
- Output devices in a basic residential alarm system include strobe lights and sirens.
Alarm System Conditions
- Fire alarm systems consider four primary conditions: Normal, Trouble, Alarm, and Supervisory.
- A short circuit in a Class B signal circuit leads to a Trouble condition, while a short circuit in a Class B detection circuit results in an Alarm condition.
Motion and Smoke Detectors
- Microwave motion detectors measure movement utilizing radar technology.
- Passive Infrared Detectors (PIRs) sense changes in heat emitted by objects.
- Different types of smoke alarms include photoelectric smoke alarms, which respond faster to smoldering fires and are recommended for residential use.
Circuit Types and Specifications
- Residential security alarm systems typically operate on Class 2 circuits.
- Supervision current interruptions in circuits can trigger alarm conditions at control panels.
- Class B circuits connect all field devices in a continuous path ending with an end-of-line device.
Device Functions and Performance
- Magnetic reed switches operate with a lifecycle of up to ten million operations and consist of a long metal reed pulled by magnetic force.
- Surface mount contacts are used for sealed windows, while recessed contacts are preferred for doors to reduce tampering risk.
- Glass break detectors operate based on acoustic shock waves and sound patterns.
Power and Programming
- A Security System Central Processing Unit (CPU) normally draws power from an AC supply.
- During power outages, a CPU requires a 12v battery to maintain operation.
- The alarm CPU can be programmed via a keypad.
Operational Considerations
- Improper installation is a significant cause of false alarms in motion detectors.
- Strobe lights are used to call attention to activated alarms, enhancing visibility during security events.
- Residential alarms typically operate at a nominal voltage ranging from 6 volts to 12 volts.
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Description
Test your knowledge on alarm systems and their critical components. This quiz covers essential concepts like Class B fire alarm circuits, system conditions, and the vital elements of a basic fire alarm setup. Perfect for those studying fire safety and alarm technology.
